SLIT JET INFRARED-ABSORPTION SPECTROSCOPY OF N-2-HCL COMPLEXES

The vibration-rotation spectra of the weakly bound complexes N-2-HCl h ave been studied in the 3.5 mu m region of the nu(1) fundamental band correlated with the HCl stretch, using a pulsed slit jet expansion and a tunable diode laser spectrometer. For the first time the nu(1) band for the N-2-(HCl)-Cl-37 isotope has been analysed and the rotational constants determined. The nu(1) band was observed previously for the N -2-(HCl)-Cl-35 isotope using a cooled long path cell and a Fourier tra nsform spectrometer. This band has been re-examined to confirm and ext end this analysis, with new lines corresponding to low J values observ ed and assigned. The rotational molecular constants are in agreement w ith those determined already, but for the band centre the value found was slightly greater than those obtained previously. For both isotopes , the observed spectra confirm the quasilinear geometry of the complex .