Polarized IR and Raman spectra of zoisite: insights into OH-dipole orientation and the luminescence
Weis, Franz A.; Lazor, Peter; Skogby, Henrik; Stalder, Roland; Eriksson, Lars
European Journal of Mineralogy Volume 28 Number 3 (2016), p. 537 - 543
published: Jun 1, 2016
ArtNo. ESP147052803002, Price: 29.00 €
The OH-dipole in the mineral zoisite has been a topic of discussion regarding its general orientation and vibrational modes. We present new polarized single-crystal Raman and infrared spectra and verify the orientation of the OH-dipole along the crystallographic c axis with a slight deviation towards the crystallographic a axis. Polarized Raman and FTIR spectra confirm that the OH-band at 3150 cm-1 corresponds to the O(10)-H. . . O(4) hydrogen bridge and exclude a previously suggested second hydrogen bridge O(10)-H. . . O(2). Further, Raman spectra provide insights on the luminescence of zoisite and the interference of luminescence peaks in the OH-region.