The microwave spectrum of dichlorosilylene (SiCl2) in excited vibrational states
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Abstract:

AbstractThe microwave spectrum of dichlorosilylene in excited vibrational states has been measured in the millimetre- and submillimetre-wave regions. Rotational and centrifugal distortion constants were determined for the ν1, ν2, 2ν2 and ν3 excited states of the Si35Cl2 isotopic species and for the ν2 and 2ν2 states of Si35Cl37Cl. Analysis of the Coriolis resonance between the ν1 and ν3 states of Si35Cl2 yielded values of the D Coriolis interaction constant with F constrained, of two higher-order terms and also an accurate value [5.402338(95) cm−1] of the energy difference between the two excited vibrational states. The rotational constants of Si35Cl2 in the first excited states of the three normal vibrations were combined with those of the ground vibrational state reported in a previous paper [M. Tanimoto et al., J. Chem. Phys. 91, 2102 (1989)] to obtain the equilibrium structure, harmonic and cubic/third-order anharmonic potential constants.

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