Raman matrix isolation spectroscopy of hydrogen. 4. Rotational and vibrational spectra of monomeric species and aggregation processes in solid nitrogen
- Universite Pierre et Marie Curie, Paris (France)
The rotational and vibrational Raman spectra of H{sub 2}, D{sub 2}, and HD trapped in solid nitrogen have been recorded at 9 K. After deposition, monomeric species are identified by either one Q(0) (HD) or two Q(J), J = 0 and 1, (H{sub 2}, D{sub 2}) lines. The corresponding S{sub 0}(J) rotational transitions display a doublet pattern with a splitting ranging from 22 to 26 cm{sup {minus}1}. After annealing at about 25 K, totally different spectra are observed. In the Q(J) region the new features behave as those obtained in the same conditions in rare gas matrices while the S{sub 0}(J) transitions are identified as single but broad lines with frequencies close to that of the free molecules and line widths strongly decreasing upon increase in temperature. These results suggest that hydrogen, because of its mobility and its low solubility in N{sub 2}, migrates in annealing conditions and forms microcrystals with spectral properties comparable to those observed for the crystalline phase.
- OSTI ID:
- 6439320
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:17; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ANNEALING
DEUTERIUM
ELEMENTS
HEAT TREATMENTS
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPES
LASER SPECTROSCOPY
LIGHT NUCLEI
MATRIX ISOLATION
NITROGEN
NONMETALS
NUCLEI
ODD-ODD NUCLEI
RAMAN SPECTROSCOPY
SPECTROSCOPY
STABLE ISOTOPES
ULTRALOW TEMPERATURE