Measurement of vibrational population distributions in a supersonic expansion of carbon monoxide. Interim report

Technical Report · Sat Mar 01 04:00:00 EDT 1975

OSTI ID:7361522

Bender, D J

The results of an investigation of the vibrational kinetics of carbon monoxide in a supersonic expansion are presented. In the experiment, arc-heated argon was seeded with CO (5 to 20%) and expanded to Mach numbers of 4.0 to 4.2 in a time scale of 50 microsec. The stagnation temperature was varied between 2000 and 3000 K, and the stagnation pressure was approximately 7 atm. (abs). The vibrational state of the gas was determined by spectrally resolving the first overtone vibrational-rotational radiation from the CO, and obtaining individual vibrational populations from the emission spectra. The theoretical model used to describe the vibrational kinetics accounted for the anharmonic vibrational energy level structure of CO. Rate equations were formulated that describe the evolution of the populations of the individual levels due to vibration-translation, vibration-vibration and radiative processes as the gas flows through the nozzle.

• Research Organization: Stanford Univ., Calif. (USA). Inst. for Plasma Research
• OSTI ID: 7361522
• Report Number(s): AD-A-012585; SU-IPR-622
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
CARBON MONOXIDE LASERS
ENERGY-LEVEL TRANSITIONS
FLUID FLOW
GAS LASERS
KINETICS
LASERS
RELAXATION
SUPERSONIC FLOW