Strong-field atomic stabilization: numerical simulation and analytical modelling

Popov, A. M.; Тихонова, О. В.; Волкова, Е. А.

doi:10.1088/0953-4075/36/10/201

Cited by 106 publications

(71 citation statements)

References 112 publications

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“…and ε 0 > 8 a.u. This is the well-known strong-field atomic stabilization phenomenon [66][67][68][69][70][71][72]. This phenomenon can occur at any frequency and can be enhanced by relativistic effects [70].…”

Section: Fig 2 (Color Online)mentioning

confidence: 98%

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Precision calculation of above-threshold multiphoton ionization in intense short-wavelength laser fields: The momentum-space approach and time-dependent generalized pseudospectral method

Zhou

Chu

2011

Phys. Rev. A

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We present an approach in momentum (P) space for the accurate study of multiphoton and above-threshold ionization (ATI) dynamics of atomic systems driven by intense laser fields. In this approach, the electron wave function is calculated by solving the P-space time-dependent Schrödinger equation (TDSE) in a finite P-space volume under a simple zero asymptotic boundary condition. The P-space TDSE is propagated accurately and efficiently by means of the time-dependent generalized pseudospectral method with optimal momentum grid discretization and a split-operator time propagator in the energy representation. The differential ionization probabilities are calculated directly from the continuum-state wave function obtained by projecting the total electron wave function onto the continuum-state subspace using the projection operator constructed by the continuum eigenfunctions of the unperturbed Hamiltonian. As a case study, we apply this approach to the nonperturbative study of the multiphoton and ATI dynamics of a hydrogen atom exposed to intense shortwavelength laser fields. High-resolution photoelectron energy-angular distribution and ATI spectra have been obtained. We find that with the increase of the laser intensity, the photoelectron energy-angular distribution changes from circular to dumbbell shaped and is squeezed along the laser field direction. We also explore the change of the maximum photoelectron energy with laser intensity and strong-field atomic stabilization phenomenon in detail.

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Section: Fig 2 (Color Online)mentioning

confidence: 98%

“…This phenomenon can occur at any frequency and can be enhanced by relativistic effects [70]. Detailed discussions about the strong-field atomic stabilization and various physical mechanisms have been given in recent review papers [71,72].…”

Section: Fig 2 (Color Online)mentioning

confidence: 99%

Precision calculation of above-threshold multiphoton ionization in intense short-wavelength laser fields: The momentum-space approach and time-dependent generalized pseudospectral method

Zhou

Chu

2011

Phys. Rev. A

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“…For typical ω's considered in this work, e.g. 2-3, the outershells satisfy ω > I p where we expect stabilization, while innershell electrons can be excited to Rydberg states by multiphoton absorption and subsequently be stabilized [28,29]. Now consider b).…”

Section: Spectramentioning

confidence: 93%

Characterization of Molecular Breakup by Very Intense Femtosecond XUV Laser Pulses

Yue

Madsen

2015

Phys. Rev. Lett.

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We study the breakup of H + 2 exposed to super-intense, femtosecond laser pulses with frequencies greater than that corresponding to the ionization potential. By solving the time-dependent Schrödinger equation in an extensive field parameter range, it is revealed that highly nonresonant dissociation channels can dominate over ionization. By considering field-dressed Born-Oppenheimer potential energy curves in the reference frame following a free electron in the field, we propose a simple physical model that characterizes this dissociation mechanism. The model is used to predict control of vibrational excitation, magnitude of the dissociation yields, and nuclear kinetic energy release spectra. Finally, the joint energy spectrum for the ionization process illustrates the energy sharing between the electron and the nuclei and the correlation between ionization and dissociation processes. [8,9], and rescattering induced dissociation [10]. All these processes were discovered in the low-frequency regime where absorption of several photons is needed to reach a breakup channel. Depending on the laser parameters, either dissociation or ionization dominates [11][12][13].With advancements in light-source technology, extreme-ultraviolet (XUV) laser pulses of femto-and subfemtosecond duration are now produced from highorder harmonic [14][15][16][17] or free-electron lasers [18,19]. New focusing techniques [20][21][22] led to XUV femtosecond (fs) pulses with peak intensities I ≥ 4 × 10 17 W/cm 2 [23]. Intense XUV pulses were, e.g., applied on rare gases to study sequential versus non-sequential multiple ionization [24,25], and creation of charge states up to 21 in Xe was observed [21]. For molecules, experiments on HeH + [26] and N 2 [27] provided benchmark data for theory. The high-frequency regime is defined in this work as the regime where one-photon ionization is allowed. Since the photon resonance is much closer to the threshold for ionization than for dissociation, ionization is at first glance expected to dominate.Here we characterize some hitherto unobserved molecular breakup phenomena in the regime of super-intense, high-frequency, fs pulses, supplementing the phenomena known from the low-frequency regime, and adding insight to the general field of strong laser-matter interaction. The characteristics we find include (a) even with full inclusion of nuclear dynamics, stabilization against ionization occurs, i.e., the ionization yield does not necessarily increase with intensity [28,29]; (b) a mechanism by which dissociation, in contrast to the expectation from energy considerations, completely dominates over ionization; (c) control over the vibrational distribution, dissociation yield, and nuclear kinetic energy release (NKER) spectra by the parameters of the laser pulse; (d) insight into the energy sharing between electronic and nuclear degrees of freedom, as displayed by the joint energy spectrum (JES).We consider H + 2 , a molecule that was used to discover many low-frequency processes that were later observed in m...

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“…It therefore came as a big surprise to many when, more than 20 years ago, theoretical studies of atomic hydrogen in ultraintense, high-frequency laser fields showed some evidence of the complete opposite scenario, i.e., that the atom may eventually become more stable as the ionizing radiation gets stronger [3][4][5][6][7][8][9][10][11]. This rather counterintuitive phenomenon, called atomic stabilization, has since then been studied extensively; see, e.g., [12][13][14][15] and references therein. It has also been argued that atomic stabilization has a classical counterpart [16,17].…”

Section: Introductionmentioning

confidence: 99%

Stabilization of circular Rydberg atoms by circularly polarized infrared laser fields

et al. 2011

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The ionization dynamics of circular Rydberg states in strong circularly polarized infrared (800 nm) laser fields is studied by means of numerical simulations with the time-dependent Schrödinger equation. We find that at certain intensities, related to the radius of the Rydberg states, atomic stabilization sets in, and the ionization probability decreases as the intensity is further increased. Moreover, there is a strong dependence of the ionization probability on the rotational direction of the applied laser field, which can be understood from a simple classical analogy.

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Strong-field atomic stabilization: numerical simulation and analytical modelling

Cited by 106 publications

References 112 publications

Precision calculation of above-threshold multiphoton ionization in intense short-wavelength laser fields: The momentum-space approach and time-dependent generalized pseudospectral method

Precision calculation of above-threshold multiphoton ionization in intense short-wavelength laser fields: The momentum-space approach and time-dependent generalized pseudospectral method

Characterization of Molecular Breakup by Very Intense Femtosecond XUV Laser Pulses

Stabilization of circular Rydberg atoms by circularly polarized infrared laser fields

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