Partial Fourier-transform approach to tunnel ionization: Atomic systems

Murray, Ryan; Liu, Wing‐Ki; Ivanov, Misha

doi:10.1103/physreva.81.023413

Cited by 42 publications

(56 citation statements)

References 30 publications

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“…Recently, it was suggested that the transverse width is somewhat underestimated by Eqn. 6 [33][34][35]. We have taken this correction into account by using [33].…”

Section: B Theorymentioning

confidence: 99%

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Formation of very-low-energy states crossing the ionization threshold of argon atoms in strong mid-infrared fields

et al. 2014

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Atomic ionization by intense mid-infrared (mid-IR) pulses produces low electron energy features that the strong-field approximation, which is expected to be valid in the tunneling ionization regime characterized by small Keldysh parameters (γ 1), cannot describe. These features include the low-energy structure (LES), the very-low-energy structure (VLES), and the more recently found zero-energy structure (ZES). They result from the interplay between the laser electric field and the atomic Coulomb field which controls the low-energy spectrum also for small γ. In the present joint experimental and theoretical study we investigate the vectorial momentum spectrum at very low energies. Using a reaction microscope optimized for the detection of very low energy electrons,we have performed a thorough study of the three-dimensional momentum spectrum well below 1 eV. Our measurements are complemented by quantum and classical simulations, which allow for an interpretation of the LES, VLES and of the newly identified ZES in terms of two-dimensionalCoulomb focusing and recapture into Rydberg states, respectively.

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“…Recently, it was suggested that the transverse width is somewhat underestimated by Eqn. 6 [33][34][35]. We have taken this correction into account by using [33].…”

Section: B Theorymentioning

confidence: 99%

“…6 [33][34][35]. We have taken this correction into account by using [33]. For each set of initial conditions taken from properly normalized distribution functions, the trajectory is calculated in the combined fields of the remaining laser pulse and the ionic core.…”

Section: B Theorymentioning

confidence: 99%

Formation of very-low-energy states crossing the ionization threshold of argon atoms in strong mid-infrared fields

et al. 2014

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“…Following [10], the boundary is placed in the asymptotic region E 0 a/I p 1 κa of the ground-state wave function, where κ = 2I p , and E 0 is the amplitude of the laser field. In this region the error in approximating the polarized wave function with the field-free initial wave function is of the order of ∼ E 0 a 2 /κ [20]. Thus, for sufficiently weak fields such that E 0 /κ 3 1/a 2 κ 2 the inner region wave function ψ in (r , t ) can be substituted by the field-free bound-state wave function, without affecting the boundary matching.…”

Section: The Time-domain Approachmentioning

confidence: 99%

Nonadiabatic Coulomb effects in strong-field ionization in circularly polarized laser fields

2013

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We develop the recently proposed analytical R-matrix (ARM) method to encompass strong field ionization by circularly polarized fields, for atoms with arbitrary binding potentials. Through the ARM method, the effect of the core potential can now be included consistently both during and after ionization. We find that Coulomb effects modify the ionization dynamics in several ways, including modification of (i) the ionization times, (ii) the initial conditions for the electron continuum dynamics, (iii) the "tunneling angle," at which the electron "enters" the barrier, and (iv) the electron drift momentum. We derive analytical expressions for the Coulomb-corrected ionization times, initial velocities, momentum shifts, and ionization rates in circularly polarized fields, for arbitrary angular momentum of the initial state. We also analyze how nonadiabatic Coulomb effects modify (i) the calibration of the attoclock in the angular streaking method and (ii) the ratio of ionization rates from p − and p + orbitals, predicted by I. Barth and O. Smirnova [Phys. Rev. A 84, 063415 (2011)] for short-range potentials.

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“…Our analysis builds on the approach of Ref. [16], extending the work of Popov and co-workers [17]. It shows the interplay of coordinate-and momentum-space properties of the ionizing orbital in tunnel ionization.…”

mentioning

confidence: 99%

“…Then, at a point z near z ex % I p =F (I p is the ionization potential) we find [16] Èðp x ;p y ;zÞ'Èðp x ;p y ;z 0 Þ ffiffiffiffiffiffiffiffiffiffiffiffiffiffi…”

mentioning

confidence: 99%