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Frequency dependence of tunnel ionization of deep impurities in terahertz field

Ganichev, Sergey ; Ziemann, E. ; Gleim, T. ; Yassievich, Irina ; Prettl, Wilhelm


The nonlinear process of ionization of deep impurities in high-frequency electromagnetic fields show different types of frequency dependencies in two limit cases: tunnel ionization at low frequencies and multiphoton ionization at high frequencies. In terahertz range, depending upon temperature, and radiation frequency and intensity, both processes may take place. Here we report on investigations ...


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