Accession Number : AD0616523

Title :   ELECTRON TRANSIT IN AGBR AT 85 DEGREES K,

Corporate Author : BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD

Personal Author(s) : Knapton,John D.

Report Date : MAR 1965

Pagination or Media Count : 20

Abstract : Some of the factors which can affect the transit of a pulse of electrons across a Bridgman AgBr crystal at 85 = 2 K were studied. The factors studied include the electron drift mobility (mu), electron trapping, and electrode charge injection. A fast pulse (5 nanosec) electron beam system was used for the excitation source. The value for mu, in substantial agreement with the work of Chollet and Rossel (J. Helv. Phys. Acta. 33:627 (1960); Proc. of the International Conf. on Semiconductor Physics, Prague, 1960. Academic Press, 1961, p. 677), was found equal to 389 = 12% sq cm/vsec. This value indicates that the scattering mechanism is primarily by longitudinal optical vibrations. Three different methods were used for determining mu: (1) measuring the rise time of the integrated charge associated with the electron pulse motion, (2) measuring the duration of the electron current pulse, and (3) fitting the integrated charge to a uniform trapping theory. Agreement was obtained between the three methods. Evidence is presented for an electron emission process possibly caused by shallow trapping. No evidence for electrode charge injection was found. (Author)

Descriptors :   (*SILVER COMPOUNDS, BROMIDES), (*ELECTRONS, DRIFT), EXCITATION, CRYSTALS, CRYOGENICS, ELECTRON BEAMS

Distribution Statement : APPROVED FOR PUBLIC RELEASE