Chemical Physics Research in the Compton Group Bob Compton Departments of Physics and Chemistry The University of Tennessee Knoxville, TN Physics 599

Basic Research Opportunities I. Negative Ions Electron Attachment Mulitply-Charged Negative Ions Dipole-Bound Negative Ions Quadrupole-Bound Negative Ions Spectroscopy* III. Chirality Linear and Non-Linear Optical Activity Parity Violating Weak Interaction III. NanoMaterials (STAIR IGERT Grant)

Science Review M. K. Scheller, R. N. Compton, and L. S. Cederbaum, Science, 270, 1160 (1995).

Electron Binding to a Polar Molecule: Dipole Bound Anions  min =1.625 D for fixed or point dipole  min  D for real, rotating molecules

+ + Rb + Rb

Ion Physics at the Arhus Storage Ring

IR-MPD Vibrational Spectroscopy of SF 6 - Assignment of IR-MPD spectra provides foundation for further study: –Suggests O h symmetry structure –Gives spectral region to look for SF 6 - atmospheric absorption feature –Starting point for theoretical treatment of electron capture dynamics

e-e-e-e- e-e-e-e- Multiply-charged Negative Ions

A schematic view of a linear electrospray ionization coupled to three quadrupole mass spectrometers. Q1 and Q2 are the first and second quadrupole mass spectrometers respectively. D1 and D1 are the electron multiplier detectors. CC is the collision cell containing a quadrupole ion guide q.

Collision Energy (com) Relative intensity (arb. Units) + + +

IR Spectroscopy of a gas phase dianion ! Theory and Experiment

Two plus one Resonance Enhanced Multiphoton Ionization, (2+1) REMPI, Spectroscopy of ( R )- 3-methylcyclopentanone

Colleagues: S. Hager, S. Ovchinnikov, J. Macek, W.R. Garrett, and R. J. Hinde (UT), C. Desfrancois and Jean-Pierre Schermann (U. Paris-Nord), Kit Bowen (Johns Hopkins), K. Jordan (Pittsburgh), L. Adamowitz (Arizona), Steen Nielsen et al.(Aarhus) Former Students: Watheq Al’Basheer ( University of Calgary), Andy Fischer (ORNL now Abbot Labs.), Nathan Hammer (Yale/U. Mass now U. Miss.), Nasrin Mirsaleh- Kohan (U. Sherbrooke), Shaun Ard (U. Georgia), Jeff Steill (Univ. of Utrech, FELIX), Maria Olivarus Present Students; Jason Lambert, Patrick Ward

Nathan I. Hammer, PhD Assistant Professor of Physical Chemistry Department of Chemistry & Biochemistry The University of Mississippi Education Honors B.S. in Chemistry (1998, University of Tennessee) Ph.D. in Physical Chemistry (2003, University of Tennessee) Postdoctoral Researcher ( , Yale University) Postdoctoral Fellow ( , University of Massachusetts) Nathan I. Hammer, PhD Assistant Professor of Physical Chemistry Department of Chemistry & Biochemistry The University of Mississippi Education Honors B.S. in Chemistry (1998, University of Tennessee) Ph.D. in Physical Chemistry (2003, University of Tennessee) Postdoctoral Researcher ( , Yale University) Postdoctoral Fellow ( , University of Massachusetts) Nathan I. Hammer, PhD Assistant Professor of Physical Chemistry Department of Chemistry & Biochemistry The University of Mississippi Education Honors B.S. in Chemistry (1998, University of Tennessee) Ph.D. in Physical Chemistry (2003, University of Tennessee) Postdoctoral Researcher ( , Yale University) Postdoctoral Fellow ( , University of Massachusetts)