Events & Seminars > Event Details

Where:

4:00 pm
Room 304, Chemistry Building

Anion Photoelectron Spectroscopy: From radicals and transition states to the reaction co-ordinate

Speaker:

Professor W. Carl Lineberger
University of Colorado

Hosted by: Professors Eric Herbst and John T. Yates, Jr.

Anion photoelectron spectroscopy has proven to be a remarkably tool to obtain fundamental thermochemical information and structural information for stable and transient species. This approach has proven especially useful when coupled with high-level theoretical analyses. I review briefly the experimental methodology and discuss several examples that illustrate the possibilities. These include peroxyl radicals, dichlorocarbene, halomethyl radicals, and diradicals of possible astrochemical relevance. If the anion geometry is appropriate, photodetachment can provide direct information on transition states and geometries along the reaction coordinate of an evolving radical, such as the oxyallyl diradical.1,2

Extension of the methodology to time-resolved anion photoelectron spectroscopy as pioneered by Neumark3 enables following reactive events along a reaction coordinate and elucidating the role of a single solvent molecule in long range electron transfer between atoms.4

*Generously supported by the National Science Foundation and The Air Force Office of Scientific Research.

References:
[1] T. Ichino, S. M. Villano, A. J. Gianola, D. J. Goebbert, L. Velarde, A. Sanov, S. J. Blanksby, X. Zhou, D. A. Hrovat, W. T. Borden, and W. C. Lineberger, Angew. Chem. Int. Ed. Eng. 48, 8509-11 (2009).

[2] T. Ichino, S. M. Villano, A. J. Gianola, D. J. Goebbert, L. Velarde, A. Sanov, S. J. Blanksby, X. Zhou, D. A. Hrovat, W. T. Borden, and W. C. Lineberger, J. Phys. Chem. A 115, 1634-49 (2011).

[3] B. J. Greenblatt, M. T. Zanni, and D. M. Neumark, Science 276, 1675-78 (1997).

[4] L. Sheps, E. M. Miller, S. Horvath, M. A. Thompson, R. Parson, A. B. McCoy, and W. C. Lineberger, Science 328, 220-24 (2010).

William Carl Lineberger his Ph. D. in 1965 from the Georgia Institute of Technology. He joined the University of Colorado Faculty in 1970, where his is the E.U. Condon Professor of Chemistry and Biochemistry and Fellow of JILA. Lineberger’s research centers on the application of lasers to problems in chemical physics, especially those involving gas phase anions.  Particular interests include photoelectron and photodetachment spectroscopy, electron affinities, energetics and structure of transient species, dipole-bound states, metal diatoms and clusters, and ultrafast processes in molecular clusters.  He has published over 250 scientific papers.  He has trained numerous Ph.D. and postdoctoral students who have gone on to be leaders in their fields.

Lineberger has been awarded Sloan, Dreyfus and Guggenheim Fellowships. He has been awarded the H. P. Broida Prize in Chemical Physics, given by the American Physical Society, the Bomem-Michelson Prize, the William F. Meggers Prize from the Optical Society of America, the Earl K. Plyler Prize from the American Physical Society. The American Chemical Society has selected him for their Irving Langmuir Prize in Chemical Physics and the Peter Debye Award in Physical Chemistry. He has served on many advisory committees, chairing the NSF Advisory Committee for Mathematical and Physical Sciences, the National Research Council Commission on Physical Sciences, Mathematics and Applications, and the Department of Energy Basic Energy Sciences Advisory Committee. He has served on the National Research Council Governing Board, the Council of the National Academy of Sciences, and the NAS Committee on Science, Engineering and Public Policy.

Lineberger has been a member of the National Academy of Sciences since 1983 and the American Academy of Arts and Sciences since 1995. In 2011, he was nominated by President Obama for Membership on the National Science Board, subsequently confirmed by the US Senate. On NSB, he serves as a Member of the Executive Committee, the Committee on Program and Plans, and chairs the Subcommittee on Facilities.