I
was born in Akron, Ohio on June 6, 1943, one year to the day before D-Day, the
allied invasion at Normandy. The youngest of four children, I was brought up
in a wonderfully stable, loving family of strong Midwestern values. When I was
three my family moved to Kansas City, Missouri where we lived in a beautiful
large home in a lovely upper-middle class neighborhood. I grew up there (at
least to the extent one can be considered to be grown up on leaving for college
at age 18) and was convinced that Kansas City, Missouri was the exact center
of the known universe.
My mother, Esther Virginia Rhoads, was the third of six children of Charlotte
Kraft and Errett Stanley Rhoads, a wealthy manufacturer of furniture in the
Kansas City area. She liked the unusual name Errett so much that she gave it
to me as my middle name. She picked the name Richard after the crusading English
king (the Lion-Hearted), but being a good American and suitably suspicious of
royalty, she was fond of calling me "Mr. President" instead. She had big plans
for me, and loved me beyond all reason.
My father, Frank Dudley Smalley, Jr., was the second of four children born to
Mary Rice Burkholder and Frank Dudley Smalley (Sr.), a railroad mail clerk in
Kansas City. Although my father went by the name of June (short for Junior),
he never quite forgave his father for not having given him a name of his own,
and for not having aspired to more in life. My father started work as a carpenter,
and then as a printer's devil, working for the local newspaper, The Kansas
City Star, and later for a farm implement trade journal, Implement and
Tractor. By the time he retired in 1963 he had long since risen to be CEO
of this company, and a group of several others that published trade journals
in the booming agriculture industry throughout the Western Hemisphere. He was
incredibly industrious, talented, and fascinated with both business and technology.
He had a wonderfully analytic mind, and loved argument, open discussion, and
homespun philosophy. During the depression in the early 1930's he married my
mother (who fell in love with his blue eyes) and was promptly laid off from
work. The story of his career is one of total dedication to both his work and
his family, a dedication that held steady through a series of tribulatons, many
of which I am only now beginning to appreciate. He loved me too, but he could
see himself in me, and knew my failings through and through. Until late in life
I was never quite good enough for my father, and I suppose that is part of what
drives me even now, well after his death in 1992.
My interest in Science had many roots. Some came from my motner as she finished
her B.A. Degree studies in college while I was in my early teens. She fell in
love with science, particularly as a result of classes on the Foundations of
Physical Science taught by a magnificent mathematics professor at the University
of Kansas City, Dr. Norman N. Royall, Jr. I was infected by this professor second
hand, through hundreds of hours of conversations at my mother's knees. It was
from my mother that I first learned of Archimedes, Leonardo da Vinci, Galileo,
Kepler, Newton, and Darwin. We spent hours together collecting single-celled
organisms from a local pond and watching them with a microscope she had received
as a gift from my father. Mostly we talked and read together. From her I learned
the wonder of ideas and the beauty of Nature (and music, painting, sculpture,
and architecture). From my father I learned to build things, to take them apart,
and to fix mechanical and electrical equipment in general. I spent vast hours
in a woodworking shop he maintained in the basement of our house, building gadgets,
working both with my father and alone, often late into the night. My mother
taught me mechanical drawing so that I could be more systematic in my design
work, and I continued in drafting classes throughout my 4 years in high school.
This play with building, fixing, and designing was my favorite activity throughout
my childhood, and was a wonderful preparation for my later career as an experimentalist
working on the frontiers of chemistry and physics.
The principal impetus for my entering a career in science, however, was the
successful launching of Sputnik in 1957, and the then current belief that science
and technology was going to be where the action was in the coming decades. While
I had been a rather erratic student for many years, I suddenly became very serious
with my education at the beginning of my junior year in the fall of 1959. I
set up a private study in the partly furnished, unheated attic of our home,
and began to spend long hours in solitude studying and reading (and smoking
cigarettes). This happened to be the year when I began to study chemistry for
the first time. Luckily, these years were some of the best ever for the public
school system in Kansas City, and my local high school, Southwest High, was
one of the most effective anywhere in the US as measured by scores on standard
achievement tests, and the fraction of students going on to college. My teacher,
Victor E. Gustafson, was a great inspiration. He had just begun to teach the
preceding year, and was full of love for his subject and for teaching, and had
an as yet unblunted ambition to reach even the slowest of students. In addition,
this was the first class I had ever taken with my sister, Linda, who was a year
older than I, and was a far better student than I had ever been. The result
was that by the end of the year, my sister and I finished with the top two grades
in the class. We hardly ever missed a question on an exam. It was an exhilarating
experience for me, and still ranks as the single most important turning point
in my life, even from my current perspective of nearly four decades later. It
was the proof of an existence theorem. After my junior year, I knew I could
be successful at science. The next year I did equally well in physics with a
wonderful professor, J.C. Edwards, but my soul had already been imprinted by
my exposure to chemistry the year before.
My mother's youngest sibling, Dr. Sara Jane Rhoads, was one of the first women
in the United States to ever reach the rank of full Professor of Chemistry.
After earning her Ph.D. in 1949 with William von Eggers Doering, who was then
at Columbia University, she devoted her life to teaching and research in the
Department of Chemistry of the University of Wyoming. She received the Garvan
Medal of the American Chemical Society in 1982 for her contributions to physical
organic chemistry, particularly in the study of the Cope and Claisen rearrangements.
She was the only scientist in our extended family and was one of the brightest
and, in general, one of the most impressive human beings I have ever met. She
was my hero. I used to call her, lovingly, "The Colossus of Rhoads". Her example
was a major factor that led me to go into chemistry, rather than physics or
engineering. One of the most enjoyable memories of my early life was the summer
(1961) I spent working in her organic chemistry laboratory at the University
of Wyoming. It was at her suggestion that I decided to attend Hope College that
fall in Holland, Michigan. Hope had then (and still has now) one of the finest
undergraduate programs in chemistry in the United States.
At Hope College I spent two years in fruitful study, but decided to transfer
to the University of Michigan in Ann Arborafter my favorite professor, Dr. J.
Harvey Kleinheksel, died of a heart attack, and the organic chemistry professor
with whom I had hoped to do research, Dr. Gerrit Van Zyl, announced his retirement.
While the next two years in Ann Arbor were successful, I had become so entangled
in a stormy love affair with a lovely girl back at Hope College, that I was
not able to concentrate as much on science as I should have. I did, however,
learn a lot. Most of all I learned from my fellow students, and particularly
from John Seely Brown, a graduate student in mathematics who lived in an apartment
down the hall in a small house off campus (he is currently Director of Xerox's
Palo Alto Research Center, PARC). John displayed an audacity of thought and
intellectual ambition that I have rarely seen in any individual. My fellow housemates
and I were infected with the notion that we could master any subject, and at
times we did manage to at least feel that we got close.
By the time of my graduation in 1965, the job market for scientists in the United
States was at an all-time high, and even chemistry graduates with just a BS
degree were in great demand. Rather than proceeding directly to graduate school,
I decided to take a job in the chemical industry in order to buy a bit of time
to see what I really wanted to do in science, and to live a little in the "real"
world. It turned out to be a terrific decision.
In the fall of 1965 I began work full time in Woodbury, New Jersey at a large
polypropylene manufacturing plant owned by the Shell Chemical Company. I began
as a chemist working in the quality control laboratory for the plant, a 24 hour
a day operation that in the mid 60's was quite a wonderland of high technology.
My first boss was a chemist named Donald S. Brath. He taught his young professionals
that "chemists can do anything", and the time I worked under him was a wonderfully
broadening experience. I was teamed up with chemical engineers at the plant
to study problems with the quality of the polymer product. The Ziegler-Natta
catalyst system then in use by Shell to produce isotactic polypropylene was
no where near as efficient as those currently in use, and the level of inorganics
remaining in the polymer was high. Much of what we were concerned with in those
days revolved around this problem of high "ash" content and how it affected
the downstream applications. These were fascinating days, involving huge volumes
of material, serious real-world problems, with large financial consequences.
I loved it.
After two years I moved up to the Plastics Technical Center at the same site
in Woodbury, and devoted myself to developing analytical methods for various
aspects of polyolefins, and of the materials involved in their manufacture,
modification, and processing. Although I found my work at Shell highly enjoyable,
I realized it was time to get on to graduate school, so I began to study seriously
and to send out applications. At the time I was most interested in quantum chemistry,
and received several offers for graduate assistantships in excellent schools.
I was close to accepting an offer from the Theoretical Chemistry Institute at
the University of Wisconsin when the automatic graduate student deferments from
the Draft into the US military were eliminated. This was in early 1968, during
a major buildup phase in the Vietnam War, and I decided it would be more prudent
to remain at Shell for a while since my industrial deferment was still in effect.
In my off hours over the past few years I had met Judith Grace Sampieri, who
was a wonderful young secretary at Shell. We were married on May 4 ot 1968.
Soon thereafter, even the industrial deferment was lost, and we decided that
I might as well reapply for graduate school. Since Judy's family lived in New
Jersey, I decided to apply to Princeton University, and was accepted. In the
late fall of 1968 I was reclassified 1A for the draft and reported to the processing
center in Newark for my physical. At the end of the day I ended up in the group
who had passed. We were told to put our affairs in order since we would soon
be called up. However, in a great stroke of luck, within a week, my wife told
me she was pregnant, and within just a few more weeks my draft board reclassified
me to some status I do not remember, save that it meant I would not be drafted.
On June 9, 1969 Judy and I were blessed with the birth of a beautiful child,
Chad Richard. Later that summer, I held him in my lap as Neil Armstrong first
stepped out onto the Moon.
In the fall of 1969 I moved my new family up to Princeton to begin studies and
research for the Ph.D. in the Department of Chemistry. I was lucky enough to
be in the first group of graduate students to work with Elliot R. Bernstein
who was just starting as an Assistant Professor at Princeton, after having spent
a few years postdoctoral work at the University of Chicago with Clyde A. Hutchison
III, following doctoral training with G. Wilse Robinson at CalTech. Elliot's
research at the time involved detailed optical and microwave spectral probes
of pure and mixed molecular single crystals cooled in liquid helium. I knew
nothing about it at the time I joined the group. I was certain that it was going
to be both experimentally and theoretically complex and challenging, but it
seemed likely to be worth the effort. My research project was the detailed study
of 1,3,5-triazine, a heterocyclic benzene analog that we expected would provide
a poignant testing ground for theories of the Jahn Teller effect. In the end
we found that the crystal field surrounding each molecule was insufficiently
symmetrical to provide the tests we originally sought, but much was learned.
Most importantly from my standpoint, I learned from Elliot Bernstein a penetrating,
intense style of research that I had never known before, and I learned a great
deal about the chemical physics of condensed phase and molecular systems.
In the summer of 1973 we moved to the south side of Chicago so I could begin
a postdoctoral period with Donald H. Levy at the University of Chicago. Levy
had studied gas-phase magnetic resonance with Alan Carrington, and had been
doing some of the most impressive research anywhere in the world with microwave/optical
double resonance and the Hanle effect on NO2 and other open-shell
small molecules. These were the earliest days when tunable dye lasers were beginning
to transform molecular spectroscopy, and Levy's group was in the lead. The optical
spectrum of NO2 was the most troublesome problem for molecular spectroscopists.
Even though it had only three atoms, the visible spectrum had far more structure
than anyone could understand. But since NO2 was readily available
and it displayed an extensive absorption spectrum just where the new lasers
could readily operate (500-640 nm), it was a favorite object for study. Don
Levy and one of his students, Richard Solarz, had made some major advances with
NO2 earlier that summer, so after I arrived in Chicago I began to
consider what I could do next. My biggest problem was that my training at Princeton
had been in condensed matter spectroscopy, and the ultrahigh resolution gas-phase
spectral techniques being used by the Levy group were going to take months to
understand. The detailed physics of rotating polyatomic molecules with spin
is extremely complex. I was familiar only with the physics of molecules frozen
still in a crystal lattice near absolute zero.
When we first arrived in Chicago, Don Levy was in Germany for a several month-long
visit, so I had an opportunity to do some extended reading and to prepare for
the final oral exam for the Ph.D. degree back in Princeton. At that time in
the Chemistry Department at Princeton, the final oral exam consisted of a defense
of three original research proposals. I spent many hours in the Univ. Chicago
chemistry department library reading recent journal articles, searching for
possible topics for these research proposals. On one day I read a new paper
by Yuan Lee and Stuart Rice on the crossed beam reaction of fluorine with benzene
(J. Chem. Phys. 59, 1427 (1973)] in one of Yuan's "universal"
molecular beam apparatuses. It was the sort of experiment that was to lead to
Yuan Lee sharing the Nobel Prize in 1986 with John Polanyi and Dudley Herschbach.
I was deeply struck by a passage in the paper which said that the supersonic
expansion used to make the benzene molecular beam was strong enough to cool
out essentially all rotational degrees of freedom. That was just what I needed.
Since I didn't understand rotating molecules yet, perhaps I could just stop
them from rotating in the first place!
As a result of this exciting day in the Chicago library, one of the proposals
I presented to the Princeton Ph.D. committee later that fall was to use a supersonic
expansion to cool NO2 to the point that only a single rotational
state was populated, and then to use a tunable dye laser to study the now greatly
simplified spectrum. I had found in further reading that the current supersonic
expansion techniques actually would not get cold enough, so I added the further
use of an electric resonance "state-selector" to do a final sorting out of just
a single rotational state for study. I recommended, in fact, that the 10 meter
state-selector beam machine of Lennard Wharton at Chicago could be used.
When Levy returned from Germany, I told him of this proposal, and we discussed
it in some depth. He was intrigued, but was concerned that too much of the NO2
would dimerize to N204 before sufficient cooling was obtained.
A few weeks later we discussed it again, and became sufficiently excited to
walk down the hall and ask Lennard Wharton what he thought. Len lit up like
a light bulb.
Wharton argued that we should first do the experiment on NO2 expanded
in a supersonic free jet, and leave the much more elaborate state-selected experiment
for later. I told him that wouldn't be cold enough - the lowest rotational temperature
reported for a polyatomic molecule in a supersonic beam that I was aware of
at that time was 30 K still way too hot to achieve the simplification we needed.
Wharton smiled wryly and swiveled in his chair to reach a research notebook
from the shelf behind him. After reading a few pages he looked up and asked
"would 3 K be cool enough?". He had already built a liquid hydrogen cryopumped
supersonic beam source with argon, and in the research notebook had measured
data for the velocity distribution showing the translational temperature was
cooled to 3 K. That, I knew from my Ph.D. proposal, would be quite cool enough
in the case of NO2 to collapse the rotational population to just
a few levels. We would simply mix in a percent or so of NO2 into
the argon and make a "seeded" supersonic beam. This would avoid the N204
formation that concerned Don Levy, and may just possibly cool the rotational
degrees of freedom to near the translational temperature of the argon carrier
gas. Thus began the collaboration that led to supersonic beam laser spectroscopy.
On the night of August 8, 1974 (the night Nixon resigned from the US Presidency)
we recorded the first jet cooled spectrum of NO2. The next morning
Don Levy saw the spectrum for the first time, and immediately recognized its
significance. Molecular physics had changed. Now we could study at least small
polyatomic molecules with at the same penetrating level of detail previously
attained only for atoms and diatomics.
A year later, Lennard Wharton came back from a trip to France where he had visited
with Roger Campargue and learned of the concept of the "zone of silence" that
exists in an expanding gas at sufficiently high densities. While this zone is
surrounded by shock waves where the gas is heated to very high temperatures,
within the zone the expanding gas is exactly as cold and unperturbed as it would
be if the gas expanded into a perfect vacuum, forming no shock waves at all.
Campargue had learned to fabricate a ultrasharp edged "skimmer" that could penetrate
the "Mach disc" at end of the zone and transmit the gas streaming along the
center line of the zone of silence to form the most intense, coldest supersonic
beams ever produced. Wharton told Don Levy and me that using helium in such
an apparatus we could easily get cowl to 1 K and perhaps even lower. I was stunned.
I knew that 1 Kwas low enough to freeze out the rotational motion of even medium-sized
molecules such as benzene and naphthalene, and all such molecules could now
be studied without rotational congestion.
Later that same day in a hallway conversation Len Wharton and I realized we
didn't need the skimmer. The probe laser beam could easily penetrate the shock
waves without perturbation, and we could image just the fluorescence from the
laser-excited ultracold molecules in the zone of silence. We quickly built a
new apparatus that incorporated these ideas. With the spectroscopic insight
of Don Levy and with a series of graduate students we published the pioneering
papers on not only jet cooled spectra of ordinary molecules such as NO2,
and tetrazine, but also on the first van der Waals complexes with helium (e.g.
HeI2), and with the vital collaboration of Daniel Auerbach the first
supersonic beam study of a metal atom-rare gas complex, NaAr.
In the summer of 1976 my family and I moved to Houston, Texas where I had accepted
a position as assistant professor in the chemistry department at Rice University.
I knew of Rice principally because of the beautiful laser spectroscopy that
was being done there by Robert F. Curl, and I wanted to collaborate with him
much the same as I had with Don Levy. The first supersonic beam apparatus I
set up was a free jet machine similar to that I had used in Chicago, but adapted
to use pulsed dye lasers in the ultraviolet so that we could study more ordinary
molecules such as benzene. My first proposal to the National Science Foundation
was for a much larger, more ambitious apparatus that would for the first time
use pulsed supersonic nozzles. With these pulsed devices mounted in a large
chamber I expected we could attain a 10-100 fold increase in beam intensity
and cooling, and by synchronizing with the pulsed lasers in both the visible
and ultraviolet be able to study a vast array of large molecules, radicals,
and clusters. Being the second apparatus we constructed, it was called "AP2".
With AP2 we quickly succeeded in setting the world's record for rotational cooling
of a polyatomic molecule (0.17 K). We invented resonant two-photon ionization
(R2PI) with time of flight mass spectrometric detection as a means of probing
the spectrum of molecules in the supersonic beam. We used this to probe the
structure and molecular dynamics of large aromatic molecules, particularly focussing
on the question of intramolecular vibrational redistribution. We also developed
a means of producing fragments of polyatomic molecules (free radicals such as
benzyl and methoxy) by directing a pulsed laser into a specially designed pulsed
supersonic nozzle, and studying these cooled in the supersonic beam.
In the late 1970s in collaboration with Andrew Kaldor and his group at Exxon
we had extended the capabilities of AP2 so that we could study a large uranium
containing molecule (a hexafluoroacetylacetonate-, tetahydrofurancomplexed form
of UO2). These were the days of the oil crisis, when there was widespread belief
that nuclear fission using uranium was going to be the only long-term alternative.
Exxon was working intensely on laser-based isotope separation schemes, and Kaldor
was heading up a group to pursue the molecular route. Our experiment on AP2
ultimately revealed a beautiful sharpening of the infrared multiphoton dissociation
spectrum of this volatile UO2 complex cooled in the supersonic beam,
just what Exxon was looking for. Unfortunately, we began to succeed with these
experiments only after the nuclear release "event" at Three Mile Island on March
28, 1979. Within a year, Exxon made a corporate level decision to get out of
the isotope separation business. But Kaldor had become so impressed with the
capabilities of AP2 that he wanted his own at the corporate laboratories in
Linden in any event. Under contract to Exxon, we developed a smaller version
of the apparatus, and built two versions. One was kept at Rice and lived on
for many years with a very productive science history. Logically, it was called
AP3. The clone of AP3 was shipped to Exxon in late 1982.
After a few years of intensive research we found a way to use a pulsed laser
directed into a nozzle to vaporize any material, allowing for the first time
the atoms of any element in the periodic table to be produced cold in a supersonic
beam. Most importantly, we developed a way to control the clustering of these
atoms to small aggregates, which then were cooled in the supersonic expansion.
Now for the first time it was possible to roam the periodic table and make detailed
study of the properties of nanometer-scale particles consisting of a precise
number of atoms. The field of metal and semiconductor cluster beams was born.
We shipped Exxon this new accessory to their AP3 clone, and both groups then
rapidly began to develop the new field.
As is now well known, the Kaldor group was the first to put carbon in a laser
vaporization cluster beam apparatus, and see the amazing even-numbered distribution
of carbon clusters that we now know to be the fullerenes. Within a year we repeated
the same experiment, but now on an improved version of AP2 that had been modified
for the study of semiconductor clusters. The story of what we discovered on
this apparatus in September of 1985 has been told many times.
The subsequent development of my research in metal and semiconductor clusters,
and the fullerenes is too involved to recount here. Increasingly, the tubular
variant of the fullerenes has dominated our activities. Now our motto is "if
it ain't tubes, we don't do it". We are convinced that major new technologies
will be developed over the coming decades from fullerene tubes, fibers, and
cables, and we are moving as fast as possible to bring this all to life.
Several years ago AP2 was dismantled and sold off in pieces to other research
groups, and the main chamber where the first pulsed nozzle experiments were
performed was sold off to a scrap metal dealer along the Houston Ship Channel.
Now there are no supersonic beam machines of any type in the laboratory. Times
change.
But life and science go on.
From Les Prix Nobel. The Nobel Prizes 1996, Editor Tore Frängsmyr, [Nobel Foundation], Stockholm, 1997
This autobiography/biography was written at the time of the award and later published in the book series Les Prix Nobel/Nobel Lectures. The information is sometimes updated with an addendum submitted by the Laureate. To cite this document, always state the source as shown above.