Accession Number : AD0716002

Title :   Spectroscopic Plasma Diagnostics for Advanced Aerospace Vehicles.

Descriptive Note : Interim scientific rept. for 1968-70,

Corporate Author : TORONTO UNIV (ONTARIO) INST FOR AEROSPACE STUDIES

Personal Author(s) : Measures,R. M.

Report Date : 03 NOV 1970

Pagination or Media Count : 71

Abstract : A great deal of research in recent years has been directed to developing ways of generating an inverted population in order to produce lasing action. The current research programme has been concerned with using laser radiation to redistribute the atomic level population of some species in order to probe the conditions within a gas or plasma. When an atomic transition is optically pumped by an appropriately tuned beam of laser radiation the population in the upper state of the transition can be considerably enhanced along the path of the beam. This will give rise to an intensification of the spontaneous emission emanating from the overpopulated state. It is from a study of this intensified emission that information can be ascertained pertaining to the condition of the specific volume element being pumped. The authors refer to this technique as 'Selective Excitation Spectroscopy'. (Author)

Descriptors :   (*PLASMA MEDIUM, OPTICAL PUMPING), ELECTRON DENSITY, EXCITATION, SPECTROSCOPY, POTASSIUM, TEST METHODS, ASTRONAUTICS, IONIZATION, CANADA

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE