| 概 要 |
近く、Vlasta Bonacic-Koutecky教授（Humboldt大学、ドイツ）とBertrand Girard教授（Paul Sabatier大学、フランス）が来所されます。
Bonacic-Koutecky教授は金属クラスターの光物性やレーザーによる反応制御に関する理論的な研究で著名な研究者です。
Girard教授はコヒーレント制御の分野で世界をリードするお一人です。
この機会に以下の要領でご講演をお願いしましたので、ぜひ皆さんにご参加いただき、活発な討論を行っていただければ幸いに存じます。
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講演者 |
Vlasta Bonacic-Koutecky (Humboldt University, Germany) |
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演 題 |
What can noble metal clusters do? From reactivity to emiss |
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講演要旨 |
Reactivity of silver and gold clusters towards O2 and CO will be addressed in context of catalytic processes. Several open questions to be answered are: i) Is it sufficient to have an atomic oxygen for the oxidation to proceed? ii) Why is gold more special than silver?
Therefore, the role of structure-reactivity relationship as well as dynamical properties such as the nature of internal vibrational redistribution (IVR) as reactivity promotion criterion will be presented.
Silver clusters play an important role in a search for efficient fluorescent materials in context of advanced optical data storage media or biosensoring materials. Therefore, we investigated absorption and emission properties of silver clusters in different environments: at support or interacting with biomolecules size. Structure dependent absorption and emission of silver clusters at MgO support obtained from TDDFT will be presented, with the aim to select most effective size of the clusters and the site of the support.
Furthermore, we show that optical absorption patterns of cationic silver cluster-tryptophan hybrid systems are size and structure selective. The influence of charge solvated versus zwitterionic structures on interactions of excitations between subunits plays a key role.
Our joint theoretical and experimental findings provide insight into the mechanism responsible for enhancement of absorption or emission in nanoparticle-biomolecular hybrid systems. |
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講演者 |
Bertrand Girard (Universite Paul Sabatier, France) |
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演 題 |
Quantum state measurements with coherent transients |
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講演要旨 |
In a two level atom, real-time quantum state holography is performed through interferences between quantum states created by a reference pulse and a chirped pulse resulting in coherent transients. A sequence of several measurements allows one to measure the real and imaginary parts of the excited state wave function. These measurements are performed during the interaction with the ultrashort laser pulse. The extreme sensitivity of this method to the pulse shape provides a tool for electric field measurement. |
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