4<i>fnf</i>doubly excited autoionizing series in barium

Graaff, de R.J.; Ubachs, Wim; Hogervorst, W.

doi:10.1103/physreva.45.166

Cited by 14 publications

(5 citation statements)

References 26 publications

(50 reference statements)

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“…In LS-coupling, the lowest member of the 4fnf Rydberg series corresponds to the 4f' configuration for L + S even and to the 4f5f one for L + S odd. To determine unambiguously the n-value of the 4fnf Rydberg levels observed by de Graaff et al (1991) it is necessary to follow each Rydberg series from its bottom end up to n28, therefore predictions on the 4fnf J=4, 5 and 6 levels with 5 < n < 8 are desirable. Because these levels lie above the bottom energy end of the involved channels, the energy dependence of the MQDT parameters is expected to be less significant for the intermediate 4fnf levels than for the 4f2 ones.…”

Section: Ff J=4 5 6 Doubly-excited Levels Of Bariummentioning

confidence: 99%

R-matrix predictions on 4f²levels and 4fnf Rydberg series of barium with J=4-6

Luc‐Koenig¹,

Aymar²,

Lecomte³

1994

J. Phys. B: At. Mol. Opt. Phys.

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Section: Ff J=4 5 6 Doubly-excited Levels Of Bariummentioning

confidence: 99%

R-matrix predictions on 4f²levels and 4fnf Rydberg series of barium with J=4-6

Luc‐Koenig¹,

Aymar²,

Lecomte³

1994

J. Phys. B: At. Mol. Opt. Phys.

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“…The increase in the number of open channels increases the dimensionality of the space spanned by open channels and is accompanied by an increase in the indirect coupling paths, making it easy to interfere destructively. Numerous spectra in which complete destruction of indirect coupling takes place were reported (Xu et al 1986, De Graaff et al 1992. Besides the introduction of interference between indirect couplings, the incoherent process of background nature adds up to the perturbation due to an interloper.…”

Section: Introductionmentioning

confidence: 99%

Channel coupling between perturbed autoionizing Rydberg series in the presence of an interloper by multichannel quantum defect theory in the systems involving one open and three closed channels

Lee¹,

Kim²,

Gim³

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

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The Rydberg series perturbed by an interloper is one of the important systems showing complex autoionization spectra due to the overlapping resonance. A method restricted to a single lower-lying series, which separates the interloper's spectra from the autoionizing Rydberg series, was extended to a system involving two lower-lying autoionizing series. Using the extended formulation, the coupling between the two lower-lying autoionizing Rydberg series was found to be negligible in the spectrum obtained by Kalyar et al. The formulation, which can be called a merged one, was found when the channel coupling of the two lower-lying series with the remaining series was limited to equal strength. It allowed the spectrum of a four-channel system to be treated similar to that of a three-channel system. The direct coupling between two lower-lying autoionizing series, which is absent in the systems involving only a single lower-lying one, was limited to the topological role within the merged framework. However, a conspicuous phenomenon was observed at the avoided crossing point of two series. An analysis of an interesting phenomenon pertaining to the identical two lower-lying autoionizing series in the four-channel system in relation to the three-channel system was also possible using the merged formulation.

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“…Hence the transitions of the ionic core are nearly undisturbed by the presence of the Rydberg electron. This forms the basis of the well-known method of isolated-core excitation (ICE) [1,2] (see also Fig. 1), which can be conveniently used to create and study doubly excited atomic states.…”

Section: Introductionmentioning

confidence: 99%