{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,8]],"date-time":"2026-06-08T11:25:53Z","timestamp":1780917953624,"version":"3.54.1"},"reference-count":38,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2023,7,5]],"date-time":"2023-07-05T00:00:00Z","timestamp":1688515200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Italian MIUR"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>The behavior of nitrosyl chloride (ClNO) exposed to ionizing radiation was studied by direct probing valence-shell electrons in temporal coincidence with ions originating from the fragmentation process of the transient ClNO2+. Such a molecular dication was produced by double photoionization with synchrotron radiation in the 24\u201370 eV photon energy range. The experiment has been conducted at the Elettra Synchrotron Facility of Basovizza (Trieste, Italy) using a light beam linearly polarized with the direction of the polarization vector parallel to the ClNO molecular beam axis. ClNO molecules crossing the photon beam at right angles in the scattering region are generated by effusive expansion and randomly oriented. The threshold energy for the double ionization of ClNO (30.1 \u00b1 0.1 eV) and six dissociation channels producing NO+\/Cl+, N+\/Cl+, N+\/O+, O+\/Cl+, ClN+\/O+, NO+\/Cl2+ ion pairs, with their relative abundance and threshold energies, have been measured.<\/jats:p>","DOI":"10.3390\/molecules28135218","type":"journal-article","created":{"date-parts":[[2023,7,6]],"date-time":"2023-07-06T00:54:41Z","timestamp":1688604881000},"page":"5218","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Double Photoionization of Nitrosyl Chloride by Synchrotron Radiation in the 24\u201370 eV Photon Energy Range"],"prefix":"10.3390","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8101-4022","authenticated-orcid":false,"given":"Luca","family":"Schio","sequence":"first","affiliation":[{"name":"IOM CNR Laboratorio TASC, 34012 Trieste, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8467-1842","authenticated-orcid":false,"given":"Michele","family":"Alagia","sequence":"additional","affiliation":[{"name":"IOM CNR Laboratorio TASC, 34012 Trieste, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert","family":"Richter","sequence":"additional","affiliation":[{"name":"Sincrotrone Trieste, Area Science Park, 34149 Trieste, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vitali","family":"Zhaunerchyk","sequence":"additional","affiliation":[{"name":"Department of Physics, University of Gothenburg, 412 96 Gothenburg, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9057-5072","authenticated-orcid":false,"given":"Stefano","family":"Stranges","sequence":"additional","affiliation":[{"name":"IOM CNR Laboratorio TASC, 34012 Trieste, Italy"},{"name":"Department of Chemistry and Drug Technology, University of Rome Sapienza, 00185 Rome, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3110-6521","authenticated-orcid":false,"given":"Fernando","family":"Pirani","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy"},{"name":"Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7855-9969","authenticated-orcid":false,"given":"Franco","family":"Vecchiocattivi","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6082-2116","authenticated-orcid":false,"given":"Marco","family":"Parriani","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5301-6730","authenticated-orcid":false,"given":"Stefano","family":"Falcinelli","sequence":"additional","affiliation":[{"name":"Department of Civil and Environmental Engineering, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,7,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"810","DOI":"10.1038\/249810a0","article-title":"Stratospheric Sink for Chlorofluoromethanes: Chlorine Atom-Catalysed Destruction of Ozone","volume":"249","author":"Molina","year":"1974","journal-title":"Nature"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"676","DOI":"10.1038\/306676a0","article-title":"Reaction of NO2 with NaCl and Atmospheric Implications of NOCl Formation","volume":"306","year":"1983","journal-title":"Nature"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"4801","DOI":"10.1021\/cr020653t","article-title":"The Tropospheric Chemistry of Sea Salt: A Molecular-Level View of the Chemistry of NaCl and NaBr","volume":"103","year":"2003","journal-title":"Chem. Rev."},{"key":"ref_4","first-page":"432","article-title":"The Absorption Spectrum of Nitrosyl Chloride","volume":"172","author":"Goodeve","year":"1939","journal-title":"Proc. R. Soc. Lond. Ser. A Math. Phys. Sci."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"3903","DOI":"10.1063\/1.455801","article-title":"The Electronic Spectrum of NOCl: Photofragment Spectroscopy, Vector Correlations, and ab initio Calculations","volume":"90","author":"Bai","year":"1989","journal-title":"J. Chem. Phys."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1098","DOI":"10.1063\/1.459173","article-title":"Photodissociation of ClNO in the S1 State: A Quantum-Mechanical ab initio Study","volume":"93","author":"Schinke","year":"1990","journal-title":"J. Chem. Phys."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"6763","DOI":"10.1021\/j100171a007","article-title":"Spectroscopy and Dynamics of Fast Evolving States","volume":"95","author":"Qian","year":"1991","journal-title":"J. Phys. Chem."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"3688","DOI":"10.1063\/1.461922","article-title":"Mapping of Transition-State Wave Functions. II. A Model for the Photodissociation of ClNO(T1)","volume":"96","author":"Vegiri","year":"1992","journal-title":"J. Chem. Phys."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"12321","DOI":"10.1021\/jp9535708","article-title":"Photofragmentation of ClNO in the A-Band: Velocity Distribution and Fine-Structure Branching Ratio of Cl(2Pj) Atoms","volume":"100","author":"Skorokhodov","year":"1996","journal-title":"J. Phys. Chem."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1265","DOI":"10.1039\/a806792i","article-title":"Quantum Mechanical Study of Photodissociation of Oriented ClNO(S1)","volume":"1","author":"Guo","year":"1999","journal-title":"Phys. Chem. Chem. Phys."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/S0301-0104(00)00177-4","article-title":"Calculation of the Electronic and Photoelectronic Spectra of Nitroso Compounds: A Reinvestigation by Use of Configuration Interaction Methods","volume":"258","author":"Lacombe","year":"2000","journal-title":"Chem. Phys."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"6631","DOI":"10.1063\/1.1355656","article-title":"Resonance Raman Spectroscopy in the Dissociative A band of Nitrosyl Chloride","volume":"114","author":"Mackey","year":"2001","journal-title":"J. Chem. Phys."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"2105","DOI":"10.1063\/1.1768158","article-title":"Excited State Electronic Structures and Dynamics of NOCl: A New Potential Function Set, Absorption Spectrum, and Photodissociation Mechanism","volume":"121","author":"Yamashita","year":"2004","journal-title":"J. Chem. Phys."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1479","DOI":"10.1002\/cphc.201200999","article-title":"Photodissociation of ClNO in the 21A\u2032 State: Computational and Experimental NO Product State Distributions","volume":"14","author":"Jones","year":"2013","journal-title":"ChemPhysChem"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1016\/0301-0104(88)87218-5","article-title":"Photofragmentation LIF Spectroscopy of NOCl at Dissociation Wavelengths > 450 nm. Parent Electronic Spectrum and Spin State and \u039b-Doublet Populations of Nascent NO and Cl fragments","volume":"120","author":"Bruno","year":"1988","journal-title":"Chem. Phys."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"3886","DOI":"10.1021\/jp8100283","article-title":"Femtosecond TRIR Studies of ClNO Photochemistry in Solution: Evidence for Photoisomerization and Geminate Recombination","volume":"113","author":"Bixby","year":"2009","journal-title":"J. Phys. Chem. A"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"10437","DOI":"10.1021\/jp211697r","article-title":"Time-Resolved Infrared Absorption Studies of the Solvent-Dependent Photochemistry of ClNO","volume":"116","author":"Patterson","year":"2012","journal-title":"J. Phys. Chem. B"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Falcinelli, S., and Rosi, M. (2020). Production and Characterization of Molecular Dications: Experimental and Theoretical Efforts. Molecules, 25.","DOI":"10.3390\/molecules25184157"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1511","DOI":"10.1063\/1.454129","article-title":"Electronic States and Decay Mechanisms of the N2O2+ Dication","volume":"88","author":"Price","year":"1988","journal-title":"J. Chem. Phys."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"6590","DOI":"10.1063\/1.465851","article-title":"Dissociations of the Ethyne Dication C2H2+2","volume":"99","author":"Thissen","year":"1993","journal-title":"J. Chem. Phys."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"084317","DOI":"10.1063\/1.1850895","article-title":"Spectroscopy and Metastability of CO22+ Molecular Ions","volume":"122","author":"Slattery","year":"2005","journal-title":"J. Chem. Phys."},{"key":"ref_22","first-page":"103","article-title":"Dynamics of Double Photoionization in Molecules and Atoms","volume":"Volume 141","author":"Rice","year":"2009","journal-title":"Advances in Chemical Physics"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"299","DOI":"10.1080\/01442359609353186","article-title":"Dynamics of Charge Transfer and Chemical Reactions of Doubly-Charged Ions at Low Collision Energies","volume":"15","author":"Herman","year":"1996","journal-title":"Int. Rev. Phys. Chem."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"871","DOI":"10.1007\/s13738-013-0359-5","article-title":"Diatomic Dications and Dianions","volume":"11","author":"Sabzyan","year":"2013","journal-title":"J. Iran. Chem. Soc."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"145","DOI":"10.1080\/0144235X.2017.1283844","article-title":"Bimolecular Reactions of the Dications and Trications of Atoms and Small Molecules in the Gas-Phase","volume":"36","author":"Price","year":"2017","journal-title":"Int. Rev. Phys. Chem."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"9040","DOI":"10.1039\/C4CP05896H","article-title":"NEXAFS and XPS Studies of Nitrosyl Chloride","volume":"17","author":"Schio","year":"2015","journal-title":"Phys. Chem. Chem. Phys."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"164305","DOI":"10.1063\/1.5047262","article-title":"Investigating Core-Excited States of Nitrosyl Chloride (ClNO) and Their Break-Up Dynamics Following Auger Decay","volume":"149","author":"Schio","year":"2018","journal-title":"J. Chem. Phys."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"124306","DOI":"10.1063\/5.0106642","article-title":"Electronic State Influence on Selective Bond Breaking of Core-Excited Nitrosyl Chloride (ClNO)","volume":"157","author":"Schio","year":"2022","journal-title":"J. Chem. Phys."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"817","DOI":"10.1103\/PhysRev.90.817","article-title":"The Threshold Law for Single Ionization of Atoms or Ions by Electrons","volume":"90","author":"Wannier","year":"1953","journal-title":"Phys. Rev."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"10508","DOI":"10.1063\/1.1809116","article-title":"The Double Photoionization of HCl: An Ion\u2013Electron Coincidence Study","volume":"121","author":"Alagia","year":"2004","journal-title":"J. Chem. Phys."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"6980","DOI":"10.1063\/1.1669382","article-title":"Threshold-Photoelectron-Spectroscopy-Coincidence Study of the Double Photoionization of HBr","volume":"120","author":"Alagia","year":"2004","journal-title":"J. Chem. Phys."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"144304","DOI":"10.1063\/1.3646516","article-title":"Dissociative Double Photoionization of Singly Deuterated Benzene Molecules in the 26\u201333 eV Energy Range","volume":"135","author":"Alagia","year":"2011","journal-title":"J. Chem. Phys."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"867","DOI":"10.1002\/cjoc.200690165","article-title":"Ionization and Dissociation of Nitrosyl Chloride Molecule in the Intense Femtosecond Laser Field","volume":"24","author":"Yao","year":"2006","journal-title":"Chin. J. Chem."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"1250065","DOI":"10.1142\/S0217984912500650","article-title":"Electron Impact Dissociative Ionization of Nitrosyl Chloride","volume":"26","author":"Wang","year":"2012","journal-title":"Mod. Phys. Lett. B."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"814","DOI":"10.1039\/f29767200814","article-title":"Photoelectron Spectrum of Nitrosyl Chloride","volume":"72","author":"Abbas","year":"1976","journal-title":"J. Chem. Soc. Faraday Trans. 2"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"1310","DOI":"10.1039\/C2CP43466K","article-title":"The Soft X-Ray Absorption Spectrum of the Allyl Free Radical","volume":"15","author":"Alagia","year":"2013","journal-title":"Phys. Chem. Chem. Phys."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"2968","DOI":"10.1063\/1.1149855","article-title":"A New Detector for Measuring Three-Dimensional Momenta of Charged Particles in Coincidence","volume":"70","year":"1999","journal-title":"Rev. Sci. Instrum."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"1718","DOI":"10.1063\/1.1145828","article-title":"High Flux and High Resolution Beamline for Elliptically Polarized Radiation in the Vacuum Ultraviolet and Soft X-ray Regions","volume":"66","author":"Derossi","year":"1995","journal-title":"Rev. Sci. Instrum."}],"container-title":["Molecules"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1420-3049\/28\/13\/5218\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T20:06:30Z","timestamp":1760126790000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1420-3049\/28\/13\/5218"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,7,5]]},"references-count":38,"journal-issue":{"issue":"13","published-online":{"date-parts":[[2023,7]]}},"alternative-id":["molecules28135218"],"URL":"https:\/\/doi.org\/10.3390\/molecules28135218","relation":{},"ISSN":["1420-3049"],"issn-type":[{"value":"1420-3049","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,7,5]]}}}