Photoabsorption spectra of the heavy alkali-metal negative ions

Greene, Chris H.

doi:10.1103/physreva.42.1405

Cited by 69 publications

(50 citation statements)

References 34 publications

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“…However, it has been suggested [16] that due to the large polarizability of the Cs atom it can support the P bound state instead of the resonance. Recent accurate bound-state calculations [17,18] confirmed this assumption and gave values for the energy of the bound state that are quite close to the first estimate [16].…”

Section: Resultssupporting

confidence: 53%

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Collisional broadening of Rydberg states by alkali-metal perturbers

1991

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Collisional broadening of nS Rydberg states by K, Rb, and Cs atoms is studied using the adiabatic approach for the 'X quasimolecular state and impulse approximation for all other contributions to the collisional width. The calculations are based on the use of the low-energy phase shifts for electron scattering by alkali metals obtained from ab initio close-coupling calculations and their extrapolation according to the modified effective range theory. We obtain a good agreement for the magnitude of the width with experimental data and satisfactory agreement for the oscillatory part of the width as a function of the principal quantum number. We find that the theory overestimates the amplitude of the oscillations. In the case of Cs as a perturber, the agreement with experimental data is good if we assume the existence of the low-energy P resonance of Cs . However, recent ab initio bound-state and scattering calculations indicate the existence of the Cs ('P) bound state rather than the resonance.PACS number(s): 32.70.Jz, 34.60.+ z

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Section: Resultssupporting

confidence: 53%

“…On the one hand, the early prediction [16] and recent ab initio calculations [17][18][19]yield a P bound state for Cs . This is also supported by accurate ttb initio scattering calculations [19,20].…”

Section: Discussionmentioning

confidence: 99%

Collisional broadening of Rydberg states by alkali-metal perturbers

1991

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“…The electron affinities of the atoms up to Cs are known with great precision [160], but only a semiempirical value of 492 meV (with an uncertainty of 2.2%) is available for Fr [175]. An interesting aspect of the alkali systems is the suggestion made some years ago [176][177][178] that Cs − might have bound excited states, an idea refuted by more recent experimental [179] and theoretical [175] work. One of the first applications of the relativistic Fock-space coupled cluster (FSCC) method has been to transition energies of alkali atoms [131].…”

Section: Electron Affinities Of E119 and Other Alkali Atoms -Accuracymentioning

confidence: 98%

Electronic structure theory of the superheavy elements

2015

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“…The latter calculations are carried out along the same lines developed in a recent treatment [15] of the alkali-metal negative ions Rb Cs, and Fr . This fully jj-coupled approach is expected to give a much more realistic description of spin-orbit effects when they are important, and accordingly the comparison of the two types of calculation will help to clarify the range of validity of frame transformation calculations in general.…”

Section: Introductionmentioning

confidence: 99%

Spin-orbit effects in the heavy alkaline-earth atoms

1991

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Complex bound and autoionizing spectra of strontium, barium, and radium are treated at two different levels of approximation using multichannel-quantum-defect techniques (MQDT) and eigenchannel R-matrix calculations. In the first level, the R-matrix calculations are conducted entirely in LS coupling without explicitly including any spin-orbit terms in the Hamiltonian.A subsequent frame transformation to jj coupling is then carried out prior to the MQDT treatment. In the second level, the entire R-matrix calculation is conducted in jj coupling, including spin-orbit terms in the Hamiltonian explicitly within the R-matrix box. The two methods give nearly identical results even for atoms as heavy as barium, each showing good agreement with experiment, but significant differences begin to appear between the two levels of approximation for atomic radium.

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Photoabsorption spectra of the heavy alkali-metal negative ions

Cited by 69 publications

References 34 publications

Collisional broadening of Rydberg states by alkali-metal perturbers

Collisional broadening of Rydberg states by alkali-metal perturbers

Electronic structure theory of the superheavy elements

Spin-orbit effects in the heavy alkaline-earth atoms

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