Multiphoton inner-shell ionization of the carbon atom

Rey, H. F.; Hart, H. W. van der

doi:10.1103/physreva.92.013417

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…Soon after, the R-matrix theory including time dependence (RMT) [25][26][27][28] was proposed based on the same SP concept with the Bloch operator [29] formalism but directly treating the wave function without the R matrix. The Arnoldi Lanczos scheme [30,31] is exploited in RMT to execute the time propagation more efficiently than in TDRM, and has successfully led to various applications [32][33][34][35][36][37][38]. The TD restricted-and generalized-active-space configurationinteraction [TD-(RAS/GAS)CI] approach [39][40][41] follows the same SP strategy, and is similar to RMT but based on the finite-element discrete-variable-representation (FEDVR) functions (see, e.g., Ref.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent restricted-active-space self-consistent-field theory with space partition

Miyagi

Madsen

2017

Phys. Rev. A

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Aiming at efficient numerical analysis of time-dependent (TD) many-electron dynamics of atoms involving multielectron continua, the TD restricted-active-space self-consistent-field theory with space partition (TD-RASSCF-SP) is presented. The TD-RASSCF-SP wave function is expanded in terms of TD configurationinteraction coefficients with Slater determinants composed of two kinds of TD orbitals:M orbitals are defined to be nonvanishing in the inner region (V), a small volume around the atomic nucleus, andM orbitals are nonvanishing in the large outer region (V). For detailed discussion of the SP strategy, the equations of motion are derived by two different formalisms for comparison. To ensure continuous differentiability of the wave function across the two regions, one of the formalisms makes use of the property of the finite-element discrete-variable-representation (FEDVR) functions and introduces additional time-independent orbitals. The other formalism is more general and is based on the Bloch operator as in the R-matrix theory, but turns out to be less practical for numerical applications. Hence, using the FEDVR-based formalism, the numerical performance is tested by computing double-ionization dynamics of atomic beryllium in intense light fields. To achieve high accuracy,M should be set large to take into account the strong many-electron correlation around the nucleus. On the other hand,M can be set much smaller thanM for capturing the weaker correlation between the two outgoing photoelectrons. As a result, compared with more accurate multiconfigurational TD Hartree-Fock (MCTDHF) method, the TD-RASSCF-SP method may achieve comparable accuracy in the description of the double-ionization dynamics. There are, however, difficulties related to the stiffness of the equations of motion of the TD-RASSCF-SP method, which makes the required time step for this method smaller than the one needed for the MCTDHF approach.

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Section: Introductionmentioning

confidence: 99%

Time-dependent restricted-active-space self-consistent-field theory with space partition

Miyagi

Madsen

2017

Phys. Rev. A

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Photoionization of Electrons in Degenerate Energy Level of Hydrogen Atom Induced by Strong Laser Pulses

Xin

Qiu

et al. 2022

Photonics

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Photoionization dynamics of bounded electrons in the ground state, the first and second excited states of a hydrogen atom, triggered by ultrashort near-infrared laser pulses, have been investigated in a transition regime (γ∼1) that offers both multiphoton and tunneling features. Significant differences in spectral characteristics are found between the three low-energy states. The H(2s) ionization probability is larger than the H(2p) value with a special oscillating structure, but both are much greater than the ground state H(1s) in a wide range of laser intensities. By comparing the momentum spectrum and angular distributions of low-energy photoelectrons released from these degenerate states, we find the H(2p) state shows a stronger long-range Coulomb attraction force than the H(2s) state on account of the difference in the initial electron wave packet. Furthermore, analysis of the photoelectron momentum distributions sheds light on both the first and second excited states with a symmetrical intercycle interference structure in a multicycle field but an intracycle interference of an asymmetric left-handed or right-handed rotating spectrum in a few-cycle field. By analyzing photoelectron spectroscopy, we identify the parity characteristics of photoelectrons in different energy intervals and their corresponding above-threshold single-photon ionization (ATSI) or above-threshold double-photon ionization (ATDI) processes. We finally present the momentum distributions of the electrons ionized by laser pulses with different profiles and find the carrier-envelope phase (CEP) is a strong factor in deciding the rotating structure of the emission spectrum, which provides a new method to distinguish the CEP of few-cycle pulses.

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Multiphoton inner-shell ionization of the carbon atom

Cited by 2 publications

References 29 publications

Time-dependent restricted-active-space self-consistent-field theory with space partition

Time-dependent restricted-active-space self-consistent-field theory with space partition

Photoionization of Electrons in Degenerate Energy Level of Hydrogen Atom Induced by Strong Laser Pulses

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