Near infrared diode laser cw slit jet investigations of O13C:HCl, 14N2:HBr and OC:HBr

Application of near infrared diode laser spectroscopy for enhanced investigation of neutral closed shell molecular complexes is reported. The capabilities of high-frequency wavelength modulation with second derivative absorption detection using a cw supersonic slit jet expansion are demonstrated by an investigation of the previously unrecorded n1 K ¼ 2ˆ1 P1ðJÞ and P2ðJÞ transitions of OC:Ar with transitions having signal-to-noise ratios up to 103:1. Subsequently, rovibrational analyses are reported for the hydrogen-bonded interactions: (i) n1 O13C–H35Cl and O13C–H37Cl in natural abundance; (ii) analysis of a Coriolis perturbation in J0 ¼ 19 of n1 excited state in 14N2–HBr; (iii) n1; n2 þn15 ; n2 þn15 2n15 in OC–H79Br and OC–H81Br, and generation of rovibrational parameters for the ground-state low frequency intermolecular vibrational n15 : q 2003 Elsevier B.V. All rights reserved.