Enhanced ionization of the two-electron molecule H2 in intense laser fields : Mechanism of the creation of doorway states
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Bibliographic record
Abstract
We investigate the mechanism of enhanced ionization in the two electron molecule H 2 subjected to an ultrashort, intense laser pulse by solving exactly the time-dependent Schrodinger equation for a one-dimensional model. Results of the simulation are analyzed by using the field following three adiabatic states that are adiabatically connected with the lowest three essential electronic states of H 2 as a field changes. Ionization is enhanced when the excited ionic state H - H + is most efficiently created from the covalent ground state HH in the level dynamics prior to ionization. An analytic expression for the ionic and covalent crossing condition is also obtained in terms of the three essential states and agrees well with the numerical results. As the internuclear distance R decreases, the population of the H - H + created increases whereas the ionization rate from a pure H - H + state decreases owing to the stronger attraction by the distant nucleus. As a result, the ionization is most enhanced at intermediate internuclear R (6) range where covalent and ionic configurations cross.
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| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
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| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
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| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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