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Dynamics of water molecules in an alkaline environment

Nienhuys, Han-Kwang LU ; Lock, AJ; van Santen, RA and Bakker, HJ (2002) In Journal of Chemical Physics 117(17). p.8021-8029
Abstract
We report on a two-color mid-infrared pump-probe spectroscopic study of the dynamics of the OH stretch vibrations of HDO molecules dissolved in a concentrated (10 M) solution of NaOD in D2O. We observe that spectral holes can be created in the broad OH stretch absorption band that change neither position nor width on a picosecond time scale. This behavior differs strongly from that of pure HDO:D2O where rapid spectral diffusion (tau(c)approximate to600 fs) occurs. The long-living inhomogeneity indicates that a concentrated aqueous NaOX (X=H,D) solution has a very static hydrogen-bond network. The results also show that the absorption band of the OH stretch vibration consists of two separate classes of OH groups with very different... (More)
We report on a two-color mid-infrared pump-probe spectroscopic study of the dynamics of the OH stretch vibrations of HDO molecules dissolved in a concentrated (10 M) solution of NaOD in D2O. We observe that spectral holes can be created in the broad OH stretch absorption band that change neither position nor width on a picosecond time scale. This behavior differs strongly from that of pure HDO:D2O where rapid spectral diffusion (tau(c)approximate to600 fs) occurs. The long-living inhomogeneity indicates that a concentrated aqueous NaOX (X=H,D) solution has a very static hydrogen-bond network. The results also show that the absorption band of the OH stretch vibration consists of two separate classes of OH groups with very different vibrational lifetimes. For component I, the lifetime of the OH stretch vibration is similar to600 fs and increases with OH frequency, which can be explained from the accompanying decrease in the strength of the hydrogen-bond interaction. This component represents HDO molecules of which the OH group is bonded to a D2O molecule via a DO-H.OD2 hydrogen bond. For component II, the lifetime is similar to160 fs, and does not show a significant frequency dependence. This component represents HDO molecules that are hydrogen bonded to a D2O molecule or an OD- ion. The short, frequency-independent vibrational lifetime of component II can be explained from the participation of the HDO molecule and its hydrogen-bonded partner in deuteron and/or proton-transfer processes. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Chemical Physics
volume
117
issue
17
pages
8021 - 8029
publisher
American Institute of Physics
external identifiers
  • wos:000178625500024
  • scopus:0036849849
ISSN
0021-9606
DOI
10.1063/1.1510670
language
English
LU publication?
no
id
aee68746-152f-4eee-aca9-8044f83139ea (old id 325615)
date added to LUP
2007-11-19 16:36:49
date last changed
2017-06-18 03:30:03
@article{aee68746-152f-4eee-aca9-8044f83139ea,
  abstract     = {We report on a two-color mid-infrared pump-probe spectroscopic study of the dynamics of the OH stretch vibrations of HDO molecules dissolved in a concentrated (10 M) solution of NaOD in D2O. We observe that spectral holes can be created in the broad OH stretch absorption band that change neither position nor width on a picosecond time scale. This behavior differs strongly from that of pure HDO:D2O where rapid spectral diffusion (tau(c)approximate to600 fs) occurs. The long-living inhomogeneity indicates that a concentrated aqueous NaOX (X=H,D) solution has a very static hydrogen-bond network. The results also show that the absorption band of the OH stretch vibration consists of two separate classes of OH groups with very different vibrational lifetimes. For component I, the lifetime of the OH stretch vibration is similar to600 fs and increases with OH frequency, which can be explained from the accompanying decrease in the strength of the hydrogen-bond interaction. This component represents HDO molecules of which the OH group is bonded to a D2O molecule via a DO-H.OD2 hydrogen bond. For component II, the lifetime is similar to160 fs, and does not show a significant frequency dependence. This component represents HDO molecules that are hydrogen bonded to a D2O molecule or an OD- ion. The short, frequency-independent vibrational lifetime of component II can be explained from the participation of the HDO molecule and its hydrogen-bonded partner in deuteron and/or proton-transfer processes.},
  author       = {Nienhuys, Han-Kwang and Lock, AJ and van Santen, RA and Bakker, HJ},
  issn         = {0021-9606},
  language     = {eng},
  number       = {17},
  pages        = {8021--8029},
  publisher    = {American Institute of Physics},
  series       = {Journal of Chemical Physics},
  title        = {Dynamics of water molecules in an alkaline environment},
  url          = {http://dx.doi.org/10.1063/1.1510670},
  volume       = {117},
  year         = {2002},
}