Energy Levels of Singly Ionized and Neutral Hafnium

Improved energy levels for singly ionized and neutral hafnium of both even and odd parity are determined from Fourier transform spectrometer data using a least-squares optimization procedure. Data from interferometric spectrometers provide much tighter control of systematic uncertainties of line pos...

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Bibliographic Details
Published in:The Astrophysical journal. Supplement series 2022-02, Vol.258 (2), p.27
Main Authors: Lawler, J. E., Schmidt, J. R., Den Hartog, E. A.
Format: Article
Language:English
Subjects:
Atomic spectroscopy
Energy levels
Fourier transform spectrometers
Fourier transforms
Hafnium
Laboratory astrophysics
Line positions
Optimization
Position measurement
Spectrometers
Systematic errors
Uncertainty
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Summary:Improved energy levels for singly ionized and neutral hafnium of both even and odd parity are determined from Fourier transform spectrometer data using a least-squares optimization procedure. Data from interferometric spectrometers provide much tighter control of systematic uncertainties of line position measurements than can be achieved using dispersive spectrometers. The strong optical and near-UV lines connecting these levels are most likely to be used in the determination of isotopic abundance patterns. Comparisons of new results to published ones strongly suggest that our energy levels have systematic uncertainties in the mK (1 mK = 0.001 cm −1 ) range or smaller, and that widely used tables of energy levels for ionized Hf have systematic errors of approximately 70 mK.
ISSN:0067-0049
1538-4365
DOI:10.3847/1538-4365/ac36d7