Raman-spectral depolarisation ratios of ions in concentrated aqueous solution. The next-to-negligible effect of highly asymmetric ion surroundings on the symmetry properties of polarisability changes during vibrations of symmetrc ions. Ammonium sulphate and teramethylammonium bromide.
Depolarisation ratios ρ have been measured for the Raman spectra of solutions of composition (NH4)2 SO4 · 11H2O and (CH3)4NBr · 29D2O. Even though the former's vibration spectrum shows clear evidence of lowered ion symmetries (presence of ν1 of SO42-
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|Source:||Spectrochimica Acta: part A|