Experimental and theoretical study of the hyperfine structure in the 4[ital f][sup 7]5[ital d]6[ital s]6[ital p] configuration of Gd I

Journal Article · Wed Dec 01 04:00:00 EST 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.48.4500· OSTI ID:5800258

Kronfeldt, H; Klemz, G; Kroeger, S ^[1]; Wyart, J ^[2]

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1. Optisches Institut, Technische Universitaet Berlin, Hardenbergstraase 36, 10623 Berlin (Germany)
2. Laboratoire Aime Cotton, CNRS II, Centre Universitaire, Batiment 505, 91405 Orsay (France)

A parametric hyperfine-structure (hfs) analysis of 24 excited even-parity levels of the 4[ital f][sup 7]5[ital d]6[ital s]6[ital p] configuration in Gd I was performed. The interpretation has been carried out based on a refined multiconfigurational fine-structure (fs) calculation taking altogether 177 assignments into account. The set of fs parameters as well as the leading eigenvector percentages of levels relevant for this paper are given. [ital SL]-limit effective-operator expressions are presented for the magnetic-dipole and electric-quadrupole hfs of arbitrary states built from four open electron shells. The following single-electron hfs parameters [ital a][sub 6[ital s]][sup 10] and [ital b][sub 6[ital p]][sup 02] were deduced for [sup 155]Gd, [ital a][sub 6[ital s]][sup 10]=[minus]1270(22) MHz, [ital b][sub 6[ital p]][sup 02]=1507(26) MHz and for [sup 157]Gd, [ital a][sub 6[ital s]][sup 10]=[minus]1668(28) MHz, [ital b][sub 6[ital p]][sup 02]=1603(29) MHz. For the odd-parity level 4[ital f][sup 7]5[ital d]6[ital s][sup 2] [sup 7][ital D][sub 4] the magnetic-dipole [ital A] and electric-quadrupole [ital B] hfs constants were found to be [sup 155][ital A]=[minus]11.3(2.1) MHz, [sup 155][ital B]=54(9) MHz, [sup 157][ital A]=[minus]14.8(2.7) MHz, and [sup 157][ital B]=58(10) MHz. The validity of all single-electron hfs parameters was checked using general trends of the corresponding [l angle][ital r][sup [minus]3][r angle][sub [ital n][ital l]][sup [ital k]][sub [ital s]k[ital l]] values known for the series of the lanthanides. Finally, the evaluation of the electric nuclear quadrupole moment is discussed.

• OSTI ID: 5800258
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 48:6; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOMIC PHYSICS
DIPOLES
ELEMENTS
FLUORESCENCE
FREQUENCY RANGE
GADOLINIUM
HYPERFINE STRUCTURE
ISOTOPE EFFECTS
LUMINESCENCE
MAGNETIC DIPOLES
METALS
MHZ RANGE
MULTIPOLES
PHYSICS
QUADRUPOLE MOMENTS
RARE EARTHS
RESONANCE FLUORESCENCE