HIGH-RESOLUTION SYNCHROTRON INFRARED SPECTROSCOPY OF THIOPHOSGENE: THE _1, _5, 2_4, and _2 + 2_6 bands

Thiophosgene (chem{Cl_2CS}) is a favorite model system for studies of photophysics, vibrational dynamics, and intersystem interactions. But at high resolution its infrared spectrum is very congested due to hot bands and multiple isotopic species. Previously, we reported the first high resolution IR study of this molecule, analyzing the nub{2} (504 wn) and nub{4} (471 wn) fundamental bands.footnote{A.R.W. McKellar, B.E.Billinghurst, J. Mol. Spectrosc. textbf{260}, 66 (2010).} Here we continue, with analysis of the nub{1} (1139 wn) and nub{5} (820 wn) fundamentals for the two most abundant isotopologues, $^{35}$Cl$_{2}$CS and $^{35}$Cl$^{37}$ClCS, based on spectra with a resolution of about 0.001 wn obtained at the Canadian Light Source far-infrared beamline using synchrotron radiation and a Bruker IFS125 Fourier transform spectrometer. The nub{2} + nub{4} (942 wn) and nub{2} + 2nub{6} (1104 wn) bands are also studied here. But so far the nub{2} + nub{6} combination band (795 wn) resists analysis, as do the weak nub{3} (292.9 wn) and nub{6} ($approx$300? wn) fundamentals