Interference Oscillations in the Angular Distribution of Laser-Ionized Electrons near Ionization Threshold

Arbó, D. G.; Yoshida, Shuhei; Persson, Emil; Dimitriou, Konstantinos; Burgdorfer, J.

doi:10.1103/physrevlett.96.143003

Cited by 151 publications

(167 citation statements)

References 35 publications

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“…It comprises several radial stripes spreading out from the center. These stripes are induced by the long-range Coulomb potential and are related to the fact that the ATI peak is determined by one dominant partial wave in the final state [15,17]. The number of the stripes equals the angular momentum quantum number of the dominant partial wave in the final state plus one [15,17,18,63].…”

Section: B Multiphoton Above-threshold Ionization Of Hydrogen Atom Imentioning

confidence: 99%

“…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%

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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: B Multiphoton Above-threshold Ionization Of Hydrogen Atom Imentioning

confidence: 99%

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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“…6 follows from the impulsive momentum transfer during the longitudinal velocity reversal at the turning point close to the nucleus in the (first) subsequent half-cycle while Eq. 7 follows from the locking of the quiver motion onto the asymptotic Kepler hyperbola [14]. Note that the final coordinates (E i , L i ) for electrons emitted during the ionization burst near the i-th field maximum are primarily determined by the field strength of the subsequent field maximum F 0,i+1 .…”

mentioning

confidence: 99%

“…At the end of the pulse the asymptotic momentum distribution is determined analytically by propagating along Kepler orbits [14].…”

mentioning

confidence: 99%

Low-energy peak structure in strong-field ionization by midinfrared laser pulses: Two-dimensional focusing by the atomic potential

et al. 2012

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We analyze the formation of the low-energy structure (LES) in above-threshold ionization spectra first observed by Quan et al. [1] and Blaga et al.[2] using both quasi-classical and quantum approaches. We show this structure to be largely classical in origin resulting from a two-dimensional focusing in the energy-angular momentum plane of the strong-field dynamics in the presence of the atomic potential. The peak at low energy is strongly correlated with high angular momenta of the photoelectron. Quantum simulations confirm this scenario. Resulting parameter dependences agree with experimental findings [1,2] and, in part, with other simulations [3][4][5].

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“…In the tunneling regime, on the other hand, recent experiments [12,13] with linearly polarized lasers have shown structures in the momentum distribution of the photoionized electrons in rare gases which have not been fully understood so far. The role of interference in few-cycle pulses is actually been both theoretically and experimentally investigated [14,15,16].…”

Section: Introductionmentioning

confidence: 99%

Ionization of the hydrogen atom by intense ultrashort laser pulses

2008

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The ionization of atomic hydrogen in intense laser fields is studied theoretically. The calculations were performed applying both quantummechanical and classical approaches. Treating the problem quantummechanically, the time dependent Schrödinger equation (TDSE) of our system was first transformed into a pseudo-momentum space and solved in this space iteratively. While neglecting the Coulomb potential during the solution of the TDSE we got the results in the Volkov approximation, in the first order solution we taken into account the Coulomb potential as perturbation. The classical calculations were performed within the framework of the classical trajectory Monte-Carlo (CTMC) method.The double differential ionization probabilities are calculated for different laser pulses and a reasonable agreement was found between the theories. Major differences can be observed in the angular distribution of electrons at low electron energies between classical and the quantummechanical approaches. At high electron energies the differences disappear, which indicates that the generation of low energy electrons is of quantum type, and it is strongly influenced by the Coulomb potential, while the production of high energy electrons is of classical type and it is less influenced by the Coulomb interaction. Our results are also compared with the Coulomb-Volkov (CV) model calculations.

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Interference Oscillations in the Angular Distribution of Laser-Ionized Electrons near Ionization Threshold

Cited by 151 publications

References 35 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

Low-energy peak structure in strong-field ionization by midinfrared laser pulses: Two-dimensional focusing by the atomic potential

Ionization of the hydrogen atom by intense ultrashort laser pulses

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