| DATE: |
2006-12-18 14:00 - 15:00 |
| PLACE: |
Rinkoshitsu 1, 2F, Building #4 |
| TITLE: |
PF Seminar Time resolved X-ray diffraction on solutions of small organic molecules |
| SPEAKER: |
Dr. Qingyu Kong (ESRF) |
| LANGUAGE: |
English |
| URL: |
http://pfwww.kek.jp/pf-seminar/ |
| ABSTRACT: |
Accurate determination of molecular structures has been one of the most
challenging and enduring subject in chemistry, especially the intermediates
with very short lifetime. Hard x-ray photons produced from synchrotron with
a wavelength of less than one angstrom can interact with not only the outer
shell but also the core electrons that directly indicate molecular geometry,
the x-ray diffraction is thus a powerful method to determine molecular
structures in both crystal and liquid phases. Time-resolved x-ray
diffraction that combines the spatial and temporal measurements can resolve
the molecular geometries of short-lived intermediates and free radicals in a
chemical reaction. In the talk, the optical pump and x-ray probe setup in
ID09 ESRF is introduced firstly, then the photodissociation reaction of
tetrabromomethane (CBr4) dissolved in methanol is used as an example to show
how the intermediate molecular structures are determined and the chemical
reaction processes are followed by this technique. |
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