Accession Number : AD0652581

Title :   QUENCHING OF THE RESONANCE RADIATION OF SODIUM BY MOLECULAR NITROGEN.

Descriptive Note : Research paper,

Corporate Author : INSTITUTE FOR DEFENSE ANALYSES ARLINGTON VA RESEARCH AND ENGINEERING SUPPORT DIV

Personal Author(s) : Bauer,Ernest

Report Date : DEC 1966

Pagination or Media Count : 42

Abstract : A semiquantitative calculation was made of the cross section for the process Na(3(2)P) + N2(Chi(1)Sigma-G(+); v = 0) to Na(3(2)S) + N2(Chi(1)Sigma-G(+); v = 7,8). To explain the observed cross section, which is of the order of 10 to the -15th power sq cm, it is necessary to postulate an intermediate state which here is ionic in character, involving Na(+) and N2(-); this state is unstable at infinite separation of the atom and molecule, but on account of the Coulomb attraction it becomes stable at separations below approximately 3A. The two transitions into and out of this intermediate state occur by a crossing of potential energy curves. To obtain significant values for the Landau-Zener transition probability it is necessary to invoke a change of 3-4 vibrational quanta in each transition. The discussion of vibrational overlap integrals in a collision extends Nikitin's modification of the Franck-Condon factor. Some discussion of the quenching mechanism for Na(3(2)P) by molecules other than N2 is given in an appendix.

Descriptors :   (*SODIUM, *ATOMIC ENERGY LEVELS), (*NITROGEN, *MOLECULAR ENERGY LEVELS), LUMINESCENCE, QUENCHING(INHIBITION), ELECTRON TRANSITIONS, PROBABILITY, INTERACTIONS, BAND SPECTRA, INTENSITY

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE