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The spectrum of matrix-isolated GeO and GeS

1971; Elsevier BV; Volume: 37; Issue: 1 Linguagem: Inglês

10.1016/0022-2852(71)90045-2

1096-083X

Beat Meyer, Yvonne Jones, J. J. Smith, Kenneth D. Spitzer,

Spectroscopy and Laser Applications

The spectrum of GeO and GeS was studied in the 14 000 to 50 000 cm−1 region in argon, krypton, xenon, oxygen, sulfur hexafluoride, and methane at 20°K. In both molecules the system A 1Π-X1Σ is observed. The analysis of the spectrum of GeS corresponds to that in the gas phase. For GeO in xenon, vibrational bands to the red of the gas phase (0,0) are found. This suggests that the gas phase numbering should be corrected by +1. This yields a new T0.0 = 36 996 cm−1. In both molecules, excitation into the A state yields phosphorescence in the visible. The emission is assigned to the previously unknown transition a3Π-X1Σ, which corresponds to the Cameron bands of isovalent CO. T0.0 of the a3Π state in SF6 at 20°K is 26 945 ± 200 cm−1 for GeO, and 22 465 ± 200 for GeS. From the transition energies in various matrices we deduce a gas phase value of T0.0 = 26 900 ± 200 cm−1 for GeO and 22 500 ± 200 cm−1 for GeS. The phosphorescence results from matrix-induced intersystem crossing. Absorption and emission shifts are consistent with the external heavy atom effect. The spectrum of matrix-isolated GeO and GeS is in all respects analogous to that of SnO and SnS.