| Project/Area Number |
11640515
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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 University, Department of Chemical and Biological Sciences, Professor, 理学部, 教授 (40012322)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥3,000,000 (Direct Cost: ¥3,000,000)
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| Keywords | Acetylene / Vibrational Dynamics / Excited State Dynamics / Photodissociation Dynamics |
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| Research Abstract |
In order to investigate vibrational dynamics of vibronically state-selected acetylene, various spectroscopic techniques have been applied.
(1) The rovibronic level system of the ungerade nv_3'+v_4'/v_6' (n=0,1,2,3) vibrational states in the A^1A_u state of acetylene which are accessible from the selected rotational level J" of the v_3" state in the X^1Σ_g^+ state. The nv_3'+v_6' and nv_3'+v_4' state are found to couple with each other by the a-and b-axis Coriolis interactions.
(2) Most of rotational levels of the 3v_3'+v_6' state split into two or more levels, while those of the 3v_3'+v_4' state are single. The fluorescence decay from the spilit levels shows a quantum beat under a weak magnetic field. This indicates that the level splitting is attributable to the S-T interaction. Since the v_6' mode is in-plane while the v_4'is out-of-plane, the S-T interaction occurs in the planar geometry of the excited acetylene.
(3) The H-atom action spectroscopy has been applied to investigate the predissociation efficiency of acetylene excited in the gerade vibrational states in the region of 47000〜50600 cm^<-1>. The predissociation is enhanced in the states exceeding the inversion barrier of the bending vibration which is located around 48000 cm^<-1>.
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