The ultrafast relaxation dynamics of the inner-shell excitation in a CsCl crystal were investigated, for the first time to our knowledge, by use of the high harmonics of a femtosecond Ti:sapphire laser. The luminescence due to the recombination between the valence electron and the inner-shell hole evolved with a time constant of 220±50 fs, corresponding to the lattice-displacement time for the self-trapping of the inner-shell hole. This is the first observation of the lattice relaxation induced by the inner-shell excitation on the femtosecond time scale. The dynamics of the inner-shell hole are discussed by use of a configuration-coordinate model for the inner-shell hole.
© 2002 Optical Society of America
(190.4160) Nonlinear optics : Multiharmonic generation
(300.6560) Spectroscopy : Spectroscopy, x-ray
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
Taro Sekikawa, Tomohiro Yamazaki, Yasuo Nabekawa, and Shuntaro Watanabe, "Femtosecond lattice relaxation induced by inner-shell excitation," J. Opt. Soc. Am. B 19, 1941-1945 (2002)