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Desorption induced by low energy charge carriers on Si(111)‐7 × 7: First principles molecular dynamics for benzene derivates
Author(s) -
Utecht Manuel,
Gaebel Tina,
Klamroth Tillmann
Publication year - 2018
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.25607
Subject(s) - chlorobenzene , chemistry , physisorption , benzene , toluene , desorption , ion , chemical physics , resonance (particle physics) , binding energy , molecular dynamics , atomic physics , electron affinity (data page) , electron , fluorobenzene , computational chemistry , molecule , adsorption , organic chemistry , physics , quantum mechanics , catalysis
We use clusters for the modeling of local ion resonances caused by low energy charge carriers in STM‐induced desorption of benzene derivates from Si(111)‐7 × 7. We perform Born–Oppenheimer molecular dynamics for the charged systems assuming vertical transitions to the charged states at zero temperature, to rationalize the low temperature activation energies, which are found in experiment for chlorobenzene. Our calculations suggest very similar low temperature activation energies for toluene and benzene. For the cationic resonance transitions to physisorption are found even at 0 K, while the anion remains chemisorbed during the propagations. Further, we also extend our previous static quantum chemical investigations to toluene and benzene. In addition, an in depth analysis of the ionization potentials and electron affinities, which are used to estimate resonance energies, is given. © 2018 Wiley Periodicals, Inc.