Accession Number:

ADA009401

Title:

Single Vibronic Level Photochemistry of Formaldehyde (H2CO singlet A2): I. Radiative and Non-Radiative Transitions.

Descriptive Note:

Final rept. 1 Apr 74-31 Mar 75,

Corporate Author:

CALIFORNIA UNIV IRVINE DEPT OF CHEMISTRY

Personal Author(s):

• Miller,Richard G.
• Lee,Edward K. C.

Report Date:

1975-04-25

Pagination or Media Count:

15.0

Abstract:

Fluorescence decay times and fluorescence emission quantum yields from various single vibronic levels of the first excited singlet state of H2CO singlet A2 have been measured. Radiative and non-radiative lifetimes of the single vibronic levels have been determined. The stronger promoting vibrational mode for the radiative transition is the asymmetric stretch mode rather than the out-of-plane bending mode. The latter mode, however, is a promoting mode for the non-radiative transition. As much as a factor of 40 variation in the radiative lifetime values is observed for the variety of vibrational states studied.

Descriptors:

• *FLUORESCENCE
• *EMISSION SPECTRA
• *FORMALDEHYDE
• MOLECULAR VIBRATION
• EXCITATION
• QUANTUM EFFICIENCY
• ELECTRON TRANSITIONS
• SPECTRUM ANALYSIS
• MOLECULAR ENERGY LEVELS
• ULTRAVIOLET SPECTRA

Subject Categories:

• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE