Photoemission from Mg irradiated by short pulse ultraviolet and visible lasers

Quantum efficiency of diamond turned magnesium was measured with low intensity, 266 nm, 12 ps, p-polarized radiation for various incident angles. The optimum quantum efficiency of 3×10−4 was obtained with p-polarized light incident close to Brewster’s angle where the absorption is maximum. Investiga...

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Bibliographic Details
Published in:Journal of applied physics 1995-02, Vol.77 (3), p.1275-1279
Main Authors: Srinivasan-Rao, T., Fischer, J., Tsang, T.
Format: Article
Language:English
Subjects:
ALKALINE EARTH METALS
BEAMS
CATHODES
EFFICIENCY
ELECTRODES
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION
ENERGY RANGE
EV RANGE
LASER RADIATION
MAGNESIUM
MATERIALS SCIENCE
METALS
PHOTOCATHODES
PHOTOEMISSION
PHYSICAL RADIATION EFFECTS
POLARIZED BEAMS
PULSES
QUANTUM EFFICIENCY
RADIATION EFFECTS
RADIATIONS
SECONDARY EMISSION 360106 > Metals & Alloys-- Radiation Effects
SURFACE TREATMENTS
ULTRAVIOLET RADIATION
VISIBLE RADIATION
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Summary:Quantum efficiency of diamond turned magnesium was measured with low intensity, 266 nm, 12 ps, p-polarized radiation for various incident angles. The optimum quantum efficiency of 3×10−4 was obtained with p-polarized light incident close to Brewster’s angle where the absorption is maximum. Investigations of the field dependence of the yield indicate that application of a high surface field is expected to lower the surface barrier by Schottky effect and increase the quantum efficiency further. Measurements of the electron yield with 632 nm radiation of 300 fs pulse duration indicate that at intensities exceeding 20 MW/cm2, the electric field due to the laser may become important and start contributing to the electron emission. Autocorrelation measurements at low intensities with this wavelength indicate that the electron emission is prompt.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.358929