LOW-ENERGY MOTT POLARIMETRY OF ELECTRONS FROM NEGATIVE ELECTRON-AFFINITY PHOTOCATHODES

被引：28

作者：

CICCACCI, F ^{[1
]}

DEROSSI, S ^{[1
]}

CAMPBELL, DM ^{[1
]}

机构：

[1] UNIV EDINBURGH,DEPT PHYS,EDINBURGH EH9 3JZ,MIDLOTHIAN,SCOTLAND

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 1995年 / 66卷 / 08期

关键词：

D O I：

10.1063/1.1145364

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We present data on the spin polarization P and quantum yield Y of electrons photoemitted from negative electron affinity semiconductors, including GaAs(100), GaAsP(100) alloy, and strained GaAs layer epitaxially grown on a GaAsP(100) buffer. Near photothreshold the following values for P(Y) are, respectively, obtained: 26% (2.5X10(-2)), 40% (1X10(-3)), and 60% (1.5x10(-4)). We describe in detail the apparatus used containing a low energy (10-25 keV) Mott polarimeter. The system, completely fitted in a small volume (similar to 10(4) cm(3)) ultrahigh vacuum chamber, is intended as a test facility for characterizing candidate photocathode materials for spin polarized electron sources. (C) 1995 American Institute of Physics.

引用

页码：4161 / 4165

页数：5

共 31 条

[1] GAAS-ALXGA1-XAS SUPER-LATTICES AS SOURCES OF POLARIZED PHOTOELECTRONS [J].

ALVARADO, SF ;

CACCACCI, F ;

CAMPAGNA, M .

APPLIED PHYSICS LETTERS, 1981, 39 (08) :615-617

[2] A COMPACT CYLINDRICAL MOTT ELECTRON POLARIMETER OPERATING WITH ACCELERATING VOLTAGE IN THE RANGE 20-100 KV [J].

CAMPBELL, DM ;

HERMANN, C ;

LAMPEL, G ;

OWEN, R .

JOURNAL OF PHYSICS E-SCIENTIFIC INSTRUMENTS, 1985, 18 (08) :664-672

[3]

CICCACCI F, 1989, NATO ADV SCI I B-PHY, V206, P317

[4] SPIN-POLARIZED PHOTO-ELECTRON EMISSION STUDY OF ALXGA1-XAS ALLOYS GROWN BY MOLECULAR-BEAM EPITAXY [J].

CICCACCI, F ;

ALVARADO, SF ;

VALERI, S .

JOURNAL OF APPLIED PHYSICS, 1982, 53 (06) :4395-4398

[5] SPIN-POLARIZED PHOTOEMISSION FROM ALGAAS GAAS HETEROJUNCTION - A CONVENIENT HIGHLY POLARIZED ELECTRON SOURCE [J].

CICCACCI, F ;

DROUHIN, HJ ;

HERMANN, C ;

HOUDRE, R ;

LAMPEL, G .

APPLIED PHYSICS LETTERS, 1989, 54 (07) :632-634

[6] COMPARATIVE-STUDY OF THE PREPARATION OF NEGATIVE ELECTRON-AFFINITY GAAS PHOTOCATHODES WITH O-2 AND WITH NF-3 [J].

CICCACCI, F ;

CHIAIA, G .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1991, 9 (06) :2991-2995

[7] GAAS/ALAS MONOLAYER SUPERLATTICES - A NEW CANDIDATE FOR A HIGHLY SPIN-POLARIZED ELECTRON SOURCE [J].

CICCACCI, F ;

MOLINARI, E ;

CHRISTENSEN, NE .

SOLID STATE COMMUNICATIONS, 1987, 62 (01) :1-3

[8] CALIBRATING THE SPIN POLARIZATION IN ELECTRON-BEAMS FROM NEA GAAS PHOTOCATHODES BY MEANS OF ELECTRON-SPECTROSCOPY [J].

CICCACCI, F ;

CHIAIA, G ;

DEROSSI, S ;

LENISA, P .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1994, 340 (01) :122-126

[9]

CICCACCI F, 1992, REV SCI INSTRUM, V63, P333

[10]

CONRATH D, 1979, APPL PHYS, V20, P1955

← 1 2 3 4 →