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- W1974047457 abstract "A method is described for obtaining high quality photoelectrically recorded Raman spectra of gases at pressures of 1 to 2 atmospheres. Sufficient intensity was obtained by the use of a multiple reflection cell and six watercooled mercury arcs, each carrying 20 amp. All the corrections required for obtaining true intensities and depolarization ratios from those observed were evaluated experimentally. Comparison of the theoretical values of intensity ratios of hydrogen rotational lines, the H2 and D2 vibrational lines, and the depolarization ratio of the symmetrical CC stretching band of neopentane with those observed in the present setup (after being corrected) show that the method presented for obtaining the true intensity is not in error by more than a few percent. The intensitites and depolarization ratios of the Raman bands for some simple molecules were measured. It was possible to assign the Raman spectrum of the bands in the 1950-cm−1 region in acetylene from intensity considerations, and a definitive value for the anharmonicity constant X24 is obtained and an upper limit given for X25. A simple model is discussed by which the Raman intensity of the totally symmetrical stretching band in the hydrides HnY, and the polarizabilities of these molecules, may be estimated. The present theory of the Raman effect is applicable only to molecules in the gas phase at relatively low pressure. Gas spectra have been obtained photographically where long exposure can compensate for the weak intensity of the Raman scattering, however, such spectra yield, in general, poor Raman intensity data. The photoelectric method of recording Raman spectra of gases is a more accurate means of obtaining the intensities of the Raman bands, but it has been difficult to put into practice because of the low intensity of the Raman scattering. In the first part of this work a method is described for obtaining photoelectrically recorded Raman spectra of gases of sufficiently high quality to make possible good intensity and depolarization measurements. In the second part, the results for some simple molecules are presented and discussed." @default.
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- W1974047457 date "1958-01-01" @default.
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- W1974047457 title "Intensity in the Raman effect" @default.
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- W1974047457 doi "https://doi.org/10.1016/0022-2852(58)90076-6" @default.
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