Accession Number:

ADA214110

Title:

Sub-Picosecond Laser Studies of Excited State Dynamics

Descriptive Note:

Final rept. Aug 1986-Aug 1989

Corporate Author:

IBM FEDERAL SYSTEMS DIV YORKTOWN HEIGHTS NY

Report Date:

1989-10-06

Pagination or Media Count:

40.0

Abstract:

Apparatus for performing femtosecond transition-state absorption spectroscopy has been developed. The UV pump pulses rely upon amplification of femtosecond pulses in excimers. The probe pulses rely upon gas-phase continuum generation. Femtosecond transition-state absorption spectroscopy has been performed on Thallium, Sodium and Bismuth atoms produced by the 308-nm and 248- nm photodissociation of various gas-phase molecules, and also on CN radicals produced by UV photolysis of ICN. In the case of T1 and Bi, the transient spectra are all clearly identifiable as atomic, yet they display striking asymmetries in line shapes and enhancements in intensity that clearly demonstrate that they are spectral signatures of atoms still in the force fields of their receding partners. A new area of spectroscopy has thus been defined. Keywords Diazahicyclooctane. aw

Subject Categories:

  • Physical Chemistry
  • Radiation and Nuclear Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE