Accession Number:

AD0270621

Title:

A SHOCK TUBE STUDY OF THE VIBRATIONAL RELAXATION OF NITRIC OXIDE

Descriptive Note:

Corporate Author:

AVCO EVERETT RESEARCH LAB EVERETT MASS

Personal Author(s):

Report Date:

1961-06-01

Pagination or Media Count:

1.0

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 150 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

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE