Accession Number : AD0465682

Title :   TIME-OF-FLIGHT SPECTROMETER.

Descriptive Note : Semi-annual technical rept., Nov 64-1 Jun 65,

Corporate Author : GENERAL ELECTRIC CO SCHENECTADY NY ADVANCED TECHNOLOGY LABS

Personal Author(s) : Baldwin, G. C. ; Friedman, S. I.

Report Date : JUN 1965

Pagination or Media Count : 1

Abstract : A time-of-flight velocity selector is described that is designed for measurement of the total collision cross section of electrons in gases in the energy region below one volt, where beamdeflection methods are difficult and few data exist. The spectrometer essentially comprises a photoemitter, illuminated by a spark gap, separated by a shielded 0.45-meter drift path from a detector, consisting of an accelerating field and an electron multiplier, with electronic equipment for time and amplitude analysis and auxiliary apparatus for introduction of gases at known concentration. Design considerations are presented, followed by a description of the major components. Data illustrative of performance are given, together with initial transmission measurements in helium at electron energies down to 125 millivolts. Applications and extensions of the technique are discussed. (Author)

Descriptors :   (*SPECTRUM ANALYZERS, TIME), (*ELECTRONS, VELOCITY), VELOCITY, NUCLEAR CROSS SECTIONS, GEOMETRY, MATERIALS, DRIFT, RESOLUTION, VACUUM, ELECTROMAGNETIC SHIELDING, PERFORMANCE(ENGINEERING), REFLECTION, HELIUM, PHOTOELECTRIC EFFECT, ELECTRON MULTIPLIERS.

Distribution Statement : APPROVED FOR PUBLIC RELEASE