Infra-Red and Raman Spectra of Polyatomic Molecules I. An Automatic Prism Spectrometer for the Infra-Red

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Abstract
A spectrometer has been constructed which contains two prisms, one of NaCl, the other of KBr, each in a Wadsworth‐Littrow mounting. The prisms may be interchanged in the optical train without opening the spectrometer housing or disturbing the calibration. The recording system includes a Barnes‐Matossi type amplifier using a photronic cell. The recording is done stepwise, so that the zero of the amplifying system, the intensity of the source and the intensity of transmitted radiation are measured at each setting of the prism table, which is moved by a ratchet device.

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