Accession Number : AD0696664

Title :   FLUORESCENCE EFFICIENCIES AND COLLISIONAL DEACTIVATION RATES FROM N2 AND N2(+) BANDS, EXCITED FROM DEPOSITION OF SOFT X RAYS,

Corporate Author : LOS ALAMOS SCIENTIFIC LAB N MEX

Personal Author(s) : Mitchell,Kenneth B.

Report Date : 03 NOV 1969

Pagination or Media Count : 14

Abstract : Efficiencies for excitation of the 3914-A N2(+) first negative band and several prominent N2 second positive bands were measured in pure nitrogen and nitrogen-oxygen mixtures as a function of gas pressure. These nitrogen bands were excited by the deposition of monochromatic x rays in the energy range from 0.9 to 8.0 keV. The efficiency for the 3914-A band in air, at pressures where there is no deactivation, was determined to be 0.53%. and that for the 3371-A second positive band was 0.21%. The efficiencies of these bands were invariant for photon energies between 0.9 and 8.0 keV. The deactivation of the 3914-A band in pure nitrogen follows the Stern-Volmer relationship for two-body processes. Three-body processes are evident in air at pressures above 100 Torr. The quenching constant K in 1/Torr was measured for a variety of first positive bands for the sequences v' = 1 to 7. These K values, averaged over all v' sequences, were about 3 for nitrogen and 6.5 for air. The first positive bands are deactivated at a rate of 6.5 times the 3914-A band (K = 1.08/Torr) in air. (Author)

Descriptors :   (*NITROGEN, *FLUORESCENCE), (*NUCLEAR EXPLOSIONS, MEASUREMENT), (*X RAY SPECTROSCOPY, NITROGEN), ELECTRON TRANSITIONS, MOLECULAR ENERGY LEVELS, ULTRAVIOLET SPECTRA, VISIBLE SPECTRA

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE