Accession Number : AD0435842


Title :   ELECTRON TIME-OF-FLIGHT VELOCITY SELECTOR.


Descriptive Note : Quarterly rept. no. 5 for period ending 31 Jan 64.


Corporate Author : GENERAL ELECTRIC CO SCHENECTADY N Y


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


Report Date : 31 Jan 1964


Pagination or Media Count : 6


Abstract : A time-of-flight velocity selector was constructed that is designed for measurement of the collision probabilities in gases of electrons in the energy region below 1 V, since beam-deflection methods become very difficult and few data exist in this energy region. In this spectrometer, a gold photoemitter, illuminated by a zinc spark gap, repetitively emits bursts of electrons with a continuum of energies from 0 to about 1 eV. The electrons drift up a well-shielded drift chamber coated with aquadag. A portion pass through a gold grid 44 cm from the emitter, into an accelerating field that imparts energy sufficient for detection by a phosphor or secondary multiplier, and are registered by time analysis. Design problems are discussed. Measured photoelectron time spectra are compared with the energy spectrum obtained by the retarding-potential method. (Author)


Descriptors :   SPECTROSCOPY , ELECTRONS , VELOCITY , TIME , PROBABILITY , GASES , DEFLECTION , ELECTRODES , GOLD , PHOTOELECTRIC EFFECT , PHOTOELECTRONS , VOLTAGE , MEASUREMENT , ENERGY


Distribution Statement : APPROVED FOR PUBLIC RELEASE