个人简介

Ph.D. 1974, University of Chicago

研究领域

Dynamical studies of low energy ion-molecule reactions in the gas phase/imaging studies of collisions/photochemistry of size-selected ionic clusters.

Professor Farrar and his research group focus their interests on the reaction dynamics and photochemistry of ionic species. The objective of this research is to elucidate the reactivity of gas phase species important in electrical discharges, reactive ion etching, atmospheric and interstellar chemistry, and planetary atmospheres. The research also focuses on understanding processes involved in the transition from the gas phase to the condensed phases, as probed spectroscopically through size-dependent properties of mass-selected cluster ions. The research employs the techniques of mass spectrometry, laser spectroscopy, molecular beams, and computation. The principal interest of the group is the application of the crossed beam method to studies of low energy ion-molecule reactions. Our research is based on velocity map imaging methods for reconstructing product velocity space distributions by taking a snapshot of the spatial distribution in a particular time window. The locus of points of reaction products with a constant center of mass speed is a sphere whose radius increases with time. Imaging the set of nested spheres describing the reaction products by projecting them on a plane allows all product velocity elements to be observed in a single time window. The schematic diagram in Figure 1 indicates the important elements of the imaging method as implemented in our laboratory.

近期论文

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Pei, L., Farrar, J. M. "Imaging Ion-Molecule Reactions: Charge Transfer and Halide Transfer Reactions of O+ with CH3Cl, CH3Br, and CH3I," Int. J. Mass Spectrom. 2014, http://dx.doi.org/10.1016/j.ijms.2014.07.007. Falcinelli, S., Rosi, M., Candori, P., Vecchiocattivi, F., Farrar, J. M., Pirani, F., Balucani, N., Alagia, M., Richter, R., Stranges, S. "Kinetic Energy Release in Molecular Dication Fragmentation after VUV Ionization and Escape from Planetary Atmospheres," Planetary Space Science 2014, 99, 149-157. Farrar, J. M. "Historical perspective on: Neon interatomic potentials from scattering data and crystalline properties," Chem. Phys. Lett. 2013, [Chem. Phys. Lett. Volume 19, Issue 3, 1 April 1973, Pages 359-362] 589, 12-13. Pei, L., Farrar, J. M. "Ion Imaging Study of Dissociative Charge Transfer in the N2+ + CH4 system," J. Chem. Phys. 2013, 138, 124304. Pei, L., Farrar, J. M. "Ion Imaging Study of Reaction Dynamics in the N+ + CH4 system," J. Chem. Phys. 2012, 137, 154312. Pei, L., Farrar, J. M. "Imaging Ion-Molecule Reactions: Charge Transfer and C-N Bond-Formation in the C+ + NH3 system," J. Chem. Phys. 2012, 136, 204305. Editor's Choice for 2012. Li, Y., Liu, L., Farrar, J. M. "Vibrational-Rotational Energy Distributions in the Reaction O- + D2 → OD + D-," J. Phys. Chem. A 2009, 113, 15233-15239. Liu, L., Li, Y., Farrar, J. M. "Singlet and Triplet State Dynamics of Charge and Hydride Transfer Reactions of OD+ (X 3Σ-) with Propyne," Int. J. Mass Spectrom. 2009, 280, 154-161.