Spectrum and energy levels of Y VI
The spectrum of the five-times-ionized yttrium atom (Y VI), excited in a sliding-spark discharge, was studied in the 160--2500 A-circle range. About 900 Y VI lines were classified as transitions between 101 odd and 69 even energy levels.The energy-level system established includes almost all levels of the 4s-italic/sup 2/4p-italic/sup 4/, 4s-italic4p-italic/sup 5/, 4s-italic/sup 2/4p-italic/sup 3/4d-italic, 5d-italic, 5s-italic, 6s-italic, and 5p-italic configurations and a number of levels of the 7s-italic, 4f-italic, and 4s-italic4p-italic/sup 4/4d-italic configurations. The observed level system has been theoretically interpreted by means of Hartree--Fock calculations and least-squares parametric fits. Strong configuration mixings are found between the 4s-italic4p-italic/sup 5/ and 4s-italic/sup 2/4p-italic/sup 3/4d-italic configurations, between the 4s-italic/sup 2/4p-italic/sup 3/5p-italic and 4s-italic4p-italic/sup 4/4d-italic configurations, and between the 4s-italic/sup 2/4p-italic/sup 3/4f-italic and 4s-italic4p-italic/sup 4/4d-italic configurations. From the optimized energy-level values, a system of Ritz-type wavelength standards with accuracies varying from 0.0003 to 0.003 A-circle in the range 179--500 A-circle has been determined. The ionization energy as determined from 4s-italic/sup 2/4p-italic/sup 3/n-italics-italic levels (n-italic = 5-7) is 737 110 +- 200 cm/sup -1/ (91.390 +- 0.025 eV).
- Research Organization:
- National Bureau of Standards, Gaithersburg, Maryland 20899
- OSTI ID:
- 5571773
- Journal Information:
- J. Opt. Soc. Am. B: Opt. Phys.; (United States), Journal Name: J. Opt. Soc. Am. B: Opt. Phys.; (United States) Vol. 3:7; ISSN JOBPD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
BENCHMARKS
CHARGED PARTICLES
COUPLING
DATA
ELECTRIC DISCHARGES
ELECTRONIC STRUCTURE
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
EXPERIMENTAL DATA
HARTREE-FOCK METHOD
INFORMATION
INTERMEDIATE COUPLING
IONIZATION POTENTIAL
IONS
L-S COUPLING
NATIONAL ORGANIZATIONS
NUMERICAL DATA
SPECTRA
ULTRAVIOLET SPECTRA
US DOC
US NBS
US ORGANIZATIONS
YTTRIUM IONS