16 research outputs found
Theory and computation of electromagnetic transition matrix elements in the continuous spectrum of atoms
The present study examines the mathematical properties of the free-free (
f-f) matrix elements of the full electric field operator, of the multipolar
Hamiltonian. Special methods are developed and applied for their computation,
for the general case where the scattering wavefunctions are calculated
numerically in the potential of the term-dependent (N-1) electron core, and are
energy-normalized. It is found that, on the energy axis, the f-f matrix
elements of the full operator have singularities of first order in the case of
equal photoelectron energies. The numerical applications are for f-f
transitions in Hydrogen and Neon, obeying electric dipole and quadrupole
selection rules. In the limit of zero photon wave-number, the full operator
reduces to the length form of the electric dipole approximation (EDA). It is
found that the results for the EDA agree with those of the full operator, with
the exception of a photon wave-number region about the singularity.Comment: 39 pages, 11 figure
On the violation of the exponential decay law in atomic physics: Ab initio calculation of the time-dependence of the He- 1s2p(2) P-4 non-stationary state
Journal URL: http://www.iop.org/EJ/journal/0953-407
Controllable surfaces of path interference in the multiphoton ionization of atoms by a weak trichromatic field
Journal URL: http://www.iop.org/EJ/journal/JOpt
Partial Widths and Interchannel Coupling in Auto-Ionizing States in Terms of Complex Eigenvalues and Complex Coordinates
Journal URL: http://pra.aps.org
Variation of harmonic generation from He interacting with short laser pulses of 5 eV as a function of pulse rise time and intensity
Journal URL: http://pra.aps.org
Interference generalized cross-section for the multiphoton detachment of H- in dichromatic fields
Journal URL: http://www.iop.org/EJ/journal/0953-407
Attosecond dynamics of electron correlation in doubly excited atomic states
Journal URL: http://www.iop.org/EJ/journal/0953-407
Electric dipole versus full interaction in the dynamics of laser excitation of Rydberg wavepackets
Journal URL: http://www.iop.org/EJ/journal/0953-407
Theory and computation of electron correlation in the continuous spectrum: Double photoionization cross section of H- and He near and far from threshold
Journal URL: http://pra.aps.org