2007 Fiscal Year Final Research Report Summary
Observation of Ultrafast electron dynamics in the molecular frame using quantum rotational wave packet
| Project/Area Number |
17205004
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | The Institute of Physical and Chemical Research |
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Principal Investigator |
SUZUKI Toshinori The Institute of Physical and Chemical Research, Chemical Dynamics Laboratory, Chief Scientist (10192618)
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| Project Period (FY) |
2005 – 2007
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| Keywords | photoelectron spectroscopy / imaging / ultrafast snectroscopy / Nitric Oxide / photoelectron angular distribution / rotational wave nacket |
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| Research Abstract |
Time-resolved photoelectron spectroscopy is a powerful means to probe ultrafast electronic dynamics in the molecule. However, the observation is carried out in the laboratory frame, and the information is always convoluted with the broad molecular axis distribution in the laboratory frame. It is ideal to observe the electronic dynamics in the molecular frame, which requires extraction of photoionization dynamical parameters and recasting the photoelectron angular distribution in the laboratory frame into the distribution in the molecular frame. In the past, photoelectron and photoion coincidence method has been employed to extract such information, however, it is only applicable to dissociative ionization. In the present work, we created a rotational wavepacket motion of a molecule and observed photoionization from various time-dependent axis distribution, from which photoelectron angular distribution in the molecular frame has been extracted. The sample molecule was Nitric Oxide, the
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benchmark system in molecular photoionization study. We prepared a rotational wavepacket in the A state of NO by one-photon absorption from the ground state, and then ionized by another photon from the A state. The measurements were carried out on the integral and differential cross sections, and detailed theoretical analysis was performed. We found that the partial wave of outgoing photoelectron is dominated by p-wave contradicting with the prediction of f-wave by theory. It is also pointed out dic wave has appeared with a reasonable intensity whereas theory does not predict it. The existence of the cbt wave is important for describing directional ejection of an electron into either N-side or 0-side of the molecule. We are planning to collaborate further with theoreticians to elucidate the source of this discrepancy between the experiment and theory, thereby improving our understanding of molecular photoionization dynamics and develop a methodology to probe electronic dynamics in the molecular frame. Less
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Research Products
(82 results)
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[Presentation] Time resolved Photoelectron Imaging of Excited State Dynamics2007
Author(s)
Toshinori Suzuki
Organizer
Joint Symposium on Intiatives for Attractive Education in Graduate Schools of Physics and Chemistry and Application of Advanced Analytical Techniques to Chemical Substances
Place of Presentation
Hachiouji(Tokyo Metropolitan University)
Year and Date
20070200
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 原子衝突と化学反応2005
Author(s)
鈴木 俊法
Organizer
原子衝突研究協会第30回研究会
Place of Presentation
和光
Year and Date
20050800
Description
「研究成果報告書概要(和文)」より
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