Photon-momentum transfer in one- and two-photon ionization of atoms

Wang, Mu-Xue; Xiao, Xue; Liang, Hao; Chen, Si-Ge; Peng, Liang-You

doi:10.1103/physreva.96.043414

Cited by 15 publications

(13 citation statements)

References 54 publications

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“…The Hamiltonian ( 4) is widely used when one considers the nondipole effect in the ionization dynamics [1,[19][20][21][22]28]. In the literature, there are many other choices of gauge [33,56,57], though it is hard to relate a physical meaning to each of those nondipole terms.…”

Section: A Choice Of the Gaugementioning

confidence: 99%

“…In order to study the nondipole effect theoretically, different methods can be adopted, such as a numerical solution to the time-dependent Schrödinger equation (TDSE) beyond the dipole approximation [19][20][21][22], or directly to the Dirac equation [23]. In the tunnelling regime, one can also turn to the adapted strong field approximation [3,[24][25][26][27][28][29] and the modified classical trajectory Monte Carlo method [8,30,31].…”

Section: Introductionmentioning

confidence: 99%

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Photon-momentum transfer in diatomic molecules: An ab initio study

et al. 2018

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For a molecule, the two-center interference and the molecular scattering phase of the electron are important for almost all the processes that may occur in a laser field. In this study, we investigate their effects in the transfer of linear photon momentum to the ionized electron by absorbing a single photon. The time-dependent Schrödinger equation of H + 2 is numerically solved in the multipolar gauge in which the electric quadrupole term and the magnetic dipole term are explicitly expressed. This allows us to separate the contributions of the two terms in the momentum transfer. For different configurations of the molecular and the laser orientation, the transferred momentum to the electron is evaluated at different internuclear distances with various photon energies and two-center interferences are identified in the whole region. At small electron energies and small internuclear distances, we find significant deviations from the prediction of the classical double-slit model due to the strong mediation of the Coulomb potential. Finally, even for a large internuclear distance, our results show that a varying molecular scattering phase is important at all electron energies, which is beyond the simple prediction of the linear combination of the atomical orbitals.

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Section: A Choice Of the Gaugementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photon-momentum transfer in diatomic molecules: An ab initio study

et al. 2018

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“…Remarkably, nondipole effects can be enhanced along two rather different routes-either by reducing the laser wavelength such that it approaches the atomic scale thereby probing the inhomogeneity of the electromagnetic field. This gives rise to a photoelectron angular distribution deviating from the dipole shape [2][3][4][5][6][7]. Alternatively, nondipole effects can also be enhanced by increasing the laser wavelength and/or increasing the intensity so that the motion of the liberated electron is strongly influenced by the magnetic field and radiation pressure of the laser field, resulting in linear momentum transfer along the propagation direction [8][9][10][11][12][13][14][15][16][17][18].…”

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confidence: 99%

Theory of Subcycle Linear Momentum Transfer in Strong-Field Tunneling Ionization

Brennecke

Gao

et al. 2020

Phys. Rev. Lett.

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“…The Hamiltonian in the LG and the VG, respectively, is given by [7,28,29] (atomic units are used throughout this Letter unless otherwise stated),…”

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“…The LG form of the Hamiltonian is derived through the Power-Zienau-Woolley transformation [30,31] from the minimal-coupling Hamiltonian and is kept to the first-order expansion. The VG form of the Hamiltonian is obtained from the minimalcoupling Hamiltonian expanded to the first order with the removal of the A 2 ðtÞ term [28]. The VG form of the Hamiltonian has been applied in simulations for hydrogen [32] and for helium [33] with high intensities at 10 17 -10 20 W cm 2 .…”

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confidence: 99%