Soft X-ray Induced Production of Neutral Fragments in High-Rydberg States at the O 1s Ionization Threshold of the Water Molecule

Antti Kivimaki; Tomasz Wąsowicz; Robert Richter

doi:10.1021/acs.jpca.0c06940

Soft X-ray Induced Production of Neutral Fragments in High-Rydberg States at the O 1s Ionization Threshold of the Water Molecule

Abstract

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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Authors (3)

Antti Kivimaki
- Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland
Tomasz Wąsowicz (formerly: Tomasz J. Wąsowicz) dr hab.
Robert Richter
- Elettra Sincrotrone Trieste, Area Science Park Basovizza, 34149 Trieste, Italy

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Category:: Articles
Type:: artykuły w czasopismach
Published in:: JOURNAL OF PHYSICAL CHEMISTRY A no. 125, pages 713 - 720,
ISSN: 1089-5639
Language:: English
Publication year:: 2021
Bibliographic description:: Kivimaki A., Wąsowicz T. J., Richter R.: Soft X-ray Induced Production of Neutral Fragments in High-Rydberg States at the O 1s Ionization Threshold of the Water Molecule// JOURNAL OF PHYSICAL CHEMISTRY A -Vol. 125,iss. 3 (2021), s.713-720
DOI:: Digital Object Identifier (open in new tab) 10.1021/acs.jpca.0c06940
Verified by:: Gdańsk University of Technology