|05/06/2008 à 11:00
LIDYL Bât 522, p 138 CEA-Saclay
|David T. ANDERSON - Department of Chemistry, University of Wyoming, Laramie, WY 82071-3838, USA
|Reactions of halogen atoms are of interest due to a combination of fundamental and applied reasons. Detailed dynamics studies of gas-phase reactions of halogen atoms with small molecules have explored the importance of shallow van der Waals wells in the entrance channel to reaction, the possibility of non-adiabatic chemistry, and vibrational control of reactions. In this talk, I will present recent studies of halogen atoms (Cl and Br) in solid parahydrogen at liquid helium temperatures that explore the high resolution condensed phase spectroscopy of the dipole forbidden halogen atom spin-orbit transition, weak pre-reactive complexes of the halogen atom (e.g., Br-HBr), and infrared induced tunneling reactions of Cl in solid H2, HD, and D2. The unique properties of low density cryogenic solid hydrogen make it an excellent host to perform high resolution spectroscopy and thus to test theoretical models for condensed phase behavior of halogen atoms with unprecedented rigor.