{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,25]],"date-time":"2026-03-25T11:58:23Z","timestamp":1774439903708,"version":"3.50.1"},"reference-count":25,"publisher":"Wiley","issue":"19","license":[{"start":{"date-parts":[[2001,9,5]],"date-time":"2001-09-05T00:00:00Z","timestamp":999648000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Rapid Comm Mass Spectrometry"],"published-print":{"date-parts":[[2001,10,15]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    A series of halogenated anthraquinone (AQ) derivatives has been studied by means of electron capture negative ion (NI) mass spectrometry (ECNI\u2010MS). 1Cl\u2010AQ and 2Br\u2010AQ display dramatically steep positive temperature dependencies of Hal\n                    <jats:sup>\u2212<\/jats:sup>\n                    ion abundance in the low electron energy region. Molecular NI intensity decreases rapidly with increasing temperature in the case of 1I\u2010AQ. In the case of 2Br\u2010AQ, a metastable NI peak (\n                    <jats:italic>m<\/jats:italic>\n                    \/\n                    <jats:italic>z<\/jats:italic>\n                    22.9) corresponding to the process BrAQ\n                    <jats:sup>\u2212<\/jats:sup>\n                    \u2192 Br\n                    <jats:sup>\u2212<\/jats:sup>\n                    \u2005+\u2005AQ\n                    <jats:sup>0<\/jats:sup>\n                    was recorded. This means that the characteristic dissociation lifetime of the molecular NI Br\u2010AQ\n                    <jats:sup>\u2212<\/jats:sup>\n                    is at least \u223c25\u2005\u00b5s at the energy \u223c0.67\u2005eV in the low\u2010temperature spectrum (\n                    <jats:italic>T<\/jats:italic>\n                    \u223c80\u2009\u00b0C), and at the energy \u223c0.13\u2005eV in the hot spectrum (\n                    <jats:italic>T<\/jats:italic>\n                    \u223c290\u2009\u00b0C). Together with the observed temperature dependence of the 2Br\u2010AQ curves of effective yield (CEY), this proves that this anion dissociates according to Coulson's model. The same halogen anion behavior is observed in the case of 1Cl\u2010AQ. There are three consecutive stages in the process of molecular NI dissociation of Cl\u2010 and Br\u2010substituted AQ, namely, electron capture into the empty \u03c0\u2010orbital by means of the shape resonance mechanism, followed by a radiationless transition into the ground electronic \u03c0\u2010state of the anion, as predicted by Compton in the case of the parabenzoquinone molecule, and, finally, a fluctuative dissociation of the molecular NI accompanied by the transition from the \u03c0\u2010term into the \u03c3\u2010term, so\u2010called predissociation. Calculations show reasonable agreement with the experimental data. In the case of 1I\u2010AQ, an effect of inversion of empty levels in the process of electron capture by the molecule takes place, a violation of the so\u2010called frozen shell approximation. The phenomenon found may be of significance not only in the case of ECNI\u2010MS, but also in other experimental investigations using low\u2010energy electron\u2010molecule and ion\u2010molecule collisions. Copyright \u00a9 2001 John Wiley &amp; Sons, Ltd.\n                  <\/jats:p>","DOI":"10.1002\/rcm.446","type":"journal-article","created":{"date-parts":[[2002,8,25]],"date-time":"2002-08-25T17:23:24Z","timestamp":1030296204000},"page":"1869-1878","source":"Crossref","is-referenced-by-count":12,"title":["Violation of frozen shell approximation in dissociative electron capture by halogenated anthraquinones"],"prefix":"10.1002","volume":"15","author":[{"given":"N. L.","family":"Asfandiarov","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"V. S.","family":"Fal'ko","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"V. 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