1998 Fiscal Year Final Research Report Summary
Photoexcitation Dynamics of Vibrationally Excited Molecules
| Project/Area Number |
09640613
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | JAPAN WOMEN'S UNIVERSITY |
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Principal Investigator |
TSUCHIYA Soji Japan Women's Univ., Fac.of Sci., Professor, 理学部, 教授 (40012322)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Vibrational Dynamics / Excited State / 光解離反応 |
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| Research Abstract |
Excited state dynamics of rovibronically selected acetylene has been investigated by means of the laser-induced fluorescence(LIF) and the dispersed fluorescence(DF) spectroscopies.
When acetylene in the electronic ground state(X^^-) is phtoexcited to levels in the electronic excited state(A^^-), most intense spectral transitions form a progression of trans-GH bending mode V^n(n=4-6). In the vicinity of the V^6 level in the A state, two near-lying levels were found to exist 4.5cm^<-1> apart. The DF spectra from these two levels were found to show signiicantly different spectral patterns : One DF spectrum is characterized by the trans-CH bending and CC stretching progressions, while the other one the cis-CH bending. This fact was interpreted as that the zero-order V^6 level interacts with a dark level including the cis-CH bending mode through anharmonic resonance, and thus, it is concluded that these two levels are located above the trans-cis isomerization barrier.
The IR-UV double resonance spectroscopy was applied to observe the ungerade vibronic levels of acetylene in the A state to which one photon transition is forbidden from the vibronic ground level. The observed rotational line structure indicates a strong coupling between the cis in-plane CH bending(v^<S'>_6) and the out-of-plane CH bending(v^'_4) modes, though some unassignable lines remain to be discussed in terms of another type of interactions.
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Research Products
(8 results)
