Accession Number : ADA331493

Title :   Photo-Initiated Ion-Molecular Reactions in Size-Selected Clusters.

Descriptive Note : Final rept. 1 Jul 94-30 Nov 96,

Corporate Author : CALIFORNIA UNIV BERKELEY DEPT OF CHEMISTRY

Personal Author(s) : Neumark, Daniel M.

PDF Url : ADA331493

Report Date : 30 NOV 1996

Pagination or Media Count : 3

Abstract : During the grant period, this work has focused on two research areas: zero electron kinetic energy (ZEKE) spectroscopy experiments on mass-selected cluster anions in which a halide ion (C1 or I) is solvated with a known number of rare gas atoms, and stimulated Raman pumping of negative ions. Negative ion ZEKE spectroscopy is a high resolution laser photodetachment experiment which yields information on the vibrational and electronic spectroscopy of both the anion cluster and the neutral species formed by photodetachment. By performing this experiment on a series of clusters (ArnI, for example), one learns how the stepwise solvation of the halide ion affects the anion and neutral energetics and spectroscopy. We have measured ZEKE spectra of ArnC1, ArnBr, ArnI, and XenI clusters. In all cases, we obtain high quality intermolecular potentials for the diatomic neutral and anionic (i.e. n=1) clusters, and learn about the how the spin-orbit levels of the neutral halogen atom are perturbed by the rare gas atom. We have also performed stimulated Raman pumping in C2, the first such observation for a molecular negative ion.

Descriptors :   *PHOTOCHEMICAL REACTIONS, *CHEMICAL DISSOCIATION, *RAMAN SPECTROSCOPY, OUTPUT, IONS, MOLECULES, ATOMS, CLUSTERING, KINETIC ENERGY, HALIDES, MOLECULE MOLECULE INTERACTIONS, SOLVATION, ENERGETIC PROPERTIES, ELECTRON SPECTROSCOPY, ANIONS, HALOGENS, RARE GASES, VIBRATIONAL SPECTRA.

Subject Categories : Inorganic Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE