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Low-lying valence excited triplet and singlet states are investigated by quantum chemical ab initio calculations. The Rydberg series converging to the (lowest) ionisation energy limits of XF4 (X = C, Si, Ge) are also identified and classified using the systematic behaviour according to the magnitude of the quantum defects. A generalized oscillator strength analysis is employed to derive oscillator strength f0 value and the apparent Born integral cross sections from the corresponding differential cross sections by using the Vriens formula for the optically allowed transitions. The f0 value is compared with the optical oscillator strength of the photoabsorption, pseudo-photon measurements, and theoretical values. The binary-encounter and f-scaled Born cross sections of the most intense optically allowed transitions have been also derived from the excitation threshold to the high energy region where the Born approximation is valid. Potential energy curves were obtained along the XF3 + F coordinate with two different basis sets to lend support on electron impact dissociation processes yielding radical formation. We found that in CF4, the lowest-lying dissociative character is due to intramolecular conversion from Rydberg 3s to valence character (\u03c3*(C\u2013F)), whereas in SiF4 and GeF4, an antibonding behaviour prevails.<\/jats:p>","DOI":"10.1063\/1.4979299","type":"journal-article","created":{"date-parts":[[2017,4,11]],"date-time":"2017-04-11T15:25:34Z","timestamp":1491924334000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":3,"title":["Experimental scaling of plane-Born cross sections and <i>ab initio<\/i> assignments for electron-impact excitation and dissociation of XF4 (X = C, Si, and Ge) molecules"],"prefix":"10.1063","volume":"146","author":[{"given":"M.","family":"Hoshino","sequence":"first","affiliation":[{"name":"Sophia University 1 Department of Physics, , Tokyo 102-8554, Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8307-5344","authenticated-orcid":false,"given":"D.","family":"Duflot","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Lille 2 UMR 8523 - Physique des Lasers Atomes et Mol\u00e9cules, , F-59000 Lille, France"},{"name":"UMR 8523 3 CNRS, , F-59000 Lille, France"}]},{"given":"P.","family":"Lim\u00e3o-Vieira","sequence":"additional","affiliation":[{"name":"Sophia University 1 Department of Physics, , Tokyo 102-8554, Japan"},{"name":"Universidade NOVA de Lisboa 4 Laborat\u00f3rio de Colis\u00f5es At\u00f3micas e Moleculares, CEFITEC, Departamento de F\u00edsica, Faculdade de Ci\u00eancias e Tecnologia, , 2829-516 Caparica, Portugal"}]},{"given":"S.","family":"Ohtomi","sequence":"additional","affiliation":[{"name":"Sophia University 1 Department of Physics, , Tokyo 102-8554, Japan"}]},{"given":"H.","family":"Tanaka","sequence":"additional","affiliation":[{"name":"Sophia University 1 Department of Physics, , Tokyo 102-8554, Japan"}]}],"member":"317","published-online":{"date-parts":[[2017,4,11]]},"reference":[{"key":"2023062600350163400_c1","doi-asserted-by":"publisher","first-page":"1607","DOI":"10.1088\/0953-4075\/25\/7\/029","volume":"25","year":"1992","journal-title":"J. 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