The Journal of Chemical Physics

1989

DOI: 10.1063/1.457470

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Core effects in atomic resonances. A comparison between 1,3P (3l 3l′) states of He-like and Be-like systems

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Abstract: We report a study of the effect of a lr core on the properties of doubly excited states, choosing as benchmark the two lowest 1,3 pO (31 31 ') resonances of He-and Be-like systems, and using the pseudopotential Feshbach method recently proposed by Martin et al.

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Cited by 7 publications

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“…(8) The spectrum of Ho (and of H) contains a discrete, Rydberg series part for each open channel,u (1s, 2s, 2p, ... ). In practice, Eq.…”

Section: Feshbach Formalismmentioning

confidence: 99%

Fully L2 methods for multichannel scattering problems. Partial widths

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1991

The Journal of Chemical Physics

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Articles you may be interested inL 2 methods for multichannel continua AIP Conf. Proc. 295, 316 (1993); 10.1063/1.45224 L2 golden rule method to calculate partial widths for the decay of resonance states J. Chem. Phys. 88, 3667 (1988); 10.1063/1.453866 L2 amplitude density method for multichannel inelastic and rearrangement collisionsWe analyze the use of L 2 discretization methods to calculate, in the framework of the Feshbach theory, partial and total widths of resonances lying in multichannel continua. When interchannel coupling is strong, partial widths cannot be obtained without solving the scattering equations and for this purpose a fully L 2 method is proposed, starting from the static exchange approximation as a zeroth order result. For weak interchannel coupling, we study the validity of Born-type approximations and we justify why neglecting this coupling may be appropriate to evaluate total widths even for cases where it is totally inadequate for the corresponding partial ones. The methods proposed are illustrated for moderately strong (He) and weak (0 6 + ) coupling in atomic resonances.

“…(8) The spectrum of Ho (and of H) contains a discrete, Rydberg series part for each open channel,u (1s, 2s, 2p, ... ). In practice, Eq.…”

Section: Feshbach Formalismmentioning

confidence: 99%

Fully L2 methods for multichannel scattering problems. Partial widths

¹

,

²

,

³

1991

The Journal of Chemical Physics

Self Cite

View full text Add to dashboard Cite

Articles you may be interested inL 2 methods for multichannel continua AIP Conf. Proc. 295, 316 (1993); 10.1063/1.45224 L2 golden rule method to calculate partial widths for the decay of resonance states J. Chem. Phys. 88, 3667 (1988); 10.1063/1.453866 L2 amplitude density method for multichannel inelastic and rearrangement collisionsWe analyze the use of L 2 discretization methods to calculate, in the framework of the Feshbach theory, partial and total widths of resonances lying in multichannel continua. When interchannel coupling is strong, partial widths cannot be obtained without solving the scattering equations and for this purpose a fully L 2 method is proposed, starting from the static exchange approximation as a zeroth order result. For weak interchannel coupling, we study the validity of Born-type approximations and we justify why neglecting this coupling may be appropriate to evaluate total widths even for cases where it is totally inadequate for the corresponding partial ones. The methods proposed are illustrated for moderately strong (He) and weak (0 6 + ) coupling in atomic resonances.

Partial widths of resonances by analytic continuation from real eigenvalues

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1990

Chemical Physics Letters

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Calculation of partial widths for autoionization of the 1P (3s3p) resonance state of helium

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1990

The Journal of Chemical Physics

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Partial widths for the autoionization of He** 1P (3s3p) into various decay channels are calculated by an analytic continuation method that makes use only of real eigenvalues from stabilization graphs. Agreement with experiment and with more elaborate theoretical calculations is satisfactory, more closely in accord with the latter where discrepancies exist.

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