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The traditional focus of the lab has been on studies of the transient species, including reactive free radicals and molecular clusters, that play central roles in governing the chemical behavior of complex systems. We characterize these species by using a variety of techniques, including mass spectrometry, photoelectron and photofragment spectroscopies and the measurement of scattering cross-sections. These experiments provide critical tests of modern electronic structure and dynamics calculations, and in the case of three-body dissociation, new types of experimental data on the dynamics of these processes.
Our studies of reactive free-radicals, transition-states and multi-body dissociation dynamics use the photoelectron-photofragment coincidence technique developed here. These experiments are carried out using fast, mass-selected anion beams with short-pulse tunable laser photodetachment. The photoelectron kinetic energy and angle of recoil is measured using imaging techniques, which determines the internal energy in the neutral molecule or cluster under study. If the neutral is unstable and dissociates, then the kinetic energy and angular distributions of the products are recorded using time- and position-sensitive detectors. Analysis of these experiments is carried out in conjunction with ab initio electronic structure, Franck-Condon and dynamics calculations. These techniques are applied to studies of reactive organic intermediates and the dynamics of hydroxyl radical reactions important in combustion and atmospheric processes. Another important research focus has been on decarboxylation dynamics of carboxylate anions and radicals in increasingly complex systems prepared using electrospray ionization.
Our studies of reactive free-radicals, transition-states and multi-body dissociation dynamics use the photoelectron-photofragment coincidence technique developed here. These experiments are carried out using fast, mass-selected anion beams with short-pulse tunable laser photodetachment. The photoelectron kinetic energy and angle of recoil is measured using imaging techniques, which determines the internal energy in the neutral molecule or cluster under study. If the neutral is unstable and dissociates, then the kinetic energy and angular distributions of the products are recorded using time- and position-sensitive detectors. Analysis of these experiments is carried out in conjunction with ab initio electronic structure, Franck-Condon and dynamics calculations. These techniques are applied to studies of reactive organic intermediates and the dynamics of hydroxyl radical reactions important in combustion and atmospheric processes. Another important research focus has been on decarboxylation dynamics of carboxylate anions and radicals in increasingly complex systems prepared using electrospray ionization.
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Papers共 237 篇Author StatisticsCo-AuthorSimilar Experts
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ACS EARTH AND SPACE CHEMISTRYno. 4 (2023): 764-773
JOURNAL OF PHYSICAL CHEMISTRY LETTERSno. 47 (2023): 10677-10684
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETSno. 12 (2023)
JOURNAL OF THE AMERICAN CHEMICAL SOCIETYno. 41 (2023): 22317-22321
Proceedings of the National Academy of Sciences of the United States of Americano. 50 (2023): e2313447120-e2313447120
ACS EARTH AND SPACE CHEMISTRY (2022)
52nd Lunar and Planetary Science Conferencepp.2063, (2021)
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