Photoemission studies on metals using picosecond ultraviolet laser pulses

Journal Article · Thu Feb 28 23:00:00 EST 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.348550· OSTI ID:6003490

Srinivasan-Rao, T; Fischer, J; Tsang, T ^[1]

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1. Brookhaven National Laboratory, Upton, New York 11973 (US)

We report the quantum efficiency of various metals irradiated by 266-nm, 4.66-eV laser pulses of 10-ps duration. The highest quantum efficiency obtained is 7.25{times}10{sup {minus}4} with samarium photocathodes. Current densities exceeding 66 and 21 kA/cm{sup 2} have been obtained from an area of 0.05 and 7 mm{sup 2}, respectively. The maximum currents and current densities obtainable in these experiments are limited by the space charge. For surface fields exceeding 5{times}10{sup 7} V/m on gold, the efficiency increases linearly with the field for the values investigated. Based on the quantum efficiency and optical damage threshold measurements, current densities exceeding 100 kA/cm{sup 2} seem feasible without damaging the photocathode.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6003490
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:5; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BNL
CATHODES
CURRENT DENSITY
EFFICIENCY
ELECTRODES
ELECTROMAGNETIC RADIATION
ELECTRON SOURCES
ELEMENTS
EMISSION
GOLD
LASER RADIATION
METALS
NATIONAL ORGANIZATIONS
PARTICLE SOURCES
PHOTOCATHODES
PHOTOEMISSION
PHYSICAL RADIATION EFFECTS
QUANTUM EFFICIENCY
RADIATION EFFECTS
RADIATION SOURCES
RADIATIONS
RARE EARTHS
SAMARIUM
SECONDARY EMISSION
SPACE CHARGE
TRANSITION ELEMENTS
US AEC
US DOE
US ERDA
US ORGANIZATIONS