University of Oulu

Kivimäki, A., Wasowicz, T. J., & Richter, R. (2021). Soft X-ray Induced Production of Neutral Fragments in High-Rydberg States at the O 1s Ionization Threshold of the Water Molecule. The Journal of Physical Chemistry A, 125(3), 713–720.

Soft X-ray induced production of neutral fragments in high-Rydberg states at the O 1s ionization threshold of the water molecule

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Author: Kivimäki, Antti1,2; Wasowicz, Tomasz J.3; Richter, Robert4
Organizations: 1Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland
2MAX IV Laboratory, Lund University, P.O. Box 118, 22100 Lund, Sweden
3Division of Complex Systems Spectroscopy, Institute of Physics and Computer Science, Gdañsk University of Technology, ul. G. Narutowicza 11/12, 80-233 Gdañsk, Poland
4Elettra Sincrotrone Trieste, Area Science Park Basovizza, 34149 Trieste, Italy
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
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Language: English
Published: American Chemical Society, 2021
Publish Date: 2021-03-11


Dissociation of water molecules after soft X-ray absorption can yield neutral fragments in high-Rydberg (HR) states. We have studied the production of such fragments by field ionization and ion time-of-flight (TOF) spectrometry. Neutral HR fragments are created at all resonances below the O 1s ionization potential (IP) and particularly within 1 eV above the O 1s IP. The latter effect is due to the recapture of the O 1s photoelectrons into HR orbitals of the molecular water ion after the emission of a fast Auger electron. H₂O+(HR) fragments subsequently dissociate, yielding neutral H(HR) and O(HR) fragments, as were found by measuring the TOF spectra by pulsed field ionization. Such measurements were carried out at the O 1s → 4a₁ and 2b₂ resonances as well as just above the O 1s IP. The TOF spectra also reveal two series of oscillatory structures that are attributed to quantum beats involving Lyman emission in one of the series and field ionization of H(HR) fragments in the other series.

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Series: The journal of physical chemistry. A
ISSN: 1089-5639
ISSN-E: 1520-5215
ISSN-L: 1089-5639
Volume: 125
Issue: 3
Pages: 713 - 720
DOI: 10.1021/acs.jpca.0c06940
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: The stay of T.J.W. at Elettra was financially supported by COST Action CM1204 XLIC (COST-STSM-CM1204-32611).
Copyright information: © 2021 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.