Resonance ionisation of Ga atoms

Mikhail Vladimirovich Fedorov

Direct and resonant ionisation of atoms are considered for the case of an intense electromagnetic wave with any smooth envelope. The JWKB method (over time) is used along with other approaches to solve this problem. Various ranges of light pulse and atomic parameters lead to physically different regimes of resonant ionisation. The resonance curves describing the dependence of the ionisation probability w on the detuning parameter epsilon are obtained. A general expression for the resonance width Gamma is given which is valid for light pulses of arbitrary intensity, duration and shape.

Alexey E. Kazakov, Vyacheslav P. Makarov, Mikhail Vladimirovich Fedorov

P. Thornton Greenland

A simple expression for the ion yield from resonant three-photon ionisation through an autoionising level of a complex atom is obtained. In contrast to some treatments it is assumed that coherent, pulsed lasers of fixed polarisation are used to ionise the atoms, and effects which arise from the coherence are identified. The dependence of ion yield on the laser polarisations is exposed, and the possibility of a spectroscopy based on this dependence is discussed. As an example, it is shown how the spin of the autoionising level in a complex atom may be determined by only relative ionisation measurements.

Nikolai B. Delone, В. П. Крайнов

Nikolai B. Delone, В. П. Крайнов

Paola Bicchi, S. Barsanti