Vibration plus libration absorption bands of OH centres in LiNbO3

Autor(en): Grone, A
Kapphan, S
Stichwörter: DIFFUSION; LiNbO3; Nuclear Science & Technology; OH defect centers; Physics; Physics, Condensed Matter; Physics, Fluids & Plasmas; PROTON; vibration + libration absorption bands; WAVE-GUIDES; WAVEGUIDES
Erscheinungsdatum: 1995
Herausgeber: GORDON BREACH SCI PUBL LTD
Journal: RADIATION EFFECTS AND DEFECTS IN SOLIDS
Volumen: 134
Ausgabe: 1-4
Startseite: 283
Seitenende: 286
Zusammenfassung: 
Hydrogen centres in the bulk of stoichiometric (VTE) LiNbO3 exhibit a sharp absorption band of the OH(OD) stretching vibration near 3466 (2562) cm(-1). In congruent LiNbO3 the OH band (<(v)over bar (max)> = 3484cm(-1)) is rather broad (FWHM similar to 30 cm(-1)) and for the high proton concentration layers in proton exchanged LiNbO3:PE the broad absorption band (FWHM similar to 30 cm(-1)) is shifted to about 3507 cm(-1). For all the above bands which are completely polarized perpendicular (z) over right arrow weak high energy sidebands have been found, shifted by about 950 cm(-1) for OH and 700 cm(-1) for OD with respect to the position of the stretching vibration. The intensity of these sidebands and their spectral form is found to be proportional to the stretching vibration, respectively to the concentration of the H(D) centres. These sidebands are identified as libration vibration combination bands and display the polarization dependence (I-parallel to/I-perpendicular to approximate to 0.5 for OH with respect to (z) over right arrow) of a three-dimensional oscillator. The libration vibration combination bands have also been detected as sidebands to higher vibrational transitions in proton (deuteron) exchanged LiNbO3:PE(DE).
Beschreibung: 
7th Europhysical Conference on Defects in Insulating Materials (Eurodim 94), ECOLE NORMALE SUPIRIEURE LYON, LYON, FRANCE, JUL 05-08, 1994
ISSN: 10420150
DOI: 10.1080/10420159508227231

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