Raman matrix isolation spectroscopy of dihydrogen. II. Aggregation processes in argon
- Laboratoire de Spectrochimie Moleculaire (CNRS, UA 508) Universite Pierre et Marie Curie, 4 Place Jussieu 75252 Paris Cedex 05, France (FR)
The vibrational spectra of H{sub 2}, D{sub 2}, and HD trapped in solid argon were examined as a function of concentration and sample annealing. Before annealing, increasing the hydrogen concentration only leads to an asymmetrical broadening and a small blue shift of the {ital Q}( {ital J}) lines assigned to monomeric species. These observations are believed due to formation of low stoichiometry aggregates. After annealing above 35 K, new features---10 cm{sup {minus}1} blue shifted with respect to monomer and small aggregate lines---appear with properties comparable to those reported for solid dihydrogen at 2 K. Force field calculations on aggregates involving two to six molecules (including ortho/para and isotopic mixtures) allow a semiquantitative interpretation of the experimental data, and suggest an aggregation degree larger than six. Finally it is concluded that a possible interpretation of all the data is the formation of microcrystals upon annealing, tied to the low solubility and the high mobility of dihydrogen in solid argon.
- OSTI ID:
- 6982177
- Journal Information:
- Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 92:1; ISSN JCPSA; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
AGGLOMERATION
ARGON
DEUTERIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MATERIALS
MATRIX ISOLATION
MATRIX MATERIALS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
RAMAN SPECTRA
RARE GASES
SPECTRA
SPECTRAL SHIFT
STABLE ISOTOPES
TRAPPING
VIBRATIONAL STATES