アセトアニリド ケッショウ ニ オケル シンドウ スペクトル ノ コウアツ ラマン ケンキュウ
| Autor: | Sakai, Masamichi, Kuroda, Noritaka, Nishina, Yuichiro |
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| Jazyk: | angličtina |
| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Physical Review B. 47(1):150-157 |
| ISSN: | 0163-1829 |
| Popis: | We have studied the effect of pressure on the low-frequency lattice modes and the amide-I (N-C?O stretching) vibrational modes in crystalline acetanilide (C6H5NHCOCH3) in the temperature range 80–300 K by means of Raman spectroscopy. The Raman intensity of the 1650-cm-1 band, which appears upon cooling, is enhanced by applying pressure. The energy difference between the amide-I phonon (Ag mode) and the 1650-cm-1 bands does not change appreciably under pressure up to at least 4 GPa. These results are analyzed in terms of the self-trapped model in which a single lattice mode couples with the amide-I excitation by taking into account the effect of pressure on the low-frequency lattice modes and on the dipole-dipole interactions associated with the amide-I vibration. A band is observed at 30 cm-1 below the amide-I phonon band at low temperatures with a pressure above ∼2 GPa. 有機分子性結晶特有の分子振動と格子振動の結合形態をアセトアニリド結晶についてラマン散乱により実験的に調査した。実験は大気圧下と、ダイヤモンドアンビルセルを用いた加圧下で、室温から80 Kまでの範囲で精密に温度を変えて行った。その結果、アミド-I分子振動モードが格子振動と結合して自己束縛を起こした振舞いを明瞭に観測することができ、分子・格子結合のメカニズムを解明するとともに、結合定数を定量的に評価することができた。 |
| Databáze: | OpenAIRE |
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