Field ionization process of Eu 4f<sup>7</sup>6s<i>n</i>p Rydberg states

Zhang, Jing; Lv, Shen; Dai, Chao

doi:10.1088/1674-1056/24/11/113201

Cited by 2 publications

(1 citation statement)

References 25 publications

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“…For the last decade, spectra of highly excited states of rare-earth atoms [1][2][3] have attracted considerable attention. Although the position and width, as well as the line shape of an auto-ionizing resonance on both Eu and Sm atoms, have been reported, [4][5][6] they are only relevant to total cross section of auto-ionization, yielding no information on the dynamical process of auto-ionization, such as the final states of ions, and phases of the wave function of the ejected electrons.…”

Section: Introductionmentioning

confidence: 99%

Branching ratio and angular distribution of ejected electrons from Eu 4f ⁷ 6p _1/2 n d auto-ionizing states

Zhang

et al. 2016

Chinese Phys. B

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The branching ratios of ions and the angular distributions of electrons ejected from the Eu 4f 7 6p 1/2 nd auto-ionizing states are investigated with the velocity-map-imaging technique. To populate the above auto-ionizing states, the relevant bound Rydberg states have to be detected first. Two new bound Rydberg states are identified in the region between 41150 cm −1 and 44580 cm −1 , from which auto-ionization spectra of the Eu 4f 7 6p 1/2 nd states are observed with isolated core excitation method. With all preparations above, the branching ratios from the above auto-ionizing states to different final ionic states and the angular distributions of electrons ejected from these processes are measured systematically. Energy dependence of branching ratios and anisotropy parameters within the auto-ionization spectra are carefully analyzed, followed by a qualitative interpretation.

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Section: Introductionmentioning

confidence: 99%

Branching ratio and angular distribution of ejected electrons from Eu 4f ⁷ 6p _1/2 n d auto-ionizing states

Zhang

et al. 2016

Chinese Phys. B

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Study of Eu 4f76snl Rydberg states

Chang¹,

Lv²,

Xiao-Rui³

et al. 2017

Acta Phys. Sin.

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The three-step two-color resonant ionization method and three-step three-color isolated-core excitation (ICE) technique are used to study the spectra of the highly excited bound states systematically, either Eu 4f76snl Rydberg states or other valence states converging to the higher ionization limits. Specifically, the highly excited bound states are populated from the ground state via three different 4f76s6p intermediate states, thereby establishing the three different excitation schemes. The schemes are designed to allow us to assign a J-quantum number uniquely to a given highly excited state with the selection rules of J-quantum number for each excitation scheme by comparing their corresponding photoionization spectra, which are obtained with three-step two-color resonant ionization method. By tuning the wavelength of the second laser, the 56 highly excited bound states located in the energy region between 42250 cm-1 and 44510 cm-1 are detected. To explore their spectroscopic information, more efforts have been made 1) to judge whether an excited state is a bound Rydberg state and to observe whether it may be excited further to an autoionizing state by using the ICE technique; 2) to deduce the principal quantum number of the given bound Rydberg states, and to observe whether they are converged to the same ionization limit by calculating their quantum defects with respect to several ionization limits. Based on the above manipulations, all detected highly excited bound states can be classified as the two categories: bound Eu 4f76snl Rydberg states and other valence states converging to the higher ionization limits, such as the Eu 4f75dnl states. Specifically, to fulfill the ICE technique, it is necessary to make a resonance transition from the 4f76snl Rydberg states to the 4f76p1/2nl autoionizing states with the third dye laser whose wavelength is scanned around the Eu 4f76s+-4f76p1/2+ ionic line. Once the Eu 4f76snl Rydberg states are recognized with the ICE technique, the identification of their orbital quantum numbers is a primary task to determine their electron configurations. With all the efforts mentioned and existing information, three Rydberg states can be assigned to the 4f76s10s(8S9/2), 4f76s9d(8D9/2) and 4f76s9d(6D7/2), whereas the rest can be regarded as highly excited valence states.

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Field ionization process of Eu 4f⁷6snp Rydberg states

Cited by 2 publications

References 25 publications

Branching ratio and angular distribution of ejected electrons from Eu 4f ⁷ 6p _1/2 n d auto-ionizing states

Branching ratio and angular distribution of ejected electrons from Eu 4f ⁷ 6p _1/2 n d auto-ionizing states

Study of Eu 4f76snl Rydberg states

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Field ionization process of Eu 4f76snp Rydberg states

Cited by 2 publications

References 25 publications

Branching ratio and angular distribution of ejected electrons from Eu 4f 7 6p 1/2 n d auto-ionizing states

Branching ratio and angular distribution of ejected electrons from Eu 4f 7 6p 1/2 n d auto-ionizing states

Study of Eu 4f76snl Rydberg states

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Field ionization process of Eu 4f⁷6snp Rydberg states

Branching ratio and angular distribution of ejected electrons from Eu 4f ⁷ 6p _1/2 n d auto-ionizing states

Branching ratio and angular distribution of ejected electrons from Eu 4f ⁷ 6p _1/2 n d auto-ionizing states