A SHOCK TUBE STUDY OF THE VIBRATIONAL RELAXATION OF NITRIC OXIDE

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)

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1961
Accession Number
AD0270621

Entities

People

  • Kurt L. Wray

Tags

DTIC Thesaurus Topics

  • Absorption
  • Collisions
  • Oscillators
  • Probability
  • Radiation
  • Relaxation Time
  • Shock Tubes
  • Transitions
  • Tubes
  • Vibrational Relaxation

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Plasma Physics.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.