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Photoionization Cross-Sections of Carbon-Like N+ Near the K-Edge (390–440 eV)

National Centre for Plasma Science and Technology (NCPST), School of Physical Sciences, Dublin City University, Dublin 9, Ireland
Institut des Sciences Moléculaires d’Orsay, UMR 8214, Rue André Rivière, Bâtiment 520, Université Paris-Saclay, F-91405 Orsay, France
Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, CEDEX, F-91192 Gif-sur-Yvette, France
CEA, DAM, DIF, F-91297 Arpajon, France
Commissariat à l’Énergie Atomique et aux Énergies Alternatives, Laboratoire Matière en Conditions Extrêmes, Université Paris-Saclay, 91680 Bruyères le Châtel, France
Centre for Theoretical Atomic, Molecular and Optical Physics (CTAMOP), School of Mathematics and Physics, The David Bates Building, 7 College Park, Queen’s University Belfast, Belfast BT7 1NN, UK
Author to whom correspondence should be addressed.
Academic Editor: Luca Argenti
Atoms 2021, 9(2), 27;
Received: 2 April 2021 / Revised: 4 May 2021 / Accepted: 6 May 2021 / Published: 11 May 2021
(This article belongs to the Special Issue Interaction of Ionizing Photons with Atomic and Molecular Ions)
High-resolution K-shell photoionization cross-sections for the C-like atomic nitrogen ion (N+) are reported in the 398 eV (31.15 Å) to 450 eV (27.55 Å) energy (wavelength) range. The results were obtained from absolute ion-yield measurements using the SOLEIL synchrotron radiation facility for spectral bandpasses of 65 meV or 250 meV. In the photon energy region 398–403 eV, 1s2p autoionizing resonance states dominated the cross section spectrum. Analyses of the experimental profiles yielded resonance strengths and Auger widths. In the 415–440 eV photon region 1s(1s2s22p2 4P)np and 1s(1s2s22p2 2P)np resonances forming well-developed Rydberg series up n=7 and n=8 , respectively, were identified in both the single and double ionization spectra. Theoretical photoionization cross-section calculations, performed using the R-matrix plus pseudo-states (RMPS) method and the multiconfiguration Dirac-Fock (MCDF) approach were bench marked against these high-resolution experimental results. Comparison of the state-of-the-art theoretical work with the experimental studies allowed the identification of new resonance features. Resonance strengths, energies and Auger widths (where available) are compared quantitatively with the theoretical values. Contributions from excited metastable states of the N+ ions were carefully considered throughout. View Full-Text
Keywords: atomic data; inner-shell photoionization; atomic nitrogen ion atomic data; inner-shell photoionization; atomic nitrogen ion
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MDPI and ACS Style

Mosnier, J.-P.; Kennedy, E.T.; Bizau, J.-M.; Cubaynes, D.; Guilbaud, S.; Blancard, C.; McLaughlin, B.M. Photoionization Cross-Sections of Carbon-Like N+ Near the K-Edge (390–440 eV). Atoms 2021, 9, 27.

AMA Style

Mosnier J-P, Kennedy ET, Bizau J-M, Cubaynes D, Guilbaud S, Blancard C, McLaughlin BM. Photoionization Cross-Sections of Carbon-Like N+ Near the K-Edge (390–440 eV). Atoms. 2021; 9(2):27.

Chicago/Turabian Style

Mosnier, Jean-Paul, Eugene T. Kennedy, Jean-Marc Bizau, Denis Cubaynes, Ségolène Guilbaud, Christophe Blancard, and Brendan M. McLaughlin. 2021. "Photoionization Cross-Sections of Carbon-Like N+ Near the K-Edge (390–440 eV)" Atoms 9, no. 2: 27.

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