Title Positive ions of $SiH_{4}$ : Jahn-Teller-like distortions for $SiH_{4}^{+}$ and eventually molecular collapse on further ionisation Author Van Alsenoy, C. March, N.H. Faculty/Department Faculty of Sciences. Chemistry Faculty of Sciences. Physics Publication type article Publication 2013 Basel , 2013 Subject Mathematics Chemistry Source (journal) Journal of mathematical chemistry. - Basel Volume/pages 51(2013) :1 , p. 117-124 ISSN 0259-9791 ISI 000312907600008 Carrier E Target language English (eng) Full text (Publishers DOI) Affiliation University of Antwerp Abstract We have recently studied by quantum-chemical calculations some fifteen tetrahedral and octahedral molecules. These seemingly disparate numerical tabulations were, it was demonstrated, pulled together by comparison with model semiclassical scaling laws for (i) nuclear-nuclear repulsion energy at the equilibrium geometry and (ii) total energies likewise. Here, we again appeal to such model scaling predictions, but now for positive ions of SiH4. We then report Hartree-Fock equilibrium geometries and MP2 corrections. For , we assumed the symmetry to be C-2v , by analogy with for which experimental confirmation of this symmetry is available. Larger distortions, but still for C-2v symmetry, are found from our quantum-chemical studies in the case of . But for there is a marked tendency to return to a configuration quite close to tetrahedral symmetry. But non-convergence is found for . Finally relations to the admittedly simplistic semiclassical geometry scaling predictions of Lawes and March are conjectured. E-info https://repository.uantwerpen.be/docman/iruaauth/0d58ce/7d63637.pdf http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000312907600008&DestLinkType=RelatedRecords&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000312907600008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 Handle