Neon matrix induced perturbations of weak hydrogen-bonded complexes. Part I. The N2–HF complex

Abstract

The infrared spectrum of the N₂–HF complex has been reinvestigated in neon matrices between 8000 and 20 cm⁻¹. Two distinct trapping sites are identified, distinguishable by annealing effects and characterized by 6 (site A) and possibly 7 (site B) vibrational transitions for various (H(D)F and ^(14–15)N₂) isotopic species. Careful examination of the far infrared allows the assignment of several intermolecular modes. For the N₂–HF complex in site B, which has properties closer to the gas phase, a complete set of frequencies and relative intensities are obtained and compared to the gas phase and argon matrix values as well as accurate ab initio calculations.