Decay of a negative molecular ion in a constant electric field

Borzunov, Sergei; Manakov, N. L.; Starace, Anthony F.; Frolov, M. V.

doi:10.1134/s1063776111030095

Cited by 9 publications

(12 citation statements)

References 31 publications

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“…This completes a survey of the results available in the theory for one-electron systems. In addition, we mention studies of the one-center [13] and two-center [14,15] zero-range-potential models for which the problem of finding the ionization rate reduces to solving a transcendental equation and the asymptotic expansion (1) follows straightforwardly from this equation.…”

Section: Introductionmentioning

confidence: 99%

Weak-field asymptotic theory of tunneling ionization in many-electron atomic and molecular systems

2014

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The weak-field asymptotic theory of tunneling ionization in an external static uniform electric field [Tolstikhin et al., Phys. Rev. A 84, 053423 (2011)] is extended to many-electron atomic and molecular systems treated in the frozen-nuclei approximation. The leading-order term in the asymptotic expansion of the ionization rate in the value of the field F for F → 0 is obtained. The resulting formulas express in terms of properties of the unperturbed system. The most essential difference from the one-electron case, through which the many-electron character of the present theory reveals itself, is that the structure factor for a given ionization channel, defining the dependence of the ionization rate into this channel on the orientation of the system with respect to the field, is determined by the corresponding Dyson orbital. The theory is illustrated by calculations for several few-electron systems. The asymptotic results are compared with accurate fully correlated calculations of tunneling ionization rates available in the literature.

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Section: Introductionmentioning

confidence: 99%

Weak-field asymptotic theory of tunneling ionization in many-electron atomic and molecular systems

2014

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“…We can analyze the interaction between TS 2 and the nth SFIS near their crossing by retaining the rhs of Eq. (32). Let the real F c and E c = F c R n (F c ) + E 2 (F c ) = ε n (F c ) be the coordinates of the crossing point in a cut similar to the ones shown Fig.…”

Section: E Ts 2 As a Function Of F And R: Peaks Of The Ionization Ramentioning

confidence: 99%

“…This approximation is rather good for low-lying BPs, but becomes worse as the index n grows. This is explained by the fact that the quantization condition (32) holds only for small values of the tunneling exponent e −2σ (E) , while the potential barrier becomes narrower and the exponent approaches unity as n grows. It can be shown that near the point (F n ,R n ) the function E 2 (F,R) satisfies Eq.…”

Section: E Ts 2 As a Function Of F And R: Peaks Of The Ionization Ramentioning

confidence: 99%

“…[26], as suggested in Ref. [32] on the basis of a more detailed analytical and numerical analysis of the two-center short-range potential model [31].…”

Section: Introductionmentioning

confidence: 99%

“…[31,32] proceeds via a bound state on the other center. In this paper we consider RTI proceeding via another type of intermediate states.…”

Section: Introductionmentioning

confidence: 99%

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Static-field-induced states and their manifestation in tunneling ionization dynamics of molecules

et al. 2012

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The physical origin and properties of quasistationary static-field-induced states (SFISs) are discussed. SFISs can be supported by a combination of any atomic or molecular potential and an external static electric field and do not have counterparts in the absence of the field. A resonant tunneling ionization (RTI) mechanism of molecules proceeding via SFISs is analyzed for a one-dimensional model. It is shown that SFISs manifest themselves as peaks of the tunneling ionization rate both in static and time-dependent fields in the adiabatic regime. The peaks are located along the RTI ridges in the plane of internuclear distance R and the momentary value of electric field F . The RTI via SFISs appears to be one of the general ionization mechanisms of molecules.

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Anti-Stokes-enhanced tunnelling ionization of polar molecules

Kornev¹,

Zon²

2014

Laser Phys.

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We generalize the correct account for molecule vibrational motion in tunnelling ionization, proposed earlier (Kornev and Zon 2012 Phys. Rev. A 86 043401), to the case of polar molecules. We consider the tunnel effect in both dc and ac fields, taking into account perturbation of vibrational motion by an external field. We develop a method for accounting for dipole moment on the base of the electronic wave function expansion over dipole-spherical functions instead of ordinary spherical functions. The change of polar molecule ionization probability compared to non-polar molecule ionization is mainly due to constant change in the asymptotic form of the valence electron wave function, both in the dc and ac fields. We present numerical results for HF and HCl molecules of various isotopic proportions for specific orientations of the molecule axis relative to the electric field strength. The maximum rate of the tunnel effect for these molecules is achieved if the internuclear axis is oriented perpendicularly to the electric field.

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Decay of a negative molecular ion in a constant electric field

Cited by 9 publications

References 31 publications

Weak-field asymptotic theory of tunneling ionization in many-electron atomic and molecular systems

Weak-field asymptotic theory of tunneling ionization in many-electron atomic and molecular systems

Static-field-induced states and their manifestation in tunneling ionization dynamics of molecules

Anti-Stokes-enhanced tunnelling ionization of polar molecules

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