The aΔg→XΣg magnetic dipole transition of S2 |
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Authors: | KD Setzer |
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Institution: | Physikalische Chemie-Fachbereich 9, Bergische Universität Wuppertal, Gauss-Strasse 20, D-42097 Wuppertal, Germany |
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Abstract: | Emission spectra of the 0-0 band of the a1Δg→X3Σ−g magnetic dipole transition of S2 have been observed in the near-infrared spectral region near 4400 cm−1. The S2 molecules were generated in a fast-flow system by passing Sx or S2Cl2 vapor in Ar carrier gas through a microwave discharge and were excited by electronic-to-electronic energy transfer from metastable singlet oxygen O2(a1Δg). Medium-resolution spectra of the b1Σ+g→X3Σ−g and a1Δg→X3Σ−g transitions of S2 were measured with a Fourier-transform spectrometer. By comparing the bandshape of the 0-0 band of the a→X system with a computer simulation calculated with literature data of the rotational constants of the X and a states, the origin of the 0-0 band was determined to be ν0=4394.25±0.2 cm−1. |
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Keywords: | Sulfur dimer Metastable states Magnetic dipole transitions Fourier-transform spectroscopy Chemiluminescence |
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