Accession Number:

AD0679032

Title:

RESEARCH ON METASTABLE SPECIES IN ATOMIC AND MOLECULAR BEAMS PRODUCED BY CHARGE TRANSFER. TASKS 1, 2, AND 3

Descriptive Note:

Semiannual rept. no. 3, 28 Jan-30 Sep 1968

Corporate Author:

STANFORD RESEARCH INST MENLO PARK CA

Personal Author(s):

• Peterson, J. R.
• Black, G.

Report Date:

1968-11-05

Pagination or Media Count:

29.0

Abstract:

Two types of experiments are being used to study collisions between metastable species and ground state atoms and molecules. One type involves fast beams energies between 150 and 1000 eV containing excited particles, and is aimed at developing methods of detecting these species, as well as measuring cross sections for their collisional deexcitation. Studies of the detection and deexcitation of He 2-1S and 2-3S metastables are reported the techniques developed for these studies are expected to be used for atmospheric species. The other type of experiment involves the production of metastables by rf excitation and photodissociation of low pressure gases. The mechanisms and rates of energy transfer between many excited and ground state species of particular importance in the upper atmosphere have been examined. Deactivation of O1D, O1S, O2b1 sigma, and N2A3 sigma is discussed here. Another phase of our program has involved field measurements of emissions from Ba-Sr releases in the upper atmosphere.

Descriptors:

• *MOLECULAR BEAMS
• *MOLECULAR ENERGY LEVELS
• *UPPER ATMOSPHERE
• AFTERGLOWS
• ATMOSPHERE ENTRY
• ATMOSPHERIC SOUNDING
• ATOMIC ENERGY LEVELS
• BARIUM
• DISSOCIATION
• EXCITATION
• GAS IONIZATION
• HELIUM
• NITROGEN
• OXYGEN
• PHOTOCHEMICAL REACTIONS
• STRONTIUM

Subject Categories:

• Atmospheric Physics
• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE