Singlet–triplet perturbations in the à 1A2 (v=0) state of thioformaldehyde

Extensive singlet–triplet perturbations have been observed in the 0–0 band of the A 1A2–X 1A1 system of H2CS with energy displacements up to about 0.4 cm−1. The singlet–triplet nature of the perturbation has been confirmed by high resolution magnetic rotation studies and by laser excitation studies in the presence of a magnetic field. The J and Ka dependence of the perturbation matrix elements has been shown to be consistent with a vibronic spin‐orbit mechanism. The coupling is predominantly to the F1 components of the 4361 level of the a 3A2 state.

[1]  D. Clouthier,et al.  High resolution absorption and magnetic rotation studies of the system of formaldehyde-d1 , 1983 .

[2]  D. Moule,et al.  The magnetic rotation spectrum of formaldehyde: singlet–triplet perturbations in the 2141, 2143, 2243, and 2341 levels of the à lA2 state of H2CO , 1983 .

[3]  D. Clouthier,et al.  The magnetic rotation spectrum of thioformaldehyde: singlet–triplet perturbations in the Ã1A2 state , 1982 .

[4]  P. Jensen,et al.  The geometry and the out-of-plane bending potential function of thioformaldehyde in the Ã1A2 and ã3A2 electronic states , 1982 .

[5]  S. Harris,et al.  Continuous wave intracavity dye laser spectroscopy. II. A parametric study , 1981 .

[6]  D. Clouthier,et al.  Single rotational level resonance fluorescence of thioformaldehyde , 1981 .

[7]  G. W. King,et al.  The ã3A2 ← X̃1A1 absorption spectrum of thioformaldehyde: A vibrational and rotational analysis , 1980 .

[8]  G. W. King,et al.  Thioformaldehyde: Rotational analyses of the Ã1A2-X̃1A1 visible absorption system , 1979 .

[9]  S. M. Till,et al.  Magnetic optical activity in the Ã1A2-X̃1A1 system of formaldehyde-d2 , 1979 .

[10]  S. M. Till,et al.  THE MAGNETIC ROTATION SPECTRUM OF FORMALDEHYDE: SINGLET-TRIPLET PERTURBATIONS IN THE $4^{1}$ and $4^{3}$ LEVELS OF THE $A^{1} A_{2}$ STATE OF $H_{2}CO$ , 1979 .

[11]  G. W. King,et al.  Thioformaldehyde: Vibrational analysis of the Ã1A2-X̃1A1 visible absorption system , 1979 .

[12]  S. M. Till,et al.  Further high resolution studies of the system of formaldehyde , 1978 .

[13]  S. M. Till,et al.  Singlet-triplet perturbations in formaldehyde , 1978 .

[14]  W. Gelbart,et al.  Nonradiative electronic relaxation under collision-free conditions , 1977 .

[15]  C. Lauro,et al.  The Zeeman effect in triplet states of rotating asymmetric molecules , 1975 .

[16]  J. Brand,et al.  Singlet-triplet intersystem coupling in formaldehyde , 1974 .

[17]  J. Brand,et al.  Singlet-triplet resonance interaction of the Ã1A″ and ã3A″ states of propynal☆ , 1974 .

[18]  C. G. Stevens,et al.  Analysis of some singlet‐triplet perturbations in the 1A2 state of formaldehyde , 1973 .

[19]  C. G. Stevens,et al.  Angular momentum dependence of first‐ and second‐order singlet‐triplet interactions in polyatomic molecules , 1973 .

[20]  F. W. Birss,et al.  Molecular constants for the ã 3A2 state of formaldehyde , 1973 .

[21]  W. Ware,et al.  Creation and detection of the excited state , 1971 .

[22]  D. Ramsay,et al.  The magnetic rotation spectrum of glyoxal , 1970 .

[23]  S. McGlynn,et al.  Molecular Spectroscopy of the Triplet State. , 1969 .

[24]  W. T. Raynes.  Spin Splittings and Rotational Structure of Nonlinear Molecules in Doublet and Triplet Electronic States , 1964 .

[25]  G. Herzberg,et al.  Spectra of diatomic molecules , 1950 .

[26]  Edward Teller,et al.  Electronic Spectra of Polyatomic Molecules , 1941 .