Passband-adjustable photo-detector for inverse photoemission spe

Details Passband-adjustable photo-detector for inverse photoemission spe Passband-adjustable photo-detector for inverse photoemission spe

1995-03-15

1996-09-10

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2504581, 2504591, 250372, G01N 2100, G02F 101, H01L 3110

Patent

active

055548440

ABSTRACT:
A passband-adjustable photo-detector for inverse photoemission spectroscopy, in which an electron beam from an electron gun is applied onto a sample and a light reflected therefrom is converged, so as to effect photo-detection, wherein said photo-detector comprises a photo-electron multiplier, a LiF monocrystal window and a CaF.sub.2 monocrystal window individually deposited with a KCl thin film in the front of a photo-electron multiplier in the photo-detector, wherein said windows means are provided for arbitrarily setting the temperature from the vicinity of liquid nitrogen temperature to the order of 150.degree. C., a photo-electron multiplier having a first dinode deposited a KCl thin film on a surface thereof said photo-electron multiplier, and an output of the photo electron multiplier is connected with a pulse counter circuit through an amplifier, so as to measure anyone selected from the group consisting of light absorption property, window transmissibility and sensitivity as a bandpass filter.

REFERENCES:
patent: 3712700 (1973-01-01), Sommer
patent: 5120965 (1992-06-01), Suga et al.
patent: 5340976 (1994-08-01), Taniguchi et al.

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