Direct experimental observation of weakly-bound character of the attached electron in europium anion
Identifieur interne : 000A34 ( Ncbi/Checkpoint ); précédent : 000A33; suivant : 000A35Direct experimental observation of weakly-bound character of the attached electron in europium anion
Auteurs : Shi-Bo Cheng [États-Unis] ; A. W. Castleman [États-Unis]Source :
- Scientific Reports [ 2045-2322 ] ; 2015.
Abstract
Direct experimental determination of precise electron affinities (EAs) of lanthanides is a longstanding challenge to experimentalists. Considerable debate exists in previous experiment and theory, hindering the complete understanding about the properties of the atomic anions. Herein, we report the first precise photoelectron imaging spectroscopy of europium (Eu), with the aim of eliminating prior contradictions. The measured EA (0.116 ± 0.013 eV) of Eu is in excellent agreement with recently reported theoretical predictions, providing direct spectroscopic evidence that the additional electron is weakly attached. Additionally, a new experimental strategy is proposed that can significantly increase the yield of the lanthanide anions, opening up the best opportunity to complete the periodic table of the atomic anions. The present findings not only serve to resolve previous discrepancy but also will help in improving the depth and accuracy of our understanding about the fundamental properties of the atomic anions.
Url:
DOI: 10.1038/srep12414
PubMed: 26198741
PubMed Central: 4510523
Affiliations:
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Direct experimental observation of weakly-bound character of the attached electron in
europium anion</title><author><name sortKey="Cheng, Shi Bo" sort="Cheng, Shi Bo" uniqKey="Cheng S" first="Shi-Bo" last="Cheng">Shi-Bo Cheng</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Department of Chemistry, The Pennsylvania State University</institution>, University Park, Pennsylvania 16802,<country>United States</country></nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Castleman, A W" sort="Castleman, A W" uniqKey="Castleman A" first="A. W." last="Castleman">A. W. Castleman</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Department of Chemistry, The Pennsylvania State University</institution>, University Park, Pennsylvania 16802,<country>United States</country></nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation><affiliation wicri:level="1"><nlm:aff id="a2"><institution>Department of Physics, The Pennsylvania State University</institution>, University Park, Pennsylvania 16802,<country>United States</country></nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">26198741</idno><idno type="pmc">4510523</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4510523</idno><idno type="RBID">PMC:4510523</idno><idno type="doi">10.1038/srep12414</idno><date when="2015">2015</date><idno type="wicri:Area/Pmc/Corpus">000088</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000088</idno><idno type="wicri:Area/Pmc/Curation">000088</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Curation">000088</idno><idno type="wicri:Area/Pmc/Checkpoint">000069</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Checkpoint">000069</idno><idno type="wicri:Area/Ncbi/Merge">000A34</idno><idno type="wicri:Area/Ncbi/Curation">000A34</idno><idno type="wicri:Area/Ncbi/Checkpoint">000A34</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Direct experimental observation of weakly-bound character of the attached electron in
europium anion</title><author><name sortKey="Cheng, Shi Bo" sort="Cheng, Shi Bo" uniqKey="Cheng S" first="Shi-Bo" last="Cheng">Shi-Bo Cheng</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Department of Chemistry, The Pennsylvania State University</institution>, University Park, Pennsylvania 16802,<country>United States</country></nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Castleman, A W" sort="Castleman, A W" uniqKey="Castleman A" first="A. W." last="Castleman">A. W. Castleman</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Department of Chemistry, The Pennsylvania State University</institution>, University Park, Pennsylvania 16802,<country>United States</country></nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation><affiliation wicri:level="1"><nlm:aff id="a2"><institution>Department of Physics, The Pennsylvania State University</institution>, University Park, Pennsylvania 16802,<country>United States</country></nlm:aff><country xml:lang="fr">États-Unis</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author></analytic><series><title level="j">Scientific Reports</title><idno type="eISSN">2045-2322</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Direct experimental determination of precise electron affinities (EAs) of lanthanides
is a longstanding challenge to experimentalists. Considerable debate exists in
previous experiment and theory, hindering the complete understanding about the
properties of the atomic anions. Herein, we report the first precise photoelectron
imaging spectroscopy of europium (Eu), with the aim of eliminating prior
contradictions. The measured EA
(0.116 ± 0.013 eV) of Eu is in
excellent agreement with recently reported theoretical predictions, providing direct
spectroscopic evidence that the additional electron is weakly attached.
Additionally, a new experimental strategy is proposed that can significantly
increase the yield of the lanthanide anions, opening up the best opportunity to
complete the periodic table of the atomic anions. The present findings not only
serve to resolve previous discrepancy but also will help in improving the depth and
accuracy of our understanding about the fundamental properties of the atomic
anions.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Drzaic, P S" uniqKey="Drzaic P">P. S. Drzaic</name></author><author><name sortKey="Marks, J" uniqKey="Marks J">J. Marks</name></author><author><name sortKey="Brauman, J X0a I" uniqKey="Brauman J">J.
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Mandelshtam</name></author><author><name sortKey="Reisler, H" uniqKey="Reisler H">H. Reisler</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Garcia, G A" uniqKey="Garcia G">G. A. Garcia</name></author><author><name sortKey="Nahon, L" uniqKey="Nahon L">L. Nahon</name></author><author><name sortKey="Powis, I" uniqKey="Powis I">I. Powis</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Bilodeau, R C" uniqKey="Bilodeau R">R. C. Bilodeau</name></author><author><name sortKey="Haugen, H K" uniqKey="Haugen H">H. K. Haugen</name></author></analytic></biblStruct></listBibl></div1></back></TEI><affiliations><list><country><li>États-Unis</li></country></list><tree><country name="États-Unis"><noRegion><name sortKey="Cheng, Shi Bo" sort="Cheng, Shi Bo" uniqKey="Cheng S" first="Shi-Bo" last="Cheng">Shi-Bo Cheng</name></noRegion><name sortKey="Castleman, A W" sort="Castleman, A W" uniqKey="Castleman A" first="A. W." last="Castleman">A. W. Castleman</name><name sortKey="Castleman, A W" sort="Castleman, A W" uniqKey="Castleman A" first="A. W." last="Castleman">A. W. Castleman</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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