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Structure and dynamics of the radical cation of ethane arising from the Jahn–Teller and pseudo-Jahn–Teller effects

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Jacovella, U. Stein, C. J. Grütter, M. Freitag, L. Lauzin, Clément [UCL] Merkt, F.

The pulsed-field-ionization zero-kinetic-energy photoelectron spectrum of C2H6 has been recorded in the region of the adiabatic ionization threshold. The partially rotationally resolved spectrum indicates the existence of several vibronic states of C2H6+ with less than 600 cm−1 of internal excitation. The analysis of the rotational structures assisted by ab initio calculations enabled the determination of the adiabatic ionization energy of C2H6and the investigation of the structure and dynamics of C2H6+ at low energies. The ground state of C2H6+ is found to be a 2Ag state of diborane-like structure with strongly mixed (a1g)−1 and (eg)−1 configurations. The vibrational structure reveals the importance of large-amplitude nuclear motions involving the diborane distortion modes, the C–C stretching motion, and the internal rotation at elongated C–C distances. The spectrum is analyzed in the light of the information obtained in earlier studies of C2H6+ by ab initio quantum chemistry, EPR spectroscopy and photoelectron spectroscopy.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2018
Language Anglais
Journal information "Physical Chemistry Chemical Physics" - Vol. 20, no. 2, p. 1072-1081 (2018)
Peer reviewed yes
Publisher Royal Society of Chemistry (RSC)
issn 1463-9076
e-issn 1463-9084
Publication status Publié
Affiliation UCL - SST/IMCN/NAPS - Nanoscopic Physics
Keywords Physical and Theoretical Chemistry ; General Physics and Astronomy
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Bibliographic reference Jacovella, U. ; Stein, C. J. ; Grütter, M. ; Freitag, L. ; Lauzin, Clément ; et. al. Structure and dynamics of the radical cation of ethane arising from the Jahn–Teller and pseudo-Jahn–Teller effects. In: Physical Chemistry Chemical Physics, Vol. 20, no. 2, p. 1072-1081 (2018)
Permanent URL http://hdl.handle.net/2078.1/195913