STRFLO: A program for time-independent calculations of multiphoton processes in one-electron atomic systems I. Quasienergy spectra and angular distributions

Abstract The program presented calculates quasienergy spectra of one-electron atoms or ions undergoing multiphoton ionization in an intense two-colour field or ionization in a strong static electric field. The electron is initially bound by a single Coulomb potential or by a superposition of a short-range potential and a Coulomb potential. Besides quasienergies, the program can obtain rates of photoionization in specific ATI channels and angular distributions of photoelectrons, in the approximation where the atom is represented by a single dressed state. The calculation can be perturbative or nonperturbative. The Floquet equations are solved on a basis of spherical harmonies and complex Sturmian functions.

[1]  Ed Anderson,et al.  LAPACK Users' Guide , 1995 .

[2]  C. Joachain,et al.  Quantum Collision Theory , 1984 .

[3]  W. Reinhardt,et al.  Stark ionization in dc and ac fields: An L2 complex-coordinate approach , 1983 .

[4]  J. J. Wendoloski,et al.  Complex coordinates and the Stark effect , 1978 .

[5]  Emil Wolf,et al.  Principles of Optics: Contents , 1999 .

[6]  C. Joachain,et al.  Photon and Electron Collisions with Atoms and Molecules , 1997 .

[7]  William P. Reinhardt,et al.  Complex Coordinates in the Theory of Atomic and Molecular Structure and Dynamics , 1982 .

[8]  K. Yajima.  Resonances for the AC-Stark effect , 1982 .

[9]  C. Joachain,et al.  R-Matrix-Floquet Theory of Multiphoton Processes , 1990 .

[10]  Shakeshaft,et al.  Light-induced states of H and H-, shadow states, and the dressed potential. , 1995, Physical review. A, Atomic, molecular, and optical physics.

[11]  Shih-I Chu,et al.  Intense Field Multiphoton Ionization via Complex Dressed States: Application to the H Atom , 1977 .

[12]  S. Chu,et al.  Semiclassical many-mode floquet theory , 1983 .

[13]  Shakeshaft.  Sturmian expansion of Green's function and its application to multiphoton ionization of hydrogen. , 1986, Physical review. A, General physics.

[14]  Chu,et al.  Threshold shift and above-threshold multiphoton ionization of atomic hydrogen in intense laser fields. , 1985, Physical review. A, General physics.

[15]  Dörr,et al.  Atomic hydrogen in a strong optical radiation field. , 1994, Physical review. A, Atomic, molecular, and optical physics.

[16]  E. Luc-Koenig,et al.  Systematic theoretical study of the Stark spectrum of atomic hydrogen. I. Density of continuum states , 1980 .

[17]  Bernard Piraux,et al.  Super-Intense Laser-Atom Physics , 1993 .

[18]  Shakeshaft,et al.  Nonperturbative calculation of partial differential rates for multiphoton ionization of a hydrogen atom in a strong laser field. , 1988, Physical review. A, General physics.

[19]  The calculation of multiphoton ionization rates of the hydrogen molecular ion , 1998 .

[20]  C. Joachain,et al.  R-matrix-Floquet theory of multiphoton processes. II. Solution of the asymptotic equations in the velocity gauge , 1992 .

[21]  Jack J. Dongarra,et al.  An extended set of FORTRAN basic linear algebra subprograms , 1988, TOMS.

[22]  Shakeshaft,et al.  Movement and interplay of the bound state, resonance, and shadow poles of the scattering amplitude in multiphoton processes. , 1988, Physical review. A, General physics.

[23]  R. Potvliege,et al.  Adiabatic stabilization of a circular state: Theory compared to experiment , 1998, physics/9805036.

[24]  Jack J. Dongarra,et al.  A set of level 3 basic linear algebra subprograms , 1990, TOMS.