FTIR SYNCHROTRON SPECTROSCOPY OF THE ASYMMETRIC C-H STRETCHING BANDS OF METHYL MERCAPTAN (CH3SH) – A PERPLEXITY OF PERTURBATIONS

2016 ◽  
Author(s):  
Ronald Lees ◽  
Brant Billinghurst ◽  
Sylvestre Twagirayezu ◽  
David Perry ◽  
Mahesh Dawadi ◽  
...  
Keyword(s):  
Methyl Mercaptan ◽  
Synchrotron Spectroscopy

Synchrotron spectroscopy of the CSH-bending and CH3-rocking bands of methyl mercaptan

2020 ◽  
Vol 98 (6) ◽  
pp. 519-529
Author(s):  
R.M. Lees ◽  
E.M Reid ◽  
Li-Hong Xu ◽  
B.E. Billinghurst
Keyword(s):  
Ground State ◽  
Vibrational Mode ◽  
Good Representation ◽  
Methyl Mercaptan ◽  
Vibrational Modes ◽  
Oscillatory Structure ◽  
Out Of Plane ◽  
Type Character ◽  
Fourier Transform Spectra ◽  
Synchrotron Spectroscopy

The CSH-bending and CH3-rocking infrared bands of CH3SH have been investigated in Fourier transform spectra recorded at 0.001 cm−1 resolution employing synchrotron radiation at the Canadian Light Source in Saskatoon. The relative band strengths and structures are quite different from those of the CH3OH methanol analogue, with the CSH bend being very weak and both the in-plane and out-of-plane CH3 rocks being strong with intensities greater than the C–S stretch. The CSH bend has parallel a-type character with no detectable b-type component. The out-of-plane CH3 rock is a purely c-type perpendicular band, whereas the in-plane rock is of mixed a/b character. Sub-bands have been assigned for A and E torsional species up to about K = 10 for each vibrational mode, providing upper-state term values from which K-reduced substate origins were determined. For the CSH bend, the origins follow the customary oscillatory torsional pattern as a function of K with a sharply reduced amplitude of 0.362 cm−1 compared to the 0.653 cm−1 for the ground state. The torsional energy curves for the out-of-plane rock are also well-behaved but have inverted ordering of the A–E torsional splitting components and a larger amplitude of 1.33 cm−1. In contrast, the substate origins for the in-plane rock are scattered over a range of about 2 cm−1 without clear oscillatory structure. Several instances of coupling among the lower modes and the ground state via resonances between accidentally near-degenerate levels have been observed and characterized. Ab initio calculations are found to give a good representation of the frequency and relative intensity patterns for the lower vibrational modes.

Terahertz and far-infrared synchrotron spectroscopy and global modeling of methyl mercaptan, CH332SH

2012 ◽  
Vol 137 (10) ◽  
pp. 104313 ◽  
Author(s):  
Li-Hong Xu ◽  
R. M. Lees ◽  
G. T. Crabbe ◽  
J. A. Myshrall ◽  
H. S. P. Müller ◽  
...  
Keyword(s):  
Far Infrared ◽  
Methyl Mercaptan ◽  
Global Modeling ◽  
Synchrotron Spectroscopy

FTIR synchrotron spectroscopy of the S–H stretching fundamental of the 12CH332SH species of methyl mercaptan

2018 ◽  
Vol 116 (23-24) ◽  
pp. 3554-3563 ◽  
Author(s):  
R. M. Lees ◽  
Li-Hong Xu ◽  
S. Twagirayezu ◽  
D. S. Perry ◽  
M. B. Dawadi ◽  
...  
Keyword(s):  
Methyl Mercaptan ◽  
Synchrotron Spectroscopy

Promoted adsorption of methyl mercaptan by γ-Al2O3 catalyst loaded with Cu/Mn

2021 ◽  
Vol 21 ◽  
pp. 101349
Author(s):  
Honghong Yi ◽  
Tao Tao ◽  
Shunzheng Zhao ◽  
Qingjun Yu ◽  
Fengyu Gao ◽  
...  
Keyword(s):  
Methyl Mercaptan ◽  
Al2o3 Catalyst

Solvent‐Free Single‐Pot Mannich Reaction and Detoxification of Industrial Hazardous Waste Methyl Mercaptan Gas

2021 ◽  
Vol 6 (5) ◽  
pp. 1088-1092
Author(s):  
Sharada Prasanna Swain ◽  
Nagendra Prasad ◽  
Latchi Reddy ◽  
G. Subrahmanyam ◽  
Sandeep Mohanty
Keyword(s):  
Hazardous Waste ◽  
Mannich Reaction ◽  
Solvent Free ◽  
Methyl Mercaptan
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