High resolution infrared spectra of H2–Kr and D2–Kr van der Waals complexes.

Infrared spectra of weakly bound hydrogen–krypton complexes have been studied at high spectral resolution (0.04 cm^-1) using a long-path (154 m) low temperature (100 K) absorption cell and a Fourier transform spectrometer. In addition to spectra from the regions of the H₂ and D₂ fundamental vibrational bands in the midinfrared, the results also include the region of the pure rotational S₀(0) transition of H₂ in the far infrared. A total of 219 measured line positions from these spectra have been fully assigned to specific quantum transitions and form the basis for determining a greatly improved semiempirical three-dimensional intermolecular potential energy surface for hydrogen–krypton in an accompanying paper. [ABSTRACT FROM AUTHOR]