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

Abstract

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.

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

“…Among the SSs, we consider only tunneling states which turn into bound states for F = 0. It should be mentioned that there exists another type of SSs, static-field-induced states [40,41], which do not have counterparts in the absence of the field. The complex SS eigenvalue presented in the form…”

“…The continuum states are not given by any single one of these functions, but can be expanded in terms of them. We note that the static-field-induced states mentioned above [40,41], which do not have counterparts for F = 0, are also included in the set of (N−1) nM S (Q N−1 ), but for them Eq. (35b) implies certain regularization.…”

On the possibility of enhanced multiple ionization near conical intersections

“…24 In polyatomic molecules this phenomenon has been generalized as a resonant tunnel ionization mechanism that proceeds through a light-induced structure formed out of a combination of the molecular potential and the external quasi-static eld. [25][26][27] 3B Enhanced ionization via strong eld distortion-induced resonances…”