0509135v2

related topics
{equation, function, exp}
{level, atom, field}
{cos, sin, state}
{energy, state, states}
{let, theorem, proof}
{wave, scattering, interference}
{light, field, probe}

Exact Solution for a Two-Level Atom in Radiation Fields and the Freeman Resonances

Dong-Sheng Guo, Yong-Shi Wu, Linn Van Woerkom

abstract: Using techniques of complex analysis in an algebraic approach, we solve the wave equation for a two-level atom interacting with a monochromatic light field exactly. A closed-form expression for the quasi-energies is obtained, which shows that the Bloch-Siegert shift is always finite, regardless of whether the original or the shifted level spacing is an integral multiple of the driving frequency, $\omega$. We also find that the wave functions, though finite when the original level spacing is an integral multiple of $\omega$, become divergent when the intensity-dependent shifted energy spacing is an integral multiple of the photon energy. This result provides, for the first time in the literature, an ab-initio theoretical explanation for the occurrence of the Freeman resonances observed in above-threshold ionization experiments.

oai_identifier:
oai:arXiv.org:quant-ph/0509135
categories:
quant-ph physics.atom-ph physics.optics
comments:
24 pages, no figure; v2 typos corrected
arxiv_id:
quant-ph/0509135
created:
2005-09-20
updated:
2005-09-22

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