Open AccessEnergy Levels of Singly Ionized and Neutral Hafnium
Author(s) -
J. E. Lawler,
J. R. Schmidt,
E. A. Den Hartog
Publication year - 2022
Publication title -
the astrophysical journal supplement series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.546
H-Index - 277
eISSN - 1538-4365
pISSN - 0067-0049
DOI - 10.3847/1538-4365/ac36d7
Subject(s) - physics , ionization , spectrometer , spectral line , interferometry , hafnium , range (aeronautics) , energy (signal processing) , atomic physics , computational physics , optics , ion , astronomy , chemistry , materials science , zirconium , inorganic chemistry , quantum mechanics , composite material
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.
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