Experimental Raman Cross-Section of Hydrogen and Deuterium Molecules for Absolute Density Calibration of Thomson Scattering Device

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Abstract
The Raman scattered light is polarized only 14% by linearly-polarized ruby laser light incident in D2. The total Raman cross-sections of H2 and D2 for the ruby-laser wavelength of 6943 Å were estimated from an experiment. The Raman cross-section σH2 (J) of the J=2 →0 pure rotational transition for H2 was found to be 2.5·10-30 cm2, while σD2 (J) of the J=3 →1 pure rotational transition for D2 was 2.3·10-30 cm2.