CROSS SECTION FOR PHOTOIONIZATION OF EXCITED CESIUM ATOMS.

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Abstract:

The objective of the present program is to determine the cross section for photoionization of excited cesium atoms. The highlight of the experiment is to use a thermally tunable gallium-arsenide laser to generate a high concentration of atoms in the first excited state, and then to ionize the excited atoms by means of radiation from a monochromator. The cross section for this process is about 100 times larger than that for photoionization of ground-state cesium atoms, and for this reasion the corresponding non-equilibrium rates are significant in thermionic energy converters and MHD generators. During the first contract period most of the apparatus that will be used in the experiment was constructed and tested. This includes an ultra-high vacuum system, atomic beam oven and detector and optical radiation sources and detectors. Special emphasis has been put on the properties of the gallium-arsenide lasers. Author

Author(s):
Nygaard, Kaare J. ; Hebner, Robert E., Jr
Author Organization(s):
MISSOURI UNIV ROLLA DEPT OF PHYSICS
Descriptive Note:
Technical rept. no. 1 (Annual) 1 Mar 69-28 Feb 70,
Pagination:
0036

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Contract/Grant Number(s):
N00014-69-C-0271
Project Number(s):
NR-099-390
 Subject Terms
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
(*CESIUM, *IONIZATION), COHERENT RADIATION, MONOCHROMATIC LIGHT, EXCITATION, ELECTRON TRANSITIONS, VACUUM APPARATUS, LASERS, INSTRUMENTATION, THERMIONIC CONVERTERS, MAGNETOHYDRODYNAMIC GENERATORS
Field(s)/Group(s):
Physical Chemistry
Keyword(s):
*PHOTOIONIZATION, GALLIUM ARSENIDES, LASERS, *CROSS SECTIONS, *IONIZATION
Report Date:
1970 Mar 30