Abstract

<b>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 refractive-index-matched chloroform as an internal standard to determine the solid-state 995 cm<sup>−1</sup> Na<sub>2</sub>SO<sub>4</sub> 244 nm Raman cross-sections. The pure liquid chloroform 668 cm<sup>−1</sup> 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<sup>−1</sup> SO<sub>4</sub><sup>2−</sup> band of 1.97 ± 0.07 × 10<sup>−28</sup> cm<sup>2</sup>/(molc·sr) is about half of its aqueous solution Raman cross-section, indicating interactions between the sulfate species in the solid that decrease the Raman polarizability.</b>

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