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題 名 | On the First Overtone Spectra of Protonated Water Clusters [H+(H[feaf]O) ] in the Free-OH Stretch Region |
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作 者 | 吳志哲; 江志強; 李遠哲; 張煥正; | 書刊名 | Journal of the Chinese Chemical Society |
卷 期 | 49:5 2002.10[民91.10] |
頁 次 | 頁769-775 |
分類號 | 343.3 |
關鍵詞 | Overtone spectroscopy; Protonated water clusters; |
語 文 | 英文(English) |
英文摘要 | The gas-phase near-infrared spectra of protonated water clusters [H+(H2O)n, n = 3 - 5] have been obtained using a vibrational predissociation ion trap spectrometer coupled with a tunable optical parametric oscillator laser. The spectral bands in the frequency range from 7000 to 7500 cm-1 are as signed to the first overtone vibrations of non-hydrogen-bonded (free) OH stretches. Assignments of the spectra are made with reference to the data for H2O vapor, (H2O)2 in Ar matrices, and considering the presence of the excess proton in the clusters. Blue shifts of the bands are observed to increase with cluster size and are interpreted in terms of a charge screening effect. The observations have allowed determination of the anharmonicity coefficients of these cluster ions on the basis of the calculations using the term value expression of vibrational energy. |
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