Raman spectrum of ammonium di-hydrogen phosphate

Abstract

Using the λ2536·5 mercury resonance radiation as exciter, the Raman spectrum of ammonium di-hydrogen phosphate has been investigated. The spectrum consists of 20 lines of which (1) 4 are lattice lines, (2) 8 are due to internal oscillations of the PO₄ group and (3) 8 due to NH₄ groups. The continuous distribution of intensity in the lattice spectrum indicates the possibility of the existence of hindered rotation of the NH₄ and PO₄ groups. The splitting up of some of the degenerate lines of both PO₄ and NH₄ groups might be due to the strong influence of the hydrogen bonds.