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:

1964-01-31

Pagination or Media Count:

6.0

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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE