Accession Number:

AD0644814

Title:

SPECTRAL ANALYSIS OF MECHANISMS AND KINETICS OF THERMAL ENERGY REACTIONS OF LONG-LIVED ENERGETIC HELIUM SPECIES WITH SIMPLE MOLECULES

Descriptive Note:

Technical rept.

Corporate Author:

CALIFORNIA UNIV SANTA BARBARA DEPT OF PHYSICS

Personal Author(s):

Report Date:

1966-11-01

Pagination or Media Count:

154.0

Abstract:

An optical spectroscopic technique for determining rate coefficients was developed and utilized for measuring the decrease in energetic helium as a function of added reactant concentration. Relative concentration measurements of the helium species were made by introducing a second reactant to the afterglow and monitoring relative intensities of the resulting spectra. Individual reactions involving single helium species were studied by observing transitions of the second reactant whose upper states were preferentially excited by the energetic helium species to be measured. Rate coefficients were limited to the range of 10 to the -9th power to 10 to the -13th power ccsec. Penning ionization reactions with metastable He and ion-neutral reactions with He were compared to published values. Overall agreement of the rates reported in these experiments and published values measured by optical absorption and mass spectrometric techniques gives confidence in the general method. In addition, nitrogen spectra selectively excited in a helium afterglow were studied in order to understand details of the excitation processes. Author

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE