The rotation and inversion of normal and deuterated ammonia in inert matrices

The infrared spectrum of NH3-dn trapped in solid neon

“…The analysis of these absorptions reported in the present study tests the hypotheses proposed in the earlier assignment [4] of the absorption in the m 2 spectral region of NH 3 trapped in solid neon and offers assignments for the higher frequency fundamentals of NH 3 and for most of the fundamentals of NH 3 -d n .…”

“…The assignments proposed in Table 1 for some of the transitions arising from J ¼ 1 levels differ from those in the previous study [4]. A weak to moderately intense peak was resolved at 964.2 cm À1 in the present experiments.…”

“…Two structured absorptions, with maxima at 961.0 and 968.2 cm À1 , are candidates for assignment to that transition. As in the earlier study [4], both absorptions are assigned to the m 2 a R(0,0) transition, presuming that NH 3 is trapped in two major sites in solid Ne. The designation of sites of type I and II corresponds to that used in the earlier study, with site I absorptions appearing at higher frequencies than their site II counterparts.…”

“…An earlier study [4] analyzed the absorption patterns for all of the vibrational fundamentals of NH 3 -d n isolated in an argon matrix, but only that for m 2 of NH 3 trapped in a neon matrix, the solid medium in which molecules generally most closely approach their gas-phase behavior. In both argon and neon, small perturbations were observed for the J ¼ 1 levels, and the inversion splitting was reduced to approximately three-fourths of its gas-phase magnitude.…”

Proton Transfer in Strong Hydrogen Bonds Revealed by Infrared Spectra - Correlations between Structure and Spectra for the BrH : NH3Complex

“…The frequencies of these bands are distinctly different from the well known frequencies of dimers and higher aggregates of NH 3 or of BrH in an Ar matrix (studied and assigned by several authors (e.g. [16,17,5] and references therein)).…”