Vacuum Ultraviolet Fourier-transform Spectroscopy of <sup>16</sup>O and <sup>18</sup>O
Publication Date
2022-06-01Journal Title
The Astrophysical Journal Supplement Series
ISSN
0067-0049
Publisher
American Astronomical Society
Volume
260
Issue
2
Language
en
Type
Article
This Version
VoR
Metadata
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Lai, K., Manalili, D., Ubachs, W., Cooke, R., Pettini, M., de Oliveira, N., & Salumbides, E. (2022). Vacuum Ultraviolet Fourier-transform Spectroscopy of <sup>16</sup>O and <sup>18</sup>O. The Astrophysical Journal Supplement Series, 260 (2) https://doi.org/10.3847/1538-4365/ac6350
Abstract
<jats:title>Abstract</jats:title>
<jats:p>A spectroscopic study of atomic oxygen (O <jats:sc>i</jats:sc>) is performed using the Fourier-transform vacuum ultraviolet (VUV) spectrometer at the Dichroïsme Et Spectroscopie par Interaction avec le Rayonnement Synchrotron beamline of the SOLEIL synchrotron. Transition frequencies of O <jats:sc>i</jats:sc> lines in the range between 76,000 and 151,000 cm<jats:sup>−1</jats:sup>, corresponding to wavelengths between 665 and 1306 Å, are presented. In the wavelength window a data set of 208 lines is obtained for which line centers were determined at an accuracy of ≤0.035 cm<jats:sup>−1</jats:sup>, verified through a comparison with previous VUV-laser spectroscopy at an accuracy of 0.008 cm<jats:sup>−1</jats:sup>. Transitions to upper states belonging to several <jats:italic>ns</jats:italic> and <jats:italic>nd</jats:italic> Rydberg series that converge to the <jats:sup>4</jats:sup>S<jats:sub>3/2</jats:sub>, <jats:sup>2</jats:sup>D, and <jats:sup>2</jats:sup>P ionization limits are presented. Besides studies on the main <jats:sup>16</jats:sup>O isotope, measurements of the <jats:sup>18</jats:sup>O isotope are also performed, for which an enriched sample of <jats:sup>18</jats:sup>O<jats:sub>2</jats:sub> gas is used. A least-squares optimization analysis is performed after merging the present new data set with some relevant accurate literature data to extract a list of level energies at high accuracy. When comparing with the database of the National Institute of Standards and Technology, good agreement is found for levels with low principal quantum numbers <jats:italic>n</jats:italic> ≤ 7 or below excitation energies of 108,000 cm<jats:sup>−1</jats:sup>; however, significant deviations were found for levels with <jats:italic>n</jats:italic> > 7. The main result of the present study is the realization of an improved data set of transition frequencies and level energies for O <jats:sc>i</jats:sc>, with its usefulness demonstrated in a comparison with high-resolution astronomical spectra showing absorption in the line of sight to distant quasars.</jats:p>
Keywords
370, Laboratory Astrophysics, Instrumentation, Software, and Data
Sponsorship
Royal Society University Fellowship (UF150281)
UKRI ∣ Science and Technology Facilities Council (STFC) (ST/T000244/1)
Identifiers
apjsac6350, ac6350, aas36845
External DOI: https://doi.org/10.3847/1538-4365/ac6350
This record's URL: https://www.repository.cam.ac.uk/handle/1810/338195
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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