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- W2890974552 abstract "The weak-field asymptotic theory (WFAT) of tunneling ionization in a static electric field is limited by the assumption that tunneling occurs from an isolated state in a compact atomic or molecular system. In this paper, we generalize the WFAT in two directions: to the cases when tunneling ionization occurs from (i) nearly degenerate states separated by a small energy distance $mathrm{ensuremath{Delta}}E$ in compact systems, and (ii) an isolated state in heteronuclear diatomic molecules at large internuclear distances $R$. The weak-field asymptotic formulas for the ionization rates in these two cases are obtained. The asymptotics are uniform with respect to $mathrm{ensuremath{Delta}}E$ and $R$ and for sufficiently large $mathrm{ensuremath{Delta}}E$ and small $R$, respectively, reduce to the previously known WFAT rate formula. By combining the two asymptotics, we obtain a formula for the ionization rates from the nearly degenerate $1s{ensuremath{sigma}}_{g}$ and $2p{ensuremath{sigma}}_{u}$ states of a homonuclear molecular ion ${{mathrm{H}}_{2}}^{+}$ at large internuclear distances, which is of particular interest for applications in strong-field physics. The analytical results are illustrated by calculations for several atomic and molecular models." @default.
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- W2890974552 date "2018-09-04" @default.
- W2890974552 modified "2023-10-14" @default.
- W2890974552 title "Weak-field asymptotic theory of tunneling ionization from nearly degenerate states" @default.
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- W2890974552 doi "https://doi.org/10.1103/physreva.98.033401" @default.
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