Dynamics of strong-field above-threshold ionization of argon: Comparison between experiment and theory

Wiehle, R.; Witzel, B.; Helm, H.; Cormier, Éric

doi:10.1103/physreva.67.063405

Cited by 99 publications

(78 citation statements)

References 14 publications

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“…The angular distribution of any resonant-enhanced contribution should reflect the symmetry of the state through which ionization has occurred [7]. This can result in an atomic species dependence of the data, in particular, in different behaviour in the ultra-low energy region, as observed in Fig.3.…”

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confidence: 99%

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Resonant structures in the low-energy electron continuum for single ionization of atoms in the tunnelling regime

Rudenko¹,

Zrost²,

Schröter³

et al. 2004

J. Phys. B: At. Mol. Opt. Phys.

194

177

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We present results of high-resolution experiments on single ionization of He, Ne and Ar by ultra-short (25 fs, 6 fs) 795 nm laser pulses at intensities 0.15 -2.0. 10 15 W/cm 2 . We show that the ATI-like pattern can survive deep in the tunneling regime and that the atomic structure plays an important role in the formation of the low-energy photoelectron spectra even at high intensities. The absence of ponderomotive shifts, the splitting of the peaks and their degeneration for few-cycle pulses indicate that the observed structures originate from a resonant process.

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confidence: 99%

“…Usually, ionization is considered as either a "multiphoton" or "tunnelling" process depending on the value of the so-called Keldysh parameter ponderomotive effects, channel-opening and closing etc. were studied, and good agreement between theory and experiment has been achieved [2][3][4][5][6][7].…”

mentioning

confidence: 99%

Resonant structures in the low-energy electron continuum for single ionization of atoms in the tunnelling regime

Rudenko¹,

Zrost²,

Schröter³

et al. 2004

J. Phys. B: At. Mol. Opt. Phys.

194

177

View full text Add to dashboard Cite

show abstract

“…Extensive investigations have been performed both theoretically [11][12][13][14][15][16][17][18] and experimentally [7,12,14,[19][20][21][22][23][24][25][26][27][28][29][30][31] for a comprehensive understanding of the laser-induced atomic ATI for laser fields with wavelengths from visible lights (4×10 2 nm) to infrared radiations (1×10 5 nm). With the recent development of intense and ultrashort-wavelength free-electron lasers [32][33][34], the study of multiphoton * zyzhou@ku.edu † sichu@ku.edu processes in the high-frequency and strong-field regime becomes increasingly important [35][36][37].…”

Section: Introductionmentioning

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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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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“…[10] It is widely believed that the high-energy electron is related to the rescattering (recollision) mechanism, [11] while the low-energy part is believed to originate in direct photo-ionization. To date, little research [12][13][14][15] has been reported on the intensity dependence of the low-energy structure (LES), especially for a detailed comparison of the current state-of-the-art theory and the experimental data.…”

Section: Introductionmentioning

confidence: 99%

Low-energy structure in the ionization of argon: Comparison of experiment with theory

Feng¹,

Chu²,

Li³

2013

Chinese Phys. B

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The above-threshold ionization of argon in an intense 70-fs, 400-nm linearly polarized laser pulse has been investigated by the velocity map imaging techniques, combined with an attosecond-resolution quantum wave packet dynamics method. There is a quantitative agreement in all dominant features between the experiment and the theory. Moreover, a peak-splitting phenomenon in the first energy peak has been observed at high pulse intensity. Further, through the theoretical analysis, an ac Stark splitting with evident resonant and nonresonant ionization pathways has been found to be the physical reason for the experimental observations.

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Dynamics of strong-field above-threshold ionization of argon: Comparison between experiment and theory

Cited by 99 publications

References 14 publications

Resonant structures in the low-energy electron continuum for single ionization of atoms in the tunnelling regime

Resonant structures in the low-energy electron continuum for single ionization of atoms in the tunnelling regime

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

Low-energy structure in the ionization of argon: Comparison of experiment with theory

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