A Raman instrument for rotation‐vibrational spectra using laser excitation

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Abstract
A description is given of an instrument designed for the registration of rotation‐vibrational Raman spectra. The gas sample cell has a volume of 20 ml and forms one end of the cavity of an argon‐ion laser. The laser beam is focused to a diameter of 50 μ inside the cell. The scattered light passes a double premonochromator and is registered photographically in a grating spectrograph.The resolution obtained is about 0.3 cm−1, determined by the pressure broadening in the sample. The detectability for weak lines is high, as demonstrated by the observation of previously unobserved vibrational bands.The instrument may also be used for pure rotational Raman spectra, primarily for weak scatterers. A pure rotational spectrum of CO2 is obtained in an exposure of ½ min.

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