Физика Низких Температур: Том 27, Выпуск 9-10 (Сентябрь 2001), c. 1170-1174    ( к оглавлению , назад )

Vibrational dynamics of solid molecular nitrogen to megabar pressures

A. F. Goncharov, E. Gregoryanz, H.-K. Mao, and R. J. Hemley

Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington 5251 Broad Branch Road, N. W., Washington, D. C. 20015
E-mail: goncharov@gl.ciw.edu

Received July 2, 2001


We report the results of Raman and synchrotron infrared absorption measurements of several molecular phases of solid nitrogen to pressures above 100 GPa (300 K). Low-temperature vibrational spectra to 45 GPa are also presented. The changes in Raman and infrared spectra at 60 GPa and 300 K are interpreted as arising from the e z transition reported at low temperature. The character of splitting of the Raman vibron n2 observed at 25 GPa and low temperatures differs from that previously reported, a difference that we ascribe to different experimental procedures employed and metastability of the low-temperature phase.

62.50.+p - High-pressure and shock wave effects in solids and liquids (for high pressure apparatus and techniques, see 07.35.+k; for shock wave initiated high-pressure chemistry, see 82.40.Fp; for high-pressure behavior of rocks and minerals, see 91.60.Gf; see also
78.30.-j - Infrared and Raman spectra (for vibrational states in crystals and disordered systems, see 63.20.-e and 63.50.+x respectively)