Accession Number : AD0725035

Title :   Difference Band Contributions to the Infrared Emission at 2.7 microns from Flowing CO2-N2* Mixtures.

Descriptive Note : Rept. for Jul 70-Feb 71,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Oettinger,Peter E. ; Horn,Kenneth P.

Report Date : 10 MAY 1971

Pagination or Media Count : 25

Abstract : A flow tube has been constructed wherein ground-state CO2 and vibrationally excited N2 molecular streams interact and the combined flow is spectrally investigated at selected downstream stations. The close coupling between the lower vibrational levels of N2(X singlet Sigma(g)(+)) and the CO2 asymmetric stretch mode (00V3) allows rapid energy exchange to these levels, followed by internal redistribution among the vibrational states of the various CO modes. By monitoring the emission at the 2.7-micron band, it has been observed that such redistribution produces substantial population of the mixed-mode levels associated with this radiation. In addition, comparison of the observed band profiles with analytically derived counterparts has indicated that, for a N2 vibrational temperature of 1900C, CO2 difference bands at 2.7 micron contribute approximately 2.5 times as much radiant energy as is emitted in the 10 1-00 0 and 02 0-00 0 summation bands. (Author)

Descriptors :   (*NITROGEN, EMISSIVITY), (*CARBON DIOXIDE, INTERACTIONS), INFRARED SPECTRA, MOLECULAR ENERGY LEVELS, VIBRATION, GAS FLOW, ELECTRON TRANSITIONS

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE