Ultra-violet absorption band-systems of SiS, SiSe and SiTe

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Abstract
A new ultra-violet band-system, E-X, of each of the molecules SiS, SiSe and SiTe has been observed in absorption at 800-1000° C., and vibrational analyses have been done. The D-X systems, already known in emission, have also been photographed in absorption. These observations have extended the D-X systems of SiSe and of SiTe and have led to somewhat improved values of the vibrational constants. The results are summarized in the following table: - Molecule State νe we xewe Yewe De SiS E 42322.1 402.3 -1.74 -0.025 1.2 eV. D1Π 35028.8 512.0 -2.38 -0.045 2.3 X1Σ 0 749.5 -2.56 - 6.6 SiSe E 38505.9 308.8 -1.95 -0.032 1.3 D 32450.3 399.8 -1.93 - 2.0 X(1Σ) 0 580.0 -1.78 - 6.0 SiTe E 33991 242 (-3.63) (+0.13) (1.4) D 28661.8 338.6 -1.70 - 2.0 X(1Σ) 0 481.2 -1.30 - 5.6

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