Abstract

The pure rotational Raman spectra of the lighter halogen molecules have been studied by several authors. Andrychuk, Claassen <i>et al.,</i> Stricker and Hochenbleicher, and Edwards <i>et al.,</i> reported the spectra of fluorine, whereas Hochenbleicher and Schrötter and Hendra and Vear were able to record the pure rotational Raman spectrum of chlorine. Accurate values of the rotational constant <i>B</i><sub>0</sub> have been obtained for these molecules. However, because of the low value of <i>B</i><sub>0</sub> the pure rotational Raman spectrum of the heavier halogen molecules could not be resolved until now. In the course of an extensive resonance Raman spectroscopic study on natural bromine (which is a mixture of the molecules <sup>79</sup>Br<sub>2</sub>, <sup>79</sup>Br<sup>81</sup>Br and <sup>81</sup>Br<sub>2</sub>) as well as on the isotopically pure molecules <sup>79</sup>Br<sub>2</sub> and <sup>81</sup>Br<sub>2</sub>, we have also studied the rotational Raman spectra of the isotopically pure species <sup>79</sup>Br<sub>2</sub> and <sup>81</sup>Br<sub>2</sub>. The results will be presented in this note, where it is shown that the pure rotational Raman spectra of fairly heavy linear molecules can be obtained directly with photoelectric recording.

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