Abstract
Multiphonon ionization of the H2 molecule under the action of a weak (probe) field, which provides the initial population of the low-lying (working) level, and intense monochromatic linearly polarized radiation is studied. The multiphoton ionization process occurs under the conditions of strong field perturbation of two intermediate Rydberg series, np0(1Σ +u and np2(1Πu), of the optical R(0)branch which have different ionization potentials. The series are occupied simultaneously as a result of single-photon absorption by an excited H *2 molecule in the working state 4s σH′1Σ +g (v=0). As a result of the irregularity in the arrangement of the intermediate levels from a large group of states that are combined in the multiphoton ionization process a sharp and irregular change occurs in the dependence of the shifts and widths Γn of the levels on the intensity f of the strong field in a transition from one level to another. It is shown that for field intensities f such that the level widths remain much less than the splitting between the levels (Γn≪/n 3) the stabilizing effect (i.e., the field-induced narrowing of the levels as f→∞) in the form Γn ∝ 1/f 2 (as happens in atoms with a structureless core) is not observed in molecular systems.
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Zh. Éksp. Teor. Fiz. 115, 1987–2000 (June 1999)
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Ivanov, G.K., Golubkov, G.B. Multiphoton ionization of molecules under the conditions of strong field-induced perturbation of Rydberg states. J. Exp. Theor. Phys. 88, 1087–1094 (1999). https://doi.org/10.1134/1.558896
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DOI: https://doi.org/10.1134/1.558896