High-resolution IR spectroscopy of dimers of HDO with H2O in helium nanodroplets

Gutberlet A.; Schwaab G.; Havenith M.

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High-resolution IR spectroscopy of dimers of HDO with H2O in helium nanodroplets

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We report on rotationally resolved IR spectra of dimers of HDO as a deuterium (d) donor with H_2O, HDO, and D_2O embedded in superfluid Helium nanodroplets in the 2650-2660 and 2725-2740 cm~(-1) regions of the O-D donor stretch and symmetric acceptor stretch vibrations, respectively. By comparing spectra at different levels of deuteration we were able to unambiguously assign the donor stretch signals of H_2O· · ·DOH, HDO· · · DOH, and D _2O· · · DOH. For H_2O· · · DOH, three ΔK_a = 0 sub-bands were found that were assigned to transitions from the lower and upper acceptor switching states of Ka = 0 and the lower acceptor switching state of K_a = 1. In addition, b- and c-type transitions in the acceptor stretch region of HDO· · ·DOH were observed that allowed us to determine the acceptor switching splitting of Δ? = 5.68 cm~(-1) in the HDO· · ·DOH vibrational ground state. We suggest that the dominating broadening mechanism is intervibrational relaxation due to coupling of the rovibrational levels of the chromophore via internal droplet excitations.

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《The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory》 |2011年第23期|6297-6305|共9页
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Gutberlet A.; Schwaab G.; Havenith M.;
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Department of Physical Chemistry II, Ruhr-University Bochum, Germany;

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正文语种英语
中图分类物理化学（理论化学）、化学物理学;
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High-resolution IR spectroscopy of dimers of HDO with H2O in helium nanodroplets

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