TL;DRAbstract
The emission spectrum of Se0 was excited in an electrode-less discharge tube containing Selenium dioxide powder by means of a high power microwave generator. Two new band systems of Se0 in the photographic infrared region 10 780 - 9490 Å consisting of 46 bands degraded to longer wavelengths have been observed for the first time. The vibrational analysis of one band system which consists of several double-headed bands shows that it arises from the forbidden transition b ¹Ʃ⁺ - X ³Ʃ⁻ . The double-headed bands have been analyzed as belonging to the ¹Ʃ⁺ - X ³Ʃ⁻(F₁) and ¹Ʃ⁺ - X ³Ʃ⁻(F₂,F₃) sub-systems. The separations between the corresponding band heads of these two sub-systems are consistent with the expected value of ⁻2λ , λ (= 86.4 cm⁻¹) being the splitting constant of the ³Ʃ⁻ state derived by Barrow and Deutsch (1963) from a detailed rotational analysis of the B ³Ʃ⁻ - X ³Ʃ⁻ system of Se0. The vibrational assignments are confirmed by the observed isotope band heads of ⁸²Se0, ⁸⁰Se0, ⁷⁸Se0,
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The emission spectrum of Se0 was excited in an electrode-less discharge tube containing Selenium dioxide powder by means of a high power microwave generator. Two new band systems of Se0 in the photographic infrared region 10 780 - 9490 Å consisting of 46 bands degraded to longer wavelengths have been observed for the first time. The vibrational analysis of one band system which consists of several double-headed bands shows that it arises from the forbidden transition b ¹Ʃ⁺ - X ³Ʃ⁻ . The double-headed bands have been analyzed as belonging to the ¹Ʃ⁺ - X ³Ʃ⁻(F₁) and ¹Ʃ⁺ - X ³Ʃ⁻(F₂,F₃) sub-systems. The separations between the corresponding band heads of these two sub-systems are consistent with the expected value of ⁻2λ , λ (= 86.4 cm⁻¹) being the splitting constant of the ³Ʃ⁻ state derived by Barrow and Deutsch (1963) from a detailed rotational analysis of the B ³Ʃ⁻ - X ³Ʃ⁻ system of Se0. The vibrational assignments are confirmed by the observed isotope band heads of ⁸²Se0, ⁸⁰Se0, ⁷⁸Se0,
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