Accession Number:

AD0731978

Title:

Triatomic Photofragment Spectra: II. Angular Distributions from NO2 Photodissociation,

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

1971-08-13

Pagination or Media Count:

70.0

Abstract:

The angular distribution of recoil of O atoms from the photodissociation of NO2 at 28,810cm is presented and analyzed to obtain information about the lifetime and symmetry of the excited dissociative state. The theoretical effects on photofragment angular distributions of excited state symmetry, lifetime, angular momentum, and angular recoil distribution with respect to internal coordinates are considered. The actual angular distribution measured by photofragment spectroscopy, peaks in the direction of the electric vector of the light, indicating that the predominant upper state is of doublet B2 symmetry. Some adsorption leading to states of different symmetry cannot be excluded. An upper limit for the lifetime of the excited NO2 molecule before dissociation is about 2 x 10 to the -13th sec, indicating that breakup is too rapid to be affected by collisions in the atmosphere where NO2 photodissociation is an important step in photochemical air pollution. Author

Subject Categories:

  • Radiation and Nuclear Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE