| Autor: |
Obriot, J., Fondere, F., Marteau, Ph. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 11/1/1986, Vol. 85 Issue 9, p4925, 7p |
| Abstrakt: |
By slowly cooling under pressure diluted solutions of HCl molecules in argon or krypton we have obtained different aggregation states of these molecules: dimers, trimers, and even aggregates and microcrystals. Thick solid samples (up to 14 mm) have been cooled down to 4.2 K and compressed within the range 0–5 kbar using a piston–cylinder device. The new spectroscopic data on dimers and trimers, in connection with some results previously obtained at low pressure in various matrices, lead us to confirm that the band frequencies of dimers and trimers are mainly sensitive to the intermolecular separation and do not appreciably depend on the nature of the rare gas matrix. The HCl aggregates are clearly distinguished from the microcrystals because of the quite distinct behavior observed for their corresponding translational modes. Finally, emphasis is made on the first observation of an unexpected and strong absorption band, centered at 200 cm-1, which disappears irreversibly under the effect of pressure. Its possible origin is discussed and tentatively ascribed to structure defects. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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