Accession Number : AD0767193

Title :   Measurement and Analysis of the HF Radiation from a Reacting Supersonic Jet.

Descriptive Note : Rept. for Jan 71-Jan 72,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Kwok,Munson A.

Report Date : 15 SEP 1973

Pagination or Media Count : 64

Abstract : The spontaneous emission from HF infrared bands in the free jet of a continuous HF chemical laser with a slit nozzle bank has been measured at a number of downstream positions. Three cases are reported: high-power flow (1) that includes O2, (2) without O2, and (3) with reduced SF6. Spatially averaged number densities of the HF vibrational levels (v = 1, 2, 3, 4) have been determined for the zero-power case. Vibrational nonequilibrium is evident. Observed rotational temperatures range from 560 down to 400 degrees K. Gain coefficients are deduced. Data have been fitted to both a one-dimensional, constant-pressure streamtube jet model and a two-dimensional model; the best fit occurs with the latter. Deactivation plays an important role in determining the average gain. The principal deactivator of HF(v) is H. Other important deactivation mechanisms are vibration-vibration transfers with HF or H2. (Modified author abstract)

Descriptors :   (*GAS LASERS, SUPERSONIC FLOW), (*SUPERSONIC FLOW, CHEMILUMINESCENCE), GAS FLOW, QUENCHING(INHIBITION), FLUORIDES, HYDROGEN COMPOUNDS, OXYGEN, SULFUR COMPOUNDS, INFRARED SPECTRA, HYDROGEN, REACTION KINETICS, COMBUSTION

Subject Categories : Lasers and Masers
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE