Raman studies of hydrogen trapped in As4O6·2H2at high pressure and low temperature

Piotr Guńka , L Zhu , Timothy A. Strobel , Janusz Zachara

Abstract

Raman spectroscopic measurements of the arsenolite-hydrogen inclusion compound As4O6·2H2 were performed in diamond anvil cells at high pressure and variable temperature down to 80 K. The experimental results were complemented by ab initio molecular dynamics simulations and phonon calculations. Observation of three hydrogen vibrons in As4O6·2H2 is reported in the entire temperature and pressure range studied (up to 24 GPa). While the experiments performed with protium and deuterium at variable temperatures allowed for the assignment of two vibrons as Q1(1) and Q1(0) transitions of ortho and para spin isomers of hydrogen trapped in the inclusion compound, the origin of the third vibron could not be unequivocally established. Low-temperature spectra revealed that the lowest-frequency vibron is actually composed of two overlapping bands of Ag and T2g symmetries dominated by H2 stretching modes as predicted by our previous density functional theory calculations. We observed low-frequency modes of As4O6·2H2 vibrations dominated by H2 "librations,"which were missed in a previous study. A low-temperature fine structure was observed for the J = 0 → 2 and J = 1 → 3 manifolds of hydrogen trapped in As4O6·2H2, indicating the lifting of degeneracy due to an anisotropic environment. A non-spherical distribution was captured by molecular dynamics simulations, which revealed that the trajectory of H2 molecules is skewed along the crystallographic «111»direction. Last but not least, low-temperature synchrotron powder x-ray diffraction measurements on As4O6·2H2 revealed that the bulk structure of the compound is preserved down to 5 K at 1.6 GPa.
Author Piotr Guńka (FC / CofIC)
Piotr Guńka,,
- Chair Of Inorganic Chemistry
, L Zhu
L Zhu,,
-
, Timothy A. Strobel
Timothy A. Strobel,,
-
, Janusz Zachara (FC / CofIC)
Janusz Zachara,,
- Chair Of Inorganic Chemistry
Journal seriesJournal of Chemical Physics, ISSN 0021-9606, e-ISSN 1089-7690, [1089-7690]
Issue year2020
Vol153
No5
Pages054501-1-054501-8
Publication size in sheets0.3
Article number0017892
ASJC Classification1606 Physical and Theoretical Chemistry; 3100 General Physics and Astronomy
DOIDOI:10.1063/5.0017892
Languageen angielski
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 25-08-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 0.969; WoS Impact Factor: 2018 = 2.997 (2) - 2018=2.84 (5)
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