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Vacuum Ultraviolet Fourier-transform Spectroscopy of 16O and 18O

Lai, K.-F.; Manalili, D.; Ubachs, W.; Cooke, R.; Pettini, M.; de Oliveira, N.; Salumbides, E.J.

Vacuum Ultraviolet Fourier-transform Spectroscopy of 16O and 18O Thumbnail


K.-F. Lai

D. Manalili

W. Ubachs

M. Pettini

N. de Oliveira

E.J. Salumbides


A spectroscopic study of atomic oxygen (O I) 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 I lines in the range between 76,000 and 151,000 cm−1 , 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−1 , verified through a comparison with previous VUV-laser spectroscopy at an accuracy of 0.008 cm−1 . Transitions to upper states belonging to several ns and nd Rydberg series that converge to the 4 S3/2, 2 D, and 2 P ionization limits are presented. Besides studies on the main 16O isotope, measurements of the 18O isotope are also performed, for which an enriched sample of 18O2 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 n „ 7 or below excitation energies of 108,000 cm−1 ; however, significant deviations were found for levels with n > 7. The main result of the present study is the realization of an improved data set of transition frequencies and level energies for O I, with its usefulness demonstrated in a comparison with high-resolution astronomical spectra showing absorption in the line of sight to distant quasars.


Lai, K., Manalili, D., Ubachs, W., Cooke, R., Pettini, M., de Oliveira, N., & Salumbides, E. (2022). Vacuum Ultraviolet Fourier-transform Spectroscopy of 16O and 18O. Astrophysical Journal Supplement, 260(2), Article 37.

Journal Article Type Article
Acceptance Date Mar 21, 2022
Online Publication Date Jun 17, 2022
Publication Date 2022-06
Deposit Date Jul 12, 2022
Publicly Available Date Jul 12, 2022
Journal The Astrophysical Journal Supplement Series
Print ISSN 0067-0049
Electronic ISSN 1538-4365
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 260
Issue 2
Article Number 37


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