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Seminars & Lectures

* TITLE

Theoretical models to understand ultrafast dynamic studies with x-rays

* SPEAKERS

Name	Affiliation	E-mail
Hae Ja Lee	Univ.of California, Berkelay	kimd(at)postech.ac.kr

* HOST(Applicant)

Name	Affiliation	E-mail
-

* DATE / TIME

2007-01-22, 10:00 - 11:00 a.m.

* PLACE

APCTP Headquarters seminar room, Pohang

* ABSTRACT

We have studied the ultrafast dynamics of pumped materials using x-ray diffraction and scattering. With low pump power, the results show a shift and broadening of the diffraction curve due to the stimulated lattice expansion. To understand the response of the lattice, the measured time- and angle-resolved diffraction curves will be compared with a theoretical calculation based on dynamic diffraction theory. In addition, the emerging interest and effort in understanding the properties of matter under extreme condition with high pump power will be described. With the propagation of intense laser pulse, heat flow from the surface generates the hot dense medium. To understand of the mechanism in the creation of the hot dense medium and the interaction of atoms/ions, Thomson scattering measurement will be introduced. Since Thomson scattering cross section diagnostic is directly related to the dynamic structure factor, theoretical approach in terms of the dynamic structure factor will be introduced.

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