| Autor: |
Steinkellner, O., Noack, F., Ritze, H.-H., Radloff, W., Hertel, I. V. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 7/22/2004, Vol. 121 Issue 4, p1765-1770, 6p, 4 Graphs |
| Abstrakt: |
Two-photon excitation with femtosecond laser pulses in the spectral range 240–250 nm was used to prepare vapor phase H2O and D2O in the C 1B1 and D 1A1 states. Both states are predissociated via the B 1A1 state, forming excited OH/OD(A 2Σ+) as well as ground state OH/OD(X 2Π). We used ultrashort infrared probe pulses (1.65–2.42 μm) to control the ratio between these excited and ground state fragments originating from the dissociation process. Time resolved detection of the OH/OD(A 2Σ+)→OH/OD(X 2Π) fluorescence allows us to monitor the dynamics of the predissociation. For the heterogeneous predissociation out of the C 1B1 state life times of (0.5±0.1) ps and (1.2±0.1) ps were found for H2O and D2O, respectively. The purely homogeneous character of the predissociation out of the D 1A1 state was monitored. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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