Title Infrared and Raman studies of hydroxide ions in NaCl extended to $H\rightarrow D$ and $^{16}O\rightarrow^{18}O$ isotope exchange Author Gustin, E. Bouwen, A. Schoemaker, D. An, C.P. Luty, F. Faculty/Department Faculty of Sciences. Physics Publication type article Publication 2001 Lancaster, Pa , 2001 Subject Physics Source (journal) Physical review: B Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015 Volume/pages 63(2001) :13 , p. 1-13 ISSN 1098-0121 1550-235X Article Reference 134301 Carrier E-only publicatie Target language English (eng) Full text (Publishers DOI) Affiliation University of Antwerp Abstract Substitutional OH- and OD- defects in NaCl have been studied with Fourier-transform infrared (FTIR) and polarized Raman-scattering (RS) spectroscopy. For the first time, the motional levels of the OH- were clearly resolved in their stretch-mode (SM) absorption spectra, showing no change in splitting under (OH-)-O-16 --> (OH-)-O-18 isotope exchange. Due to extremely small oscillator strengths, the first harmonic SM absorptions of (OD-)-O-16 and (OD-)-O-18 defects were not detectable. In contrast to this, the almost equal RS strengths of OH- and OD- defects permitted their detailed comparative investigation with polarized Raman scattering. The resulting low-frequency motional levels of OD- in both ground and excited SM states are found to be quite different from those of OH- and are hard to reconcile with some of the existing models. A reasonably good fit of the OH- and OD- data can be achieved with a simple V-4 Devonshire model; this suggests hindered rotation of a strongly off-center shifted center of mass in a potential with smaller energy barriers for OD- compared to OH-. Despite the unexplained weakness of the first harmonic SM absorption of OD-, phonon and librational sidebands are observed with almost similar strength as those of OH-. Their symmetry was determined by polarized RS and/or FTIR absorption measurements under uniaxial stress alignment. The "normal" OH-/OD- isotope shift of the librational sideband and the observation of its second harmonic show that this angular motion occurs around the center of mass in a strong and nearly harmonic potential. Full text (open access) https://repository.uantwerpen.be/docman/irua/a342c9/6784.pdf E-info http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000167895000048&DestLinkType=RelatedRecords&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000167895000048&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 Handle