Disentangling Auger decays in O2 by photoelectron-ion coincidences

Abstract In non-resonant Auger electron spectroscopies, multi core-ionized states lead to numerous energetically close-lying electronic transitions in Auger spectra, this hampering the assignment and interpretation of the experimental results. Here we reveal a new method to overcome this intrinsic l...

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Autores principales:	Xiao-Jing Liu, Christophe Nicolas, Minna Patanen, Catalin Miron
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/ed43509ecba84102b9bb4c56880205f6
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spelling	oai:doaj.org-article:ed43509ecba84102b9bb4c56880205f62021-12-02T12:32:51ZDisentangling Auger decays in O2 by photoelectron-ion coincidences10.1038/s41598-017-02875-x2045-2322https://doaj.org/article/ed43509ecba84102b9bb4c56880205f62017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02875-xhttps://doaj.org/toc/2045-2322Abstract In non-resonant Auger electron spectroscopies, multi core-ionized states lead to numerous energetically close-lying electronic transitions in Auger spectra, this hampering the assignment and interpretation of the experimental results. Here we reveal a new method to overcome this intrinsic limitation of non-resonant inner-shell spectroscopies. In a proof-of-principle experiment performed for the O2 molecule, most of the Auger final states are dissociative, and we measure in coincidence the kinetic energy of the photoelectron and the kinetic energy release of the (O+, O+) ion pairs produced after the Auger decay of the O 1s−1 core-ionized states. The Auger final states are assigned using energy conservation. We fully separate the contributions from the 4Σ− and 2Σ− intermediate ionic states and conclusively demonstrate that the Auger decay probability can dramatically depend on the different O2 1s −1 intermediate multiplet states. In addition, a metastable Auger final state also exists, with lifetime longer than 3.8 μs, and clear changes are observed in both branching ratio and spectral profile of the O 1s photoelectron spectrum when they are recorded in coincidence with either $${{\bf{O}}}_{{\bf{2}}}^{{\boldsymbol{+}}{\boldsymbol{+}}}$$ O 2 + + or with other ionic species. These changes are attributed to the population of the metastable $${{\boldsymbol{B}}}^{{\boldsymbol{^{\prime} }}3}{{\boldsymbol{\Sigma }}}_{{\boldsymbol{u}}}^{-}({\boldsymbol{\nu }}{\boldsymbol{^{\prime\prime} }}{\boldsymbol{=}}0)$$ B ′ 3 Σ u − ( ν ″ = 0 ) Auger final state via different intermediate states.Xiao-Jing LiuChristophe NicolasMinna PatanenCatalin MironNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xiao-Jing Liu Christophe Nicolas Minna Patanen Catalin Miron Disentangling Auger decays in O2 by photoelectron-ion coincidences
description	Abstract In non-resonant Auger electron spectroscopies, multi core-ionized states lead to numerous energetically close-lying electronic transitions in Auger spectra, this hampering the assignment and interpretation of the experimental results. Here we reveal a new method to overcome this intrinsic limitation of non-resonant inner-shell spectroscopies. In a proof-of-principle experiment performed for the O2 molecule, most of the Auger final states are dissociative, and we measure in coincidence the kinetic energy of the photoelectron and the kinetic energy release of the (O+, O+) ion pairs produced after the Auger decay of the O 1s−1 core-ionized states. The Auger final states are assigned using energy conservation. We fully separate the contributions from the 4Σ− and 2Σ− intermediate ionic states and conclusively demonstrate that the Auger decay probability can dramatically depend on the different O2 1s −1 intermediate multiplet states. In addition, a metastable Auger final state also exists, with lifetime longer than 3.8 μs, and clear changes are observed in both branching ratio and spectral profile of the O 1s photoelectron spectrum when they are recorded in coincidence with either $${{\bf{O}}}_{{\bf{2}}}^{{\boldsymbol{+}}{\boldsymbol{+}}}$$ O 2 + + or with other ionic species. These changes are attributed to the population of the metastable $${{\boldsymbol{B}}}^{{\boldsymbol{^{\prime} }}3}{{\boldsymbol{\Sigma }}}_{{\boldsymbol{u}}}^{-}({\boldsymbol{\nu }}{\boldsymbol{^{\prime\prime} }}{\boldsymbol{=}}0)$$ B ′ 3 Σ u − ( ν ″ = 0 ) Auger final state via different intermediate states.
format	article
author	Xiao-Jing Liu Christophe Nicolas Minna Patanen Catalin Miron
author_facet	Xiao-Jing Liu Christophe Nicolas Minna Patanen Catalin Miron
author_sort	Xiao-Jing Liu
title	Disentangling Auger decays in O2 by photoelectron-ion coincidences
title_short	Disentangling Auger decays in O2 by photoelectron-ion coincidences
title_full	Disentangling Auger decays in O2 by photoelectron-ion coincidences
title_fullStr	Disentangling Auger decays in O2 by photoelectron-ion coincidences
title_full_unstemmed	Disentangling Auger decays in O2 by photoelectron-ion coincidences
title_sort	disentangling auger decays in o2 by photoelectron-ion coincidences
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/ed43509ecba84102b9bb4c56880205f6
work_keys_str_mv	AT xiaojingliu disentanglingaugerdecaysino2byphotoelectronioncoincidences AT christophenicolas disentanglingaugerdecaysino2byphotoelectronioncoincidences AT minnapatanen disentanglingaugerdecaysino2byphotoelectronioncoincidences AT catalinmiron disentanglingaugerdecaysino2byphotoelectronioncoincidences
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Disentangling Auger decays in O2 by photoelectron-ion coincidences

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