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To measure and control the electron motion in atoms and molecules by the strong laser field on the attosecond time scale is one of the research frontiers of atomic and molecular photophysics. It involves many new phenomena and processes and raises a series of questions of concepts, theories, and methods. Recent studies show that the Coulomb potential can cause the ionization time lag (about 100 attoseconds) between instants of the field maximum and the ionization-rate maximum. This lag can be understood as the response time of the electronic wave function to the strong-field-induced ionization event. It has a profound influence on the subsequent ultrafast dynamics of the ionized electron and can significantly change the time—frequency properties of electron trajectory (an important theoretical tool for attosecond measurement). Here, the research progress of response time and its implications on attosecond measurement are briefly introduced. 相似文献
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<正>氢原子中基态电子的经典轨道周期约为150阿秒。通常为了方便描述该量级的时间,人们用原子单位,一个原子单位时间约为24阿秒,这个时间尺度也被看作电子运动的自然时间尺度,要对如此快的运动过程进行直接测量的时钟则需要阿秒量级的分辨本领。为了探测超快过程,人们早在20世纪30年代就发明了频闪摄影术[1],当频闪观测器的频率与被测对象的频率同步时,就能把被测对象的画面钉住而静态观察,这样就实现了对人眼来不及反应的快速过程进行清楚地观察。 相似文献
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