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• W2004372005 abstract "We investigate the mechanism of enhanced ionization that occurs at a critical internuclear distance ${R}_{c}$ in the two-electron symmetric linear triatomic molecule ${mathrm{H}}_{3}^{+}$ subjected to an ultrashort, intense laser pulse by solving exactly the time-dependent Schrodinger equation for a one-dimensional model of ${mathrm{H}}_{3}^{+}.$ Results of the simulations are analyzed by using three essential adiabatic field states |1〉, |2〉, and |3〉 that are adiabatically connected with the lowest three electronic states ${X}^{1}{ensuremath{Sigma}}_{g}^{+},$ ${B}^{1}{ensuremath{Sigma}}_{u}^{+},$ and ${E}^{1}{ensuremath{Sigma}}_{g}^{+}$ of the field free ion. We give also a simple MO (molecular orbital) picture in terms of these three states to illustrate the important electronic configurations in an intense field. The states |1〉, |2〉, and |3〉 are shown to be composed mainly of the configurations ${mathrm{HHH}}^{+},$ ${mathrm{HH}}^{+}mathrm{H},$ and ${mathrm{H}}^{+}mathrm{HH},$ respectively in the presence of the field. We conclude that the overall level dynamics is governed mainly by transitions at the zero-field energy quasicrossings of these three states. The response of ${mathrm{H}}_{3}^{+}$ to a laser field can be classified into two regimes. In the adiabatic regime $(R<{R}_{c}),$ the electron transfers from one end of the molecule to the other end every half optical cycle thus creating the ionic component ${mathrm{H}}^{+}{mathrm{H}}^{+}{mathrm{H}}^{mathrm{ensuremath{-}}}.$ In the diabatic regime $(R>{R}_{c}),$ internuclear electron transfer is suppressed due to electron repulsion and laser induced localization. In the intermediate $(Rensuremath{simeq}{R}_{c})$ region, where enhanced ionization occurs, the state |3〉 is most efficiently created by the field-induced nonadiabatic transitions between the states at quasicrossing points. The ``quasistatic'' laser-induced potential barriers are low enough for the electron to tunnel from the ascending (upper) well, thus confirming the quasistatic model at high intensities. Analytic expressions for the critical distance ${R}_{c}$ are obtained from this model and collective electron motion is inferred from the detailed time-dependent two-electron distributions." @default.
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• W2004372005 date "2001-09-18" @default.
• W2004372005 modified "2023-10-16" @default.
• W2004372005 title "Mechanism of enhanced ionization of linear<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant=normal>H</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math>in intense laser fields" @default.
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• W2004372005 doi "https://doi.org/10.1103/physreva.64.043411" @default.
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