Lattice modes of solid nitrogen to 104 GPa

Abstract

Lattice modes of solid nitrogen were studied by Raman spectroscopy at room

temperature to 104 GPa using the diamond anvil technique. Changes in the lattice mode

spectral features correlate with those observed in the vibronic spectra suggesting symmetry

changes of the crystal lattice. The changes in the spectral features mainly appear as

branchings of existing modes supporting the view of a close structural relationship among

these high pressure phases.