The 4th International Conference on Matter and Radiation at Extremes (ICMRE 2019)

451 / 2019-03-08 14:59:57

Low-temperature Raman Spectroscopy of cg-N and λ-N

Raman spectroscopy; Polymeric nitrogen; high pressure and low temperature, multi-phonon model

Plenary track > High Pressure Physics and Materials Science

Nitrogen has attracted considerable attention in recent years. We studied nitrogen at high pressure and low temperature using a self-designed high-pressure cryogenic device. The vibrational properties of cubic polymeric cubic gauche nitrogen (cg-N) lattices were firstly studied at different pressures by the low-temperature Raman spectroscopy (173-300 K). Our results indicate that the three-phonon decay processes were dominated over the four-phonon ones at low temperatures for cg-N. We also synthesized the λ-N at low temperature (77 K) and high pressure, and probe the vibrational properties over the range of pressure from 1 to 140 GPa.