Accession Number:

ADA169601

Title:

Heterogeneous Catalysis with Lasers.

Descriptive Note:

Final rept. 1 Jun 80-31 Aug 86,

Corporate Author:

ROCHESTER UNIV NY DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

1986-06-01

Pagination or Media Count:

14.0

Abstract:

Theoretical techniques have been developed to describe a variety of laser-induced molecular rate processes occurring at solid surfaces which are involved in heterogeneous catalysis. Such processes include adsorption, migration, chemical reactions and desorption. The role of surface phonons in laser-selective processes and laser heating has been analyzed. The importance of electronic degrees of freedom has been considered for semiconductor and metal substrates, with special emphasis on the laser excitation of surface states. Surface-modified photochemistry has also been investigated, where the effect of a metal surface on the resonance fluorescence spectrum of a laser-driven atommolecule has been assessed by means of surface-dressed optical Bloch equations. It is seen that the spectrum can be significantly different from the gas-phase case. Two related gas-surface collision processes have also been studied. First, the feasibility of the formation of the electron-hole pairs in a semiconductor by vibrationally excited molecules has been explored. Second, charge transfer in ion-surface collisions has been examined for both one-electron and two-electron transfer processes. Work has been initiated on microstructures and rough structures, including clusters and surface gratings. Keywords Energy transfer Quantum optics Reaction kinetics Proton neutralization Ion neutralization Ion formation.

Subject Categories:

  • Physical Chemistry
  • Radiation and Nuclear Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE