Multiphoton ionization of molecules under the conditions of strong field-induced perturbation of Rydberg states |
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Authors: | G K Ivanov G B Golubkov |
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Institution: | (1) N. N. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 117977 Moscow, Russia |
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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.
Zh. éksp. Teor. Fiz. 115, 1987–2000 (June 1999) |
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Keywords: | |
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