Accession Number : ADA338924

Title :   State Resolved Dynamics of Ion-Molecule Processes

Descriptive Note : Final rept. 1 Nov 94-31 Oct 97

Corporate Author : COLORADO UNIV AT BOULDER

Personal Author(s) : Leone, Stephen R. ; Bierbaum, Veronica M.

PDF Url : ADA338924

Report Date : 16 FEB 1998

Pagination or Media Count : 18

Abstract : Flow-drift and selected ion flow tube techniques have been coupled with laser induced fluorescence detection to explore the chemistry and dynamics of gas phase ion molecule interactions. The charge transfer and atom abstraction rates of vibrationally excited ions have been studied, as well as the competition between deactivation and reaction. The reactions and energy transfer of the vibrationally excited molecular nitrogen cation with the rare gases and several diatomic molecules were explored in detail, and dramatic effects of vibrational enhancement were observed. The mobilities of atmospheric cluster ions were measured using the selected ion flow tube technique. Detailed systematizations of the results were made for both nonpolar and highly polar collision partners. Velocity-resolved measurements were made using a single frequency dye laser. It was determined that the rotational alignment resulting from the collisions of the nitrogen molecular cation, in its ground vibrational state, with helium at elevated kinetic energies is a dramatic function of the velocity subgroup probed.

Descriptors :   *REACTION KINETICS, *ATMOSPHERIC CHEMISTRY, *ION MOLECULE INTERACTIONS, VIBRATION, LASER INDUCED FLUORESCENCE, ENERGY TRANSFER, CLUSTERING, KINETIC ENERGY, CHARGE TRANSFER, DIATOMIC MOLECULES, ROTATION, PARTICLE COLLISIONS, RARE GASES.

Subject Categories : Atmospheric Physics
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE