Wang, L and Asher, SA
(2012)
Refractive-index matching avoids local field corrections and scattering bias in solid-state Na <inf>2</inf>SO <inf>4</inf> ultraviolet Raman cross-section measurements.
Applied Spectroscopy, 66 (2).
157 - 162.
ISSN 0003-7028
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Abstract
We report a refractive-index matching method to measure nonabsorbing solid ultraviolet (UV) Raman cross-sections that avoids the local field correction and interface scattering of incident light. We used refractiveindex- matched chloroform as an internal standard to determine the solidstate 995 cm -1Na 2SO 4 244 nm Raman cross-sections. The pure liquid chloroform 668 cm -1 244 nm Raman cross-section was determined by using acetonitrile as an internal standard and by calculating the local field corrections for the observed Raman intensities. Our measured 244 nm UV Raman cross-section of the solid-state 995 cm -1 SO 42- band of 1.97 ±0.07 6 10 -28 cm2/(molc.sr) is about half of its aqueous solution Raman crosssection, indicating interactions between the sulfate species in the solid that decrease the Raman polarizability. © 2012 Society for Applied Spectroscopy.
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