Accession Number : AD0760727

Title :   Time-of-Flight Spectroscopy of CO2 Photodissociation in the Vacuum Ultraviolet. Electron Emission from Cesium Surface by Metastable Singlet Oxygen Atoms,

Corporate Author : YORK UNIV TORONTO (ONTARIO) CENTRE FOR RESEARCH IN EXPERIMENTAL SPACE SCIENCE

Personal Author(s) : Welge,K. H. ; Gilpin,R.

Report Date : 17 DEC 1970

Pagination or Media Count : 5

Abstract : Time-of flight spectroscopy has been employed in conjunction with metastable photofragment detection by electron emission from metal surfaces to study the photodissociation of CO2 in the vacuum ultraviolet at wavelengths longer than 1050 A. Irradiation was performed by unfiltered light. However, some wavelength selection was provided by the CO2 absorption itself and by choice of window material, LiF and CaF2. The metastable detector was coated with cesium. The photodissociation, CO2 + hv-gields CO(X singlet Sigma) + O*, has been observed. The result implies that the deactivation of metastable singlet oxygen atoms at a cesium surface produces electron emission. The analysis of the flight time distribution of O* shows that in the wavelength range from about 1160-1050 A more than 50% of the dissociation leads to internally exicted CO(X singlet Sigma) with considerable amounts of vibration-rotation energy. (Modified author abstract)

Descriptors :   (*CARBON DIOXIDE, *PHOTOLYSIS), ULTRAVIOLET RADIATION, CARBON MONOXIDE, OXYGEN, ATOMS, CANADA

Subject Categories : Radiation and Nuclear Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE