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Partial depolarization effect of high‐numerical‐aperture objectives on polarized microfocus Raman spectra of orthorhombic poly(oxymethylene) single crystal
Author(s) -
Morishita Hirofumi,
Hoshino Yoshimasa,
Higuchi Seiichiro,
Kaneko Fumitoshi,
Tashiro Kohji,
Kobayashi the late Masamichi
Publication year - 2000
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/1097-4555(200006)31:6<455::aid-jrs551>3.0.co;2-q
Subject(s) - raman spectroscopy , orthorhombic crystal system , depolarization , single crystal , materials science , depolarization ratio , crystal (programming language) , crystallography , spectral line , numerical aperture , analytical chemistry (journal) , chemistry , molecular physics , optics , nuclear magnetic resonance , crystal structure , physics , optoelectronics , biophysics , organic chemistry , programming language , astronomy , computer science , wavelength , biology
In microfocus Raman spectroscopic measurement of micron‐sized, moth‐shaped single crystal of orthorhombic pohombic poly(oxymethylene) (metastable phase), the partial depolarization caused by a sharp focusing with objectives of a high magnification was investigated in order to obtain the information about the vibrational assignments. Polarized microfocus Raman spectra in the frequency range covering molecular vibrations were compared before and after the introduction of an aperture in the collimating system. The spectral difference in the (YX) polarization was observed for the bands of A–B 1 and B 2 –B 3 split‐pairs, which indicated clearly that the scattering intensities of the B 2 modes as well as the A modes were decreased selectively by the introduction of the aperture. In the (XX), (YY), and (XY) spectra, the B 2 modes were observed as partial depolarization components of light for electric vector component along the depth direction. Utilizing these partial depolarization effects, it is possible to assign Raman‐active fundamentals and to decide the unit cell orientation of the micron‐sized, moth‐shaped single crystal of orthorhombic poly(oxymethylene). Copyright © 2000 John Wiley & Sons, Ltd.