The Low Lying Electronic States of GeO

Abstract

The A 1Π-X 1Σ+ band system in 74Ge16O and 74Ge18O is analyzed and the local perturbations of the A 1Π state are assigned. Four new electronic states are reported, namely the d 3Δ, e 3Σ-, C 1Σ- and D 1Δ states. Vibrational numbering is determined from the isotopic shifts. The vibrational variations of the perturbation matrix elements are shown to be in agreement with single configuration arguments. The electronic spin-orbit parameter a + and the Coriolis parameter b are determined. The molecular constants for the eight lowest electronic states are reported. Semi-empirical and isovalent relationships between spin-orbit and spin-spin constants are also discussed. The equilibrium constants for the A 1Π state and the four perturbing states are in cm-1: State Te ω e Be A 1Π 37 763.1 648.8 0.414 32 D 1Δ 32 715 591 0.362 2 C 1Σ- 32 475 591 0.362 2 e 3Σ- 32 214 600 0.362 2 d 3Δ1 30 492 597 0.362 2

The Electronic Spectrum of Germanium Monosulfide: Rotational Structure in the A1Π–X1Σ+ Transition in 70GeS

“…Employing slightly better resolution than in the previous study (9), we have now carried out a comprehensive rotational analysis of 43 of the A-X bands in the specific isotopomer 70 GeS and, in the process, characterized the A 1 (v = 0-9) and X 1 + (v = 0-17) vibronic states. Though not as extensive as in the isoelectronic SiSe (15) or isovalent GeO (17) molecule, a few cases of localized perturbations in the A-state have been observed in the present studies. The details are discussed in this paper.…”

“…The rest of the electronic states are not involved in any direct transitions. In the isovalent molecules SiO, SiS, SiSe, SiTe, and GeO studied previously, the A 1 state was known to be extensively perturbed and in favorable cases the perturbing states could be characterized and accounted for by the remaining electronic states arising from configuration II (12)(13)(14)(15)(16)(17). Therefore, it was natural to expect the situation in GeS to be similar.…”

“…(9) revealed no perturbations in the A 1 state. But in the isovalent molecules SiO, SiS, SiSe, SiTe, and GeO (12)(13)(14)(15)(16)(17), the A 1 state is known to be perturbed to various degrees by a host of singlet and triplet states arising mainly from the . .…”

FTIR Emission Spectra, Molecular Constants, and Potential Curve of Ground State GeO

“…As one of the important oxides of group IVa elements, germanium monoxide (GeO) has been studied extensively, both theoretically (1)(2)(3)(4) and in a variety of experiments, including microwave spectroscopy (5,6), chemiluminescence studies of low-lying electronic states (7)(8)(9), photoelectron spectroscopy (10), electronic absorption (11)(12)(13), and emission (14) spectroscopy, and in matrix isolation (15,16), and gasphase infrared spectroscopy (17). Summaries of early spectroscopic work were reported by Capelle and Brom (9), Huber and Herzberg (18), and Ż yrnicki (14).…”

High-resolution Fourier transform emission spectroscopy of the A1Π–X1Σ+ system of 74Ge80Se

“…The 1 P state resulting from the first configuration is identifiable with the A 1 P being studied in this paper. In the isovalent molecules SiO, SiS, SiSe, SiTe, GeO and GeS studied previously, the A 1 P state was known to be extensively perturbed and in favorable cases the perturbing states could be characterized and accounted for by the remaining electronic states arising from the second configuration mentioned above [16][17][18][19][20]. Therefore, it is natural to expect the situation in GeSe, to be similar, which was another motivation for us to take up the present extensive investigations using enriched isotopes of germanium and selenium.…”