A method for the application of plastic filter dopes to Raman tubes was developed. Such filters were devised for isolation of the 4358. A mercury triplet, which was used as the exciting source. Derivatives of nitrobenzene dissolved in a urea-melamine-formaldehyde resin effectively removed the 4047. A pair. During long ex-posures to mercury lamp radiations, these filters darkened. A film of light stable Eastman Acetate Lacquer 390-37-2 served the same purpose. Removal of continuous background was effected by Rhodamine 5GDN Extra in polymethyl methacrylate, Tygon lacquers, cellulose acetate, cellophane, or urea-melamine-formaldehyde resins. An Eastman gelatin filter produced similar results. A filter utilizing both the Eastman Acetate Lacquer and the Rhodamine dye in the urea-melamine-formaldehyde resin was stable to over 240 hours exposure to twelve General Electric A-H2 mercury lamps.
Proceedings of the Iowa Academy of Science
©1948 Iowa Academy of Science, Inc.
Glockler, Geo. and Haskin, John F.
"Raman Tube Filters,"
Proceedings of the Iowa Academy of Science, 55(1), 253-262.
Available at: https://scholarworks.uni.edu/pias/vol55/iss1/34