Journal
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Volume 54, Issue 17, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6455/ac259c
Keywords
critical screening parameter; screened Coulomb potential; resonance; generalized pseudospectral method; complex-scaling method
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Funding
- National Natural Science Foundation of China [11504128, 11774131, 91850114]
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The critical screening parameters for single-electron systems are calculated with precision, and results for various excited states are compared for accuracy validation. The behaviors of system-bound and pseudo-continuum eigenenergies are shown to follow specific laws, with detailed analysis on the corresponding wave functions. Additionally, it is demonstrated that for systems with non-zero orbital angular momenta, bound states convert into shape-type resonances under certain conditions, with different laws governing the resonance energy and width.
The critical screening parameters for one-electron systems screened by Hulthen, Debye-Huckel, and exponential cosine screened Coulomb potentials are calculated with an accuracy close to the precision of numerical arithmetic. The results for a H atom with an infinitely heavy nucleus are reported from the ground to high-lying excited states, and those for arbitrary two-body charged systems are derived from the Zm-scaling law. A thorough comparison of the critical screening parameters for the ground and the first p-wave excited states with previous predictions is made to demonstrate the accuracy of our calculations. The critical behaviors of system-bound and pseudo-continuum eigenenergies for s- and non-s-wave states are shown to follow the quadratic and linear laws, respectively. The variation of the corresponding wave functions is analyzed in detail. For systems with non-zero orbital angular momenta, the bound states convert into shape-type resonances when the screening parameter exceeds the critical value. The resonance energy shares the same linear law as the pseudo-continuum state, while the resonance width varies by an l-dependent power law. It is further shown that the different asymptotic behaviors of the resonance energy and width are consistent with the complex analog of the Hellmann-Feynman theorem.
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