Accession Number : AD0773479

Title :   Relaxation Rates from Time of Flight Analysis of Molecular Beams.

Descriptive Note : Technical rept.,

Corporate Author : PURDUE UNIV LAFAYETTE IND PROJECT SQUID HEADQUARTERS

Personal Author(s) : Gallagher,Robert J. ; Fenn,John B.

Report Date : DEC 1973

Pagination or Media Count : 33

Abstract : In the free jet generated when a gas is expanded from a reservoir at stagnation temperature, T(O), and pressure, P(O), into a vacuum chamber; substantial lags can occur in the conversion of internal energy into directed kinetic energy of the expansion. An analytical technique is presented for determining rotational energy relaxation rates from velocity distributions measured on the axis of the free jet at a fixed distance from the sonic throat. The agreement with rates obtained by other methods is good. Some experimental and analytical results for carbon dioxide, oxygen, hydrogen, and methane are presented. (Author)

Descriptors :   *Molecular beams, Relaxation, Carbon dioxide, Oxygen, Hydrogen, Methane, Nozzle gas flow, Energy transfer

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE