Theory of Multiphoton Ionization of Atoms

摘要: Laser pulses having intensities of the order or exceeding atomic unit intensity I a = 3.5 × 1016 W cm−2, corresponding to electric field strength e 5.1 109 V cm−1, can be readily produced in laboratories today. Such fields are strong enough compete with Coulomb forces controlling electron dynamics systems. As result, atoms intense laser exhibit variety phenomena, which collectively referred as multiphoton processes. In this contribution we shall review theory one important process: ionization atoms. We begin by giving brief overview some basic features ionization. Experimental results will used illustrate these features. Next, discuss general issues concerning study interaction fields. particular, introduce form time-dependent Schrodinger equation solved and outline perturbation for laser-atom interactions. Two non-perturbative approaches solving equation, namely use Floquet direct numerical integration then considered. Subsequently, approximation schemes low high frequency regimes. Finally, make remarks relativistic effects The reader is book edited Gavrila [1], articles Burnett et al. [2], Joachain [3], DiMauro Agostini [4], Protopapas [5] [6] well other contributions volume more detailed discussions