PHYSICS/BK21 Colloquium[09.09.11]
관련링크
본문
" “ Femtosecond Soft X-ray Absorption
Spectroscopy of Solvated Molecules”
♦Speaker : Prof. Tae Kyu Kim [Pusan National University]
♦Place : Physics Seminar Room (Science Bldg, 3-201)
♦Date & Time : Sep, 11(Fri) 4:00 ~ 5:00 pm
Abstract
Time-resolved laser spectroscopy and established x-ray methods have recently been
combined to probe the local electronic and molecular structure with femtosecond
x-ray pulses in time and energy. In the soft x-ray range, core-level transition are
particularly sensitive to valence-charge distributions and to chemical coordination of
and structure around lighter elements (C, N, O etc.) that are biologically relevant,
holding tremendous potential for following chemical bonding and the formation of new
molecular species in real time. This is particularly powerful for understanding molecular
dynamics in solution, where important chemistry occurs. We study the ultrafast spin
cross-over reaction in a solvated iron(II) complex by femtosecond soft x-ray
spectroscopy of the iron L-edges. Our recent results in combination with charge
transfer multiplet calculations reveal a wealth of information on the changes of the
electronic valence charge distributions, including changes in ligand-field splitting,
orbital delocalization and population, and the influence of ligand π-backbonding on
ultrafast timescales.
Contact Person : Prof. Dong-Eon Kim (054-279-2089, kimd@postech.ac.kr)
"
Spectroscopy of Solvated Molecules”
♦Speaker : Prof. Tae Kyu Kim [Pusan National University]
♦Place : Physics Seminar Room (Science Bldg, 3-201)
♦Date & Time : Sep, 11(Fri) 4:00 ~ 5:00 pm
Abstract
Time-resolved laser spectroscopy and established x-ray methods have recently been
combined to probe the local electronic and molecular structure with femtosecond
x-ray pulses in time and energy. In the soft x-ray range, core-level transition are
particularly sensitive to valence-charge distributions and to chemical coordination of
and structure around lighter elements (C, N, O etc.) that are biologically relevant,
holding tremendous potential for following chemical bonding and the formation of new
molecular species in real time. This is particularly powerful for understanding molecular
dynamics in solution, where important chemistry occurs. We study the ultrafast spin
cross-over reaction in a solvated iron(II) complex by femtosecond soft x-ray
spectroscopy of the iron L-edges. Our recent results in combination with charge
transfer multiplet calculations reveal a wealth of information on the changes of the
electronic valence charge distributions, including changes in ligand-field splitting,
orbital delocalization and population, and the influence of ligand π-backbonding on
ultrafast timescales.
Contact Person : Prof. Dong-Eon Kim (054-279-2089, kimd@postech.ac.kr)
"
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