The spectra are registered on a recorder by a pen mechanically linked to this comb. signal on the bolometer is used to drive a variable comb diaphragm in the reference beam. at the entrance slit to the spectrometer. The sample and reference beams are alternately chopped at 10 cycles/sec. Note: Author names will be searched in the keywords field, also, but that may find papers where the person is mentioned, rather than papers they authored.Īn automatic recording spectrophotometer for the infrared is described, which employs a double-beam source, Littrow spectrometer, fast bolometer, and high speed pen- and drum-recording system.Use a comma to separate multiple people: J Smith, RL Jones, Macarthur.Use these formats for best results: Smith or J Smith.For best results, use the separate Authors field to search for author names.Use quotation marks " " around specific phrases where you want the entire phrase only.Question mark (?) - Example: "gr?y" retrieves documents containing "grey" or "gray".Asterisk ( * ) - Example: "elect*" retrieves documents containing "electron," "electronic," and "electricity".Improve efficiency in your search by using wildcards.Example: (photons AND downconversion) - pump.Example: (diode OR solid-state) AND laser. ![]() Note the Boolean sign must be in upper-case.
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