High resolution IR spectroscopy of HDO and HDO(N2)n in helium nanodroplets

Abstract

We report on the IR-spectra of HDO and aggregates of HDO and N(2) embedded in superfluid helium nanodroplets in the region of the bound O-D stretch vibration. The R(0) transition 0(00)→1(01) of HDO was observed at 2738.157 50(7)cm(-1). The linewidth of this transition was determined to be 0.060(4)cm(-1). In HDO(N(2))(n) aggregates, the bound O-D stretch vibration was observed at 2732.36(1) and 2730.62(1)cm(-1) for n=1 and n=2, respectively. The line broadening amounts to 1.86(7) and 2.73(7)cm(-1), which correspond to lifetimes of 2.84(1) and 1.94(5) ps.

High-Resolution IR Spectroscopy of Dimers of HDO with H2O in Helium Nanodroplets

“…The insets show details of the spectral signature. In the range from 2727 to 2734 cm −1 (right inset) broad signals from HDO−nitrogen clusters and a sharp HDO monomer peak are also present that are described elsewhere . They have been subtracted in the upper trace of the inset.…”

“…In the latter region also the pure HDO@He species at 2738 cm −1 and broad features belonging to clusters of HDO with nitrogen around 2731 cm −1 have been identified. These data have been published elsewhere …”

“…In the range from 2727 to 2734 cm À1 (right inset) broad signals from HDOÀnitrogen clusters and a sharp HDO monomer peak are also present that are described elsewhere. 34 They have been subtracted in the upper trace of the inset. To obtain the symmetry species of the excited vibrational states, we followed the procedure described by Huang and Miller 27 based on symmetry species classification by Dyke.…”

“…These data have been published elsewhere. 34 The first step of the assignment of the remaining features is based on a comparison of spectra with different levels of deuteration. The lower and upper traces in the left inset of Figure 2 show the spectra of deuterated water dimer species at low and high D content, respectively.…”

The vibration-rotation-tunneling levels of N2–H2O and N2–D2O

“…In recent years, there has been a sustained attempt to understand the interaction between H 2 O and other small molecules. [1][2][3][4][5][6][7][8][9] Knowing these interactions may help us to understand hydration of molecules. In all of these complexes, the spectra are complicated by tunneling between two wells associated with structures obtained by permuting the H atoms of H 2 O.…”