科研之友
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摘要
The adiabatic theory of ionization of an electron, initially bound in a three-dimensional potential well, by an intense low-frequency laser pulse is developed. The general case of arbitrary time dependence and polarization of the laser field and arbitrary potential which can model an atom or a molecule in the single-active-electron approximation is treated, with the only restriction that the potential should not have a Coulomb tail. The asymptotics of the solution to the time-dependent Schrodinger equation and photoelectron momentum distribution in the adiabatic regime are obtained. Both the adiabatic and the rescattering parts of the wave function and ionization amplitude are considered. These asymptotics are expressed in terms of the Siegert state originating from the initial bound state in the presence of a static electric field and scattering states in the unperturbed potential. They are uniform in terms of the amplitude of the laser field and apply to weak underbarrier as well as strong overbarrier fields, provided the condition defining the region of validity of the adiabatic approximation is fulfilled. The theory is illustrated by calculations which confirm that the adiabatic results converge to the exact ones as the adiabatic parameter tends to zero.
- 出版日期2012-10-11
