Abstract
The infrared spectra of five distinct species of N2O–hydrogen van der Waals complexes (N2O–paraH2, –orthoH2, –orthoD2, –paraD2, and –HD) were studied in the region of the ν1 fundamental band of N2O (≈2224 cm−1) by tunable diode laser spectroscopy in a pulsed supersonic jet expansion. The spectra corresponded to those of T-shaped asymmetric rotors with mainly a-type transitions (ΔKa=0), plus weaker b-type transitions (ΔKa=±1) in the case of N2O–D2. They were analyzed using a conventional Hamiltonian with quadratic centrifugal distortion parameters. The fitted rotational parameters were consistent with structures having intermolecular separations between 3.25–3.4 Å and angles of about 80° between the N2O axis and the hydrogen center-of-mass. These intermolecular distances are about 0.3 Å shorter than those observed previously for the related system, OCS–hydrogen. The band origins were blueshifted relative to the free N2O molecule by from +0.25 to +0.79 cm−1. These vibrational shifts showed regularities among the different spin and isotopic forms of hydrogen that were analogous to those in OCS–hydrogen.
Published Version
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