High resolution infrared study of the parallel band nu(3) of chloroform (CHCl3)-Cl-35

The infrared spectrum of chloroform in the region of the parallel fundament al band nu(3) around 367 cm(-1) has been measured with a Fourier spectromet er at a resolution of 0.001 cm(-1). An isotopically pure sample of (CHCl3)- Cl-35 was used. More than 5000 lines were assigned in the nu(3) band. A rea nalysis of the ground state constants was performed by combining 1671 combi nation differences from this work, 712 differences from a previous study of the nu(2) band, and 80 millimetre wave lines from the literature. In the a nalysis of the nu(3) band, a model of an unperturbed symmetric top band was applied. The data were fitted with a standard deviation of 0.18 x 10(-3) c m(-1), and the following leading parameters were obtained: nu(0) = 367.2955 50(8) cm(-)1, B-3 - B-0 = -77.058(4) x 10(-6) cm(-1) and C-3 - C-0 = -18.60 0(11) x 10(-6) cm(-1). In addition, several hot bands have been studied. Th e isotopic effects were studied also by analysing spectra of the isotopical ly natural sample.