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SIMPLE 10 eV-PHOTON DETECTOR

IP.com Disclosure Number: IPCOM000042458D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Haupt, E: AUTHOR [+3]

Abstract

Vacuum ultraviolet radiation of an energy around 10 eV is detected with a Geiger-Muller type counter [1, 2] comprising a stainless steel tube 1 closed at one end by a calcium fluoride window 2 and at the other enlarging into an extension 3 which is closed by a flange 4. Melted into a glass-KOVAR* feedthrough 5 of flange 4 is an etch-cleaned tungsten wire 6. Window 2 is glued to tube 1 with a low-vapor-pressure ultra-high vacuum glue 7 covered with graphite to avoid charging. Flange 4 rests against a rubber ring 8 which, in turn, rests against a shoulder 9 of extension 3 of tube 1, providing a seal for a 10-7 mbar or better vacuum. Extension 3 has a compartment 10 connected to it for receiving an ampoule 11 filled with purified iodine.

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SIMPLE 10 eV-PHOTON DETECTOR

Vacuum ultraviolet radiation of an energy around 10 eV is detected with a Geiger-Muller type counter [1, 2] comprising a stainless steel tube 1 closed at one end by a calcium fluoride window 2 and at the other enlarging into an extension 3 which is closed by a flange 4. Melted into a glass-KOVAR* feedthrough 5 of flange 4 is an etch-cleaned tungsten wire 6. Window 2 is glued to tube 1 with a low-vapor-pressure ultra-high vacuum glue 7 covered with graphite to avoid charging. Flange 4 rests against a rubber ring 8 which, in turn, rests against a shoulder 9 of extension 3 of tube 1, providing a seal for a 10-7 mbar or better vacuum. Extension 3 has a compartment 10 connected to it for receiving an ampoule 11 filled with purified iodine. Compartment 10 is separated from extension 3 by a mesh 12 to prevent glass fragments from entering when ampoule 11 is cracked to provide the filling gas for tube 1. Via a stainless steel valve 13 connected to compartment 10 is a noble gas reservoir and a pump. Welded to tube 1 is a flange 14 which permits the detector to be mounted into an ultra-high vacuum system. Applying a voltage to tungsten wire 6, the threshold voltage for gas discharge in the iodine vapor is used to adjust the noble gas pressure inside the detector. * Trademark of Westinghouse Electric Corporation. References [1] J. A. R. Samson, Techniques of Vacuum Ultraviolet Spectroscopy, John Wiley & Sons, New York 1967, Chapter 7.4. [2] V. D...