Properties of Fr-like Th{sup 3+} from spectroscopy of high-L Rydberg levels of Th{sup 2+}
Journal Article
·
· Physical Review. A
- Department of Physics, Colorado State University, Fort Collins, Colorado 80523 (United States)
Binding energies of high-L Rydberg states (L{>=} 7) of Th{sup 2+} with n = 27-29 were studied using the resonant excitation Stark ionization spectroscopy (RESIS) method. The core of the Th{sup 2+} Rydberg ion is the Fr-like ion Th{sup 3+} whose ground state is a 5 {sup 2}F{sub 5/2} level. The large-core angular momentum results in a complex Rydberg fine-structure pattern consisting of six levels for each value of L that is only partially resolved in the RESIS excitation spectrum. The pattern is further complicated, especially for the relatively-low-L levels, by strong nonadiabatic effects due to the low-lying 6d levels. Analysis of the observed RESIS spectra leads to determination of five properties of the Th{sup 3+} ion: its electric quadrupole moment Q = 0.54(4); its adiabatic scalar and tensor dipole polarizabilities {alpha}{sub d,0} = 15.42(17) and {alpha}{sub d,2} = -3.6(1.3); and the dipole matrix elements connecting the ground 5 {sup 2}F{sub 5/2} level to the low-lying 6 {sup 2}D{sub 3/2} and 6 {sup 2}D{sub 5/2} levels, |<5 {sup 2}F{sub 5/2}||D||6{sup 2}D{sub 3/2}>|=1.435(10) and |<5{sup 2}F{sub 5/2}||D||6{sup 2}D{sub 5/2}>|=0.414(24). All are in atomic units. These are compared with theoretical calculations.
- OSTI ID:
- 21550090
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 83; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR MOMENTUM
BINDING ENERGY
CHARGED PARTICLES
DIPOLES
ELECTRICAL PROPERTIES
ENERGY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FINE STRUCTURE
IONIZATION
IONS
MATRIX ELEMENTS
MULTIPOLES
PHYSICAL PROPERTIES
POLARIZABILITY
QUADRUPOLE MOMENTS
RYDBERG STATES
SPECTRA
SPECTROSCOPY
STARK EFFECT
THORIUM IONS
ANGULAR MOMENTUM
BINDING ENERGY
CHARGED PARTICLES
DIPOLES
ELECTRICAL PROPERTIES
ENERGY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FINE STRUCTURE
IONIZATION
IONS
MATRIX ELEMENTS
MULTIPOLES
PHYSICAL PROPERTIES
POLARIZABILITY
QUADRUPOLE MOMENTS
RYDBERG STATES
SPECTRA
SPECTROSCOPY
STARK EFFECT
THORIUM IONS