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Chemical Dynamics Beamline Director
Lawrence Berkeley National Laboratory
One Cyclotron Road, BLDG 2R0300
Berkeley, CA 94720-8198
USA
Professor of Chemistry
University of California, Berkeley
Department of Chemistry
402 Latimer Hall
Berkeley, CA 94720-1460
USA
Chemical Physics Program
Chemical Dynamics Beamline
Biography
Professor, Born 1948; B.A. Northwestern University, 1970;
Ph. D., Physical Chemistry, University of California, Berkeley,
1974; Alfred P. Sloan Fellow, 1977-81; Department of Commerce
Silver Medal Award (1980); American Chemical Society Pure
Chemistry Award (1982); American Chemical Society Nobel Laureate
Signature Award for Graduate Education in Chemistry, jointly
with D.J. Nesbitt and J.T. Hynes, 1983; Coblentz Award for
Spectroscopy, 1984; Department of Commerce Gold Medal Award,
1984; Arthur S. Flemming Award for Government Service, 1986;
Fellowship, Japanese Society for the Promotion of Science,
1986; John Simon Guggenheim Fellow, 1988; Herbert P. Broida
Prize of the American Physical Society, 1989; Visiting Miller
Research Professor to the University of California, Berkeley,
1990; Visiting Professor at the Chemistry Research Promotion
Center, Taiwan, 1992; Samuel Wesley Stratton Award from the
National Institute of Standards and Technology, 1992; Bourke
Medal of the Faraday Division of the Royal Society of Chemistry,
1995; Fellow, American Physical Society, Optical Society of
America, and American Association for the Advancement of Science;
Member of the National Academy of Sciences, 1995; Centennial
Speaker, American Physical Society, 1999; and Fellow of the
American Academy of Arts and Sciences, 2000.
Research Interests
Research projects are grouped along three main themes: Ultrafast
laser molecular dynamics, including wave packets, phase control,
and quantum information; State-resolved chemical dynamics
of neutrals and ions; Nanostructured materials investigations
with scanned probe microscopies. Projects include: photofragmentation
and radical-radical reactions by time-resolved Fourier transform
infrared emission, low temperature reaction rates for the
chemistry of Saturn and Titan, neutral radical products of
ion reactions, ultrafast Rydberg wave packet dynamics, femtosecond
laser molecular wave packet dynamics and quantum information,
ultrafast soft x-ray, time-resolved x-ray photoelectron dynamics,
surface/semiconductor growth and processing, ultrafast near
field optical microscopy of semiconductors and nanowires,
infrared near field microscopy of polymer photoresists, epitaxial
nanodot growth, vapor uptake and diffusion in polymers.
Several examples are considered briefly. Ultrafast lasers
are used to probe the dynamics of molecular motion on the
time scale of vibrational and rotational periods, and the
separate motions can be arranged into qubits for controlled
quantum information algorithms. The Leone group investigates
coherent control properties by assembly of wave packets with
varying amplitudes and phases of states. These investigations
are being extended to Rydberg wave packets of atoms, molecules,
and quantum information, where the electronic degree of freedom
can be separated from the rotation and vibration of the molecular
core to study important internal dynamics. Wave packet dynamics
will be extended in other new projects to multidimensional
polyatomic molecule potential energy surfaces. The study of
molecular photodissociation by laser techniques has opened
the way to analyze the simple breaking of a molecular bonds
in great detail. In other investigations novel five-member
ring transition states and radical-radical reactions that
do not proceed over formal transition states are investigated.
Research explores the ultralow temperature gas phase kinetics
for the atmospheres of Titan and Saturn. The study of ion-molecule
reaction dynamics by high-resolution laser techniques has
also been pioneered in this group. New experiments are designed
to probe the neutral radical products of ion reactions and
to study time-resolved x-ray photoelectron spectroscopy using
ultrafast laser higher harmonic generation for the first time.
Surface semiconductor processes, including epitaxial growth
of materials, is another rich area of investigation. The formation
of germanium nanodots on silicon is studied using atomic force
microscopy. In situ microscopies will be employed in the growth
of InGaN materials, with spontaneous formation of InN quantum
dots. New experiments are being explored in time-resolved
near field optical microscopy and infrared near field microscopy,
for example, to probe photolithographic polymer films with
chemical band specificity and to study ultrafast laser excitation
of nanowire materials. Other new projects will be developed
to study aerosol spectroscopy and kinetics using the chemical
dynamics beamline at the Advanced Light Source.
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