The studies on the formation of new chemical species and their electronic structure by stepwise two-color excitation
| Project/Area Number |
58430002
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
物理化学一般
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
TANAKA Ikuzo 東京工業大学, 理, 教授 (80016005)
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| Project Period (FY) |
1983 – 1985
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| Project Status |
Completed (Fiscal Year 1985)
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| Budget Amount *help |
¥42,000,000 (Direct Cost: ¥42,000,000)
Fiscal Year 1985: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1984: ¥7,000,000 (Direct Cost: ¥7,000,000)
Fiscal Year 1983: ¥34,000,000 (Direct Cost: ¥34,000,000)
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| Keywords | Stepwise two-color excitation / optical-optical double resonance technique / Halogen molecule / Ion-pair state / <NO_2> / 摂動解析 |
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| Research Abstract |
The purpose of this project is to identify the excited states which are normally inaccessible by the conventional spectroscopic technique. We have developed the opticaloptical double resonance (OODR) method to elucidate the electronic structure of simple molecules by the stepwise two-color excitation, as described below.
First, we have applied this technique to study the ion-pair states of halogen molecules, where the excitation of molecules proceeds through the \\B^3\\(\\O(^+_U)\\ states as an intermediate. This stepwise process compromises a large Franck-Condon shift required to probe the ion-pair states from the ground state. Furthermore, the parity selection rules associated with multiphoton transition is different from that of one-photon transition. The excited states with either g or u symmetry can be probed, depending on whether the total number of photon absorbed is even or odd, respectively. We have sorted out the ionpair states, in view of the ionic states correlating at the dissociation limits, \\X^-\\(\\^1S\\) + \\X^+\\(\\^3P\\, \\^1D, \\^1s\\) where X = Cl, Br, or i Secondly, the fluorescence of \\NO_2\\ from the 2\\^2B_2\\ state has been observed for the first time. By employing this state as a final state, the OODR spectroscopy through the visible absorption system has been applied to assign the transition responsible for the visible fluorescence of \\NO_2\\ 2\\^2B_2\\ and also to study the complex visible absorption bands. As result, the visible emission bands are vibrationally analyzed.
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Report
(1 results)
Research Products
(6 results)
