TY - GEN

T1 - Generalized Floquet formulation of time-dependent density functional theory for many-electron systems in intense laser fields

AU - Telnov, DA

AU - Chu, S.-I.

PY - 2000

Y1 - 2000

N2 - We present some recent new developments of the generalized Floquet formulation of time-dependent density functional theory (TDDFT) for nonperturbative treatment of multiphoton processes of many-electron quantum systems in intense monochromatic or multi-color laser fields. It is shown that the periodically or quasi-periodically (polychromatic) time-dependent Kohn-Sham equations can be exactly transformed into an equivalent time-independent Floquet Hamiltonian matrix eigenvalue problems. A procedure is presented for the treatment of bound-bound transitions. For the bound-free transitions, such as multiphoton ionization (MPI) or multiphoton dissociation processes, we introduce the notion of "complex density" and present a non-Hermitian Floquet formalism for the treatment of complex quasienergies of individual spin-orbitals and total many-electron systems. The procedure is demonstrated by a case study of photoionization of He atoms in the photon energy range of 25 to 50 eV. Good agreement with recent experimental data is obtained. We also perform some MPI study of He and Be atoms in intense monochromatic and two-color laser fields.

AB - We present some recent new developments of the generalized Floquet formulation of time-dependent density functional theory (TDDFT) for nonperturbative treatment of multiphoton processes of many-electron quantum systems in intense monochromatic or multi-color laser fields. It is shown that the periodically or quasi-periodically (polychromatic) time-dependent Kohn-Sham equations can be exactly transformed into an equivalent time-independent Floquet Hamiltonian matrix eigenvalue problems. A procedure is presented for the treatment of bound-bound transitions. For the bound-free transitions, such as multiphoton ionization (MPI) or multiphoton dissociation processes, we introduce the notion of "complex density" and present a non-Hermitian Floquet formalism for the treatment of complex quasienergies of individual spin-orbitals and total many-electron systems. The procedure is demonstrated by a case study of photoionization of He atoms in the photon energy range of 25 to 50 eV. Good agreement with recent experimental data is obtained. We also perform some MPI study of He and Be atoms in intense monochromatic and two-color laser fields.

KW - SELF-INTERACTION CORRECTION

KW - MULTIPHOTON PROCESSES

KW - ENERGY FORMALISM

KW - GENERATION

M3 - статья в сборнике материалов конференции

SN - 1-56396-946-7

T3 - AIP Conference Proceedings

SP - 304

EP - 315

BT - MULTIPHOTON PROCESSES

A2 - DiMauro, LF

A2 - Freeman, RR

A2 - Kulander, KC

PB - American Institute of Physics

Y2 - 3 October 1999 through 8 October 1999

ER -