A cell for electron irradiation of solid samples in vacuum at low temperatures and analysis of post-irradiation changes by visible—ultraviolet spectroscopy is described. Liquid nitrogen and constant temperature baths are used to control sample temperature during irradiation and spectral studies. Index Headings: Ultraviolet, Visible Instrumentation.
Get full access to this article
View all access options for this article.
References
1.
SaloveyR.AlbarinoR. V., and LuongoJ. P., private communication.
2.
A method of obtaining thermal equilibrium in film-mounted junctions is as follows: To prevent an excessive flow of heat into the junction, thermocouple wires are attached to a cold surface such as tube C (77 K), several inches before the junction. However, erroneously low film temperatures result if this point of thermal contact is too near the junction. An arbitrary length from junction to point of thermal contact is selected, e.g., 5 in. The unattached junction is placed in a frame slit (with no film present), the cell is evacuated, cooled down with liquid nitrogen, and the equilibrium junction temperature measured. This experiment is repeated with junction attached to a film. A series of such experiments is performed, varying the length of wire from junction to point of thermal contact each time so that unattached and attached junction temperatures converge.
