| Autor: |
Okumura, M., Yeh, L. I., Normand, D., van den Biesen, J. J. H., Bustamente, S. W., Lee, Y. T., Lee, Timothy J., Handy, Nicholas C., Schaefer, Henry F. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 4/1/1987, Vol. 86 Issue 7, p3807, 9p |
| Abstrakt: |
Recently the presence and radiative decay of vibrationally excited CH-2, generated in a hot cathode discharge of methane, was established by measuring the time dependent photodetachment from excited states of CH-2 as it radiatively relaxed in a high vacuum ion trap. The time dependence of the photodetachment was found to be consistent with an electron affinity of 5250 cm-1 (0.65 eV) for ground state X 3B1 methylene. The radiative decay lifetimes of the first three excited bending vibrations of CH-2 were also tentatively assigned. Here, we report a more refined analysis of the experimental data along with theoretical ab initio determinations of the radiative decay lifetimes of the first four excited bending vibrational levels of CH-2. There is some discrepancy between the ab initio values (431, 207, 118, and 68 ms for the v2=1, 2, 3, and 4 levels respectively) and the experimental values (525, 70, and 14 ms for v2=1, 2, and 3 respectively) for v2=2 and 3. Possible reasons for this discrepancy are discussed but none of the alternatives are entirely satisfactory. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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