Rotational Spectroscopic Investigations of CH_4 - H_2S Complex

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Microwave (Rotational)

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Recently, Raghavendra and Arunan [1] have shown that methane can form a hydrogen bonded complex with HX (X=F, Cl, OH, SH), in which H-X points towards the carbon of methane. Microwave spectroscopy has confirmed the structure of CH_4 - HF/HCl/H_2O complexes. No experimental data is available for CH_4 - H_2S complex to the best of our knowledge. Pulsed Nozzle Fourier Transform Microwave Spectrometer has been used to study the rotational spectrum of CH_4 - H_2S complex. Two progressions were observed. Both could be fitted independently to a linear top. The ground state rotational constant is determined to be B= 2683.100(1) MHz and the distortion constant to be D_J = 0.09413(9) MHz. Based on this rotational constant, the intermolecular separation is determined to be 4.136 Å. The other state has a rotational constant B =2593.05(1) MHz and a negative distortion constant, D_J = -0.0089(7) MHz. The negative distortion constant implies rotational - vibrational coupling and the progression arises from some excited internal rotor/torsional state. Experiments are in progress to look for more states and isotopologues of this complex. Details will be presented in the talk.
1.Raghavendra et al.Chem. Phys. Lett. 467(2008)37.

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