Harmonium in intense laser fields: excitation, absorption and transparency
Abstract
It is known that the dynamics of two (Coulombinteracting) nonrelativistic electrons confined by a parabolic potential and driven by a classical, intense laser field (in dipole approximation) is exactly soluble. We calculate the timedependent population of the harmonic oscillator states and the energy absorbed from the laser. It turns out that the key entity on which all observables sensitively depend is the modulus square of the Fouriertransformed vector potential of the laser field, evaluated at the harmonic oscillator frequency. The system is transparent to laser field configurations for which this entity vanishes. We discuss the Poisson statistics behaviour of the transition probabilities and analyse the conditions for the complete survival and full depletion of the initial state.
 Publication:

Journal of Physics B Atomic Molecular Physics
 Pub Date:
 February 2007
 DOI:
 10.1088/09534075/40/4/012
 arXiv:
 arXiv:physics/0610148
 Bibcode:
 2007JPhB...40..779K
 Keywords:

 Physics  Atomic Physics;
 Physics  Optics
 EPrint:
 8 pages, IOP style