Journal of Chemical Physics, Vol.101, No.6, 4593-4598, 1994
Rovibrationally Resolved, Fourier-Transform Near-Infrared Spectroscopy of the Nu(1) and Nu(2) Vibrations of the HCl Dimer in a Supersonic Jet
We have recorded the high-resolution (0.007 cm(-1)) Fourier-transform near infrared absorption spectrum of the symmetric Cl-35-Cl-35, and the mixed Cl-35-Cl-37 isotopomers of the hydrogen chloride dimer in a supersonic jet. The spectrum was recorded under a low effective rotational temperature (approximate to 20 K). Rovibrational analysis of the observed spectra has been performed for the K"(a)=0 subbands of the nu(1)(+) and nu(1)(-) perpendicular-type bands centered at 2890 and 2879 cm(-1) respectively. The K"(a)=0 and 1 parallel-type subbands of the nu(2)(-) at 2839 cm(-1) and nu(2)(+) at 2857 cm(-1) have also been analyzed. Furthermore, we have observed and investigated the (H Cl-35)(2) nu(1)(+), K"(a)=1, Delta K= -1 rovibrational transition centered near 2869 cm(-1). The results are compared with spectra previously recorded using difference frequency tunable laser spectrometers both in a supersonic slit jet and in an equilibrium gas phase mixture to demonstrate the advantages and limitations of the FTIR technique.