Leone, Stephen - University of California, Berkeley

个人简介

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; Fellow of the American Academy of Arts and Sciences, 2000; American Chemical Society Peter Debye Award, 2005; Morris Belkin Visiting Professorship, Weizmann Institute of Science, Israel, 2009; JILA Fellow Adjoint, 2006-2011; Morris Belkin Visiting Professorship, Weizmann Institute, 2009; Polanyi Medal of the Gas Kinetics Division of the Royal Society of Chemistry, UK, 2010; Miller Professorship, Miller Research Institute, 2010; National Security Science and Engineering Faculty Fellowship, Department of Defense, 2010

研究领域

Physical Chemistry, Chemical Dynamics and Nanostructured Materials Professor Leone's research interests include ultrafast laser investigations and soft x-ray probing of valence and core levels, attosecond physics and chemistry, state-resolved collision processes and kinetics investigations, nanoparticle fluorescence intermittency, aerosol chemistry and dynamics, probing with near field optical microscopy, and neutrals imaging. Current projects are grouped along several main themes: Ultrafast laser molecular dynamics, including x-ray probing and attosecond pulse production and investigations; chemical dynamics of molecules, nanoparticles, and clusters; nanostructured materials investigations with scanned probe microscopies. Projects include: femtosecond laser dynamics, ultrafast soft x-ray, time-resolved x-ray photoelectron dynamics, attosecond dynamics, near field and ultrafast optical microscopy of semiconductors and nanowires, infrared near field microscopy, photofragmentation and radical-radical reactions, aerosol chemistry, low temperature reactions for the chemistry of Saturn and Titan. Several examples are considered briefly. Ultrafast lasers are used to probe the dynamics of molecular motion on the time scales of vibrational, rotational, or electronic periods. The Leone group investigates coherent properties. The study of molecular photodissociation by soft x-ray laser techniques has opened the way to analyze the simple breaking of a molecular bond in greater detail. High order harmonics are produced by high fields in a rare gas and used to probe valence shell photoelectron spectra and core level spectroscopy of time-evolving systems, ranging from atoms to small molecules to metal clusters. Phase-shaping of the high order harmonics has been investigated. Transient x-ray absorption is used to probe alignment and molecular fragmentation pathways through core level spectroscopy. By using few cycle carrier-envelope phase-stabilized laser pulses, isolated attosecond pulses are generated to study electronic timescales in molecules and clusters by ejecting inner shell electrons on attosecond timescales. An apparatus to probe photoelectron angular images with time-resolved high order harmonics is used to study outgoing electron waves and phases. Research also investigates the ultralow temperature gas phase kinetics for the atmospheres of Titan and Saturn, as well as to probe combustion dynamics through radical reactions. Heterogeneous chemistry is a significant new area of investigation, with applications to fuel droplet combustion and aerosol aging in the atmosphere. Experiments are being explored in confocal microscopy, apertureless near field optical microscopy, and single pulse coherent anti-Stokes Raman microscopy with phase control, and studies involving quantum dot blinking and pump-probe ultrafast studies of semiconductor nanocrystals. Other projects study aerosol light scattering and spectroscopy, aerosol reactions, as well as surface probing of neutrals desorbed by scanning ion microprobes using the chemical dynamics beamline at the Advanced Light Source.

近期论文

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M. Zuerch, H.-T. Chang, P. M. Kraus, S. K. Cushing, L. J. Borja, A. Gandman, C. J. Kaplan, M. H. Oh, J. S. Prell, D. Prendergast, C. D. Pemmaraju, D. M. Neumark, and S. R. Leone, Ultrafast carrier thermalization and trapping in silicon- germanium alloy probed by extreme ultraviolet transient absorption spectroscopy," Struct. Dyn. (submitted) (2017). Z. Wang, B. Chen, P. Dagaut, D. Popolan-Vaida, H. Wang, K. Kohse, S. M. Sarathy, M. A. Raji, N. Hansen, S. Sioud, S. Mohamed, and S. R. Leone, "Unraveling the structure and chemical mechanisms of highly oxygenated intermediates in oxidation of organic compounds," (to be submitted) (2017). S. K. Cushing, M. Zuerch, P. M. Kraus, L. M. Carneiro, H.-T. Chang, C. J. Kaplan, and S. R. Leone, "Simultaneous determination of valley-specific hot carrier and phonon relaxation pathways by transient XUV spectroscopy," Phys. Rev. X (submitted) (2017). S. Chambreau, D. Popolan-Vaida, G. Vaghjiani, and S. R. Leone, "Catalytic decomposition of hydroxylammonium nitrate ionic liquid: enhancement of NO formation," J. Phys. Chem. Lett. 8, 2126 (2017). S. R. Leone, "Attosecond science: from transient absorption to multidimensional spectroscopies," J. Phys. B: Roadmap for Ultrafast X-ray Atomic and Molecular Physics (submitted) (2017). M. F. Jager, C. Ott, P. Kraus, C. J. Kaplan, W. Pouse, R. E. Marvel, R. F. Haglund, D. M. Neumark, and S. R. Leone, "Tracking the insulator-to-metal phase transition in VO2 with few-femtosecond extreme ultraviolet transient absorption," Nat. Comm. (submitted) (2017). L. M. Carneiro, S. K. Cushing, C. Liu, Y. Su, P. Yang, A. P. Alivisatos, and S. R. Leone, "Excitation wavelength dependent small polaron trapping of photoexcited carriers in α-Fe2O3," Nat. Mat. (submitted) (2017). M. Zuerch, H.-T. Chang, L. J. Borja, P. M. Kraus, S. K. Cushing, A. Gandman, C. J. Kaplan, M. H. Oh, J. S. Prell, D. Prendergast, C. D. Pemmaraju, D. M. Neumark, and S. R. Leone, "Direct and simultaneous observation of ultrafast electron and hole dynamics in germanium," ArXiv, 1702.03822 (2017) & Nat. Comm. (accepted manuscript) (2017). E. R. Warrick, J. E. Baekhoj, W. Cao, A. P. Fidler, F. Jensen, L. B. Madsen, S. R. Leone, and D. M. Neumark, "Attosecond transient absorption spectroscopy of molecular nitrogen: vibrational coherences in the b� 1Σ+u state," Chem. Phys. Lett.: Ahmed Zewail Special Issue (in press) (2017). Y. Kobayashi, H. Timmers, M. Sabbar, S. R. Leone, and D. M. Neumark, "Attosecond transient-absorption dynamics of xenon core-excited states in a strong driving field," Phys. Rev. A 95, 031401 (2017). H. Timmers, Y. Kobayashi, K. F. Chang, M. Reduzzi, D. M. Neumark, and S. R. Leone, "Generating high-contrast, near single-cycle waveforms with third-order dispersion compensation," Opt. Lett. 42, 811 (2017). Y.-J. Bae, N. Gibson, T. Ding, A. P. Alivisatos, and S. R. Leone, "Understanding the bias introduced in quantum dot blinking using change point analysis," J. Phys. Chem. C 120, 29484 (2016). A. R. Attar, A. Bhattacherjee, C. D. Pemmaraju, K. Schnorr, K. D. Closser, D. Prendergast, and S. R. Leone, "Femtosecond x-ray spectroscopy of an electrocyclic ring-opening reaction," Science 356, 54 (2017). A. Chatterley, F. Lackner, C. D. Pemmaraju, D. M. Neumark, S. R. Leone, and O. Gessner, "Dissociation dynamics and electronic structures of highly excited ferrocenium ions studied by femtosecond XUV absorption spectroscopy," J. Phys. Chem. A 120, 9509 (2016). W. Cao, E. R. Warrick, A. Fidler, D. M. Neumar, and S. R. Leone, "Noncollinear wave mixing of attosecond XUV and few-cycle optical laser pulses in gas-phase atoms: toward multidimensional spectroscopy involving XUV excitations," Phys. Rev. A 94, 053846 (2016). H.-T. Chang, M. Zuerch, P. M. Kraus, L. J. Borja, D. M. Neumark, and S. R. Leone, "Simultaneous generation of sub-5 femtosecond 400 nm and 800 nm pulses for attosecond extreme ultraviolet pump-probe spectroscopy," Opt. Lett. 41, 5365 (2016). S. R. Leone, and D. M. Neumark, "Attosecond science in atomic, molecular, and condensed matter physics," Faraday Disc. 194, 15 (2016). M. Sabbar, H. Timmers, Y.-J. Chen, A. K. Pymer, Z.-H. Loh, S. G. Sayers, S. Pabst, R. Santra, and S. R. Leone, "State-resolved attosecond reversible and irreversible dynamics in strong optical fields," Nat. Phys. 13 472 (2017). J. Olshansky, A. Balan, X. Fu, T. Ding, Y. Lee, S. R. Leone, and A. P. Alivisatos, "Controlling quantum dot size to access the discrete and continuum limits of electron transfer behavior," ACS Cent. Sci. (submitted) (2016). A. D. Dutoi, and S. R. Leone, "Simulation of x-ray transient absorption for following vibrations in coherently ionized F2 molecules," Chem. Phys. 482, 249264 (2017). S. D. Chambreau, C. J. Koh, D. M. Popolan-Vaida, C. J. Gallegos, J. B. Hooper, D. Bedrov, G. L. Vaghjiani, and S. R. Leone, "Flow-tube investigations of hypergolic reactions of a dicyanamide ionic liquid via tunable vacuum ultraviolet aerosol mass spectrometry," J. Phys. Chem. A 120, 8011 (2016). F. Lackner, A. S. Chatterley, C. D. Pemmaraju, K. D. Closser, D. Prendergast, D. M. Neumark, S. R. Leone, and O. Gessner, "Direct observation of ring-opening dynamics in strong-field ionized selenophene using femtosecond inner-shell absorption spectroscopy," J. Chem. Phys. 145, 234313 (2016). A. S. Chatterley, F. Lackner, D. M. Neumark, S. R. Leone, and O. Gessner, "Tracking dissociation dynamics of strong-field ionized 1,2-dibroethane with femtosecond XUV transient absorption spectroscopy," Phys. Chem. Chem. Phys. 18, 14644 (2016). D. Zhang, Y. Yang, Y. Bekenstein, Y. Yu, N. A. Gibson, A. Wong, S. W. Eaton, N. Kornienko, Q. Kong, M.-L. Lai, A. P. Alivisatos, S. R. Leone, and P. Yang, "Synthesis of composition tunable and highly luminescent cesium lead halide nanowires through anion-exchange reactions," J. Am. Chem. Soc. 138, 7236 (2016). N. Kornienko, N. A. Gibson, H. Zhang, S. W. Eaton, Y. Yu, S. Aloni, S. R. Leone, and P. Yang, "Growth and photoelectrochemical energy conversion of Wurtzite indium phosphide nanowire arrays," ACS Nano 10, 5525 (2016).