报告题目：Above-threshold ionization--a history of surprises

　　报 告 人：Prof. Wilhelm Becker

　　Max-Born-Institut, Germany

　　时 间：2009年10月19日(星期一)上午10：00

　　地 点：所办公大楼六楼会议室

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　　Above-threshold ionization--the process where an atom absorbs more photons from a laser field than is necessary for ionization--has been instrumental for understanding the laser-matter interaction more than any other process. From the first observation of the effect back in 1979 to the presence, ATI has continuously produced unexpected features. This is particularly remarkable, since ATI can be observed in the simplest bound system subject to a laser field that is conceivable: the hydrogen atom. Not even the Coulomb field plays an important role for most of the ATI features. I review the phenomenoprovidelogy of ATI from the beginnings to the latest effects, some of which are still not fully understood.