High-Resolution Studies of the A1Π-X1Σ+ System of Si80Se

Rotational spectra, potential function, Born–Oppenheimer breakdown and magnetic shielding of SiSe and SiTe

“…(14b). The most recent literature values of x e and Àx e x e derived from electronic spectroscopy for the parent species 28 Si 80 Se [8] and 28 Si 130 Te [10] are also included in Table 5 for comparison. The present DPF analysis of the SiSe and SiTe rotational data were performed keeping the dissociation energies D e constrained to the theoretically computed values of Refs.…”

“…The first spectroscopic investigations of SiSe and SiTe in their monomeric forms appeared in the pioneering works of Barrow and co-workers [3,4] who observed their UV band spectra both in emission and in absorption. Subsequent investigations on the electronic spectra of silicon selenide [5][6][7][8] and silicon telluride [9,10] performed at higher resolution yielded vibrational and rotational constants of these molecules in their low-lying electronic states. The pure rotational spectrum of silicon selenide was investigated by Hoeft [11] using a X-band Stark modulated microwave spectrometer equipped with a high-temperature (680-740°C) waveguide absorption cell.…”

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.…”

“…In continuation of this effort we recently investigated the rotational structure of the A 1 -X 1 + system of SiSe, wherein numerous rotational perturbations were detected in the v = 0-4 vibrational levels of the A-state (15). In fact we found the perturbations in the higher levels of the A-state to be so severe that no meaningful analysis of bands with v ≥ 5 was possible.…”

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

“…The method is similar to the earlier ones employed for the study of Si 78 Se, Si 80 Se, 70 GeS and 74 GeS [10][11][12][13], except that the single isotope 74 Ge (98%) in slight stoichiometric excess, was introduced into the quartz tube and the single isotope 80 Se (99%) was distilled into it subsequently. Prior to sealing the tube off the vacuum line, neon at a pressure of 5 torr was admitted to serve as a carrier gas.…”