Journal
PHYSICAL REVIEW A
Volume 78, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.78.053402
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Funding
- United States National Science Foundation [PHY-0757755, PHY-0555226]
- U.S. Department of Energy through its National Energy Research Scientific Computer Center (NERSC)
- Texas Advanced Computing Center (TACC)
- Direct For Mathematical & Physical Scien
- Division Of Physics [757755] Funding Source: National Science Foundation
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A recently developed [Guan , Phys. Rev. A 76, 053411 (2007)] general ab initio and nonperturbative method to solve the time-dependent Schrodinger equation (TDSE) for the interaction of a strong attosecond laser pulse with a general atom is applied to multiphoton ionization of argon atoms. The field-free Hamiltonian and the dipole matrices are generated using a flexible B-spline R-matrix method, which allows for the use of nonorthogonal sets of one-electron orbitals. The solution of the TDSE is propagated in time using the Arnoldi-Lanczos method. The effects of the pulse length and the laser intensity on the ionization rate for different photon energies are analyzed. In the long-pulse regime, good agreement with predictions from R-matrix Floquet calculations is achieved.
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