Accession Number : AD0270621

Title :   A SHOCK TUBE STUDY OF THE VIBRATIONAL RELAXATION OF NITRIC OXIDE

Corporate Author : AVCO EVERETT RESEARCH LAB EVERETT MASS

Personal Author(s) : WRAY,KURT L.

Report Date : JUN 1961

Pagination or Media Count : 1

Abstract : The vibrational relaxation time of nitric oxide in NO-Ar mixtures was determined over the temperature range 1500-7000 K. An ultraviolet absorption technique using 1270 A radiation was employed to monitor the vibrational temperature as a function of time after these mixtures were shock heated to high translational temperatures. P10, the transition probability per oscillator per collision for transition between vibrational levels 1 and 0 calculated from the measured relaxation times ranged from 0.001 at 1500 K to 0.028 at 7000 K for NO-NO collisions. Argon is about 1/50 as efficient as NO. The results are compared with the lower temperature (400-1500 K) work of Robben and with the adiabatic theory of Schwartz, Slawsky, and Herzfeld and the nonadiabatic theory of Nikitin. (Author)

Descriptors :   *NITROGEN COMPOUNDS, *OXIDES, *QUANTUM THEORY, *QUANTUM STATISTICS, *SHOCK TUBES, ABSORPTION, ADIABATIC GAS FLOW, ARGON, HEATING, HIGH TEMPERATURE, RELAXATION TIME, SHOCK WAVES, THEORY, TIME, ULTRAVIOLET RADIATION, VIBRATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE