TY  - JOUR
A1  - Fischer, Kathrin H.
A1  - Hemberger, Patrick
A1  - Bodi, Andras
A1  - Fischer, Ingo
T1  - Photoionisation of the tropyl radical
JF  - Beilstein Journal of Organic Chemistry
N2  - We present a study on the photoionisation of the cycloheptatrienyl (tropyl) radical, \(C_7H_7\), using tunable vacuum ultraviolet synchrotron radiation. Tropyl is generated by flash pyrolysis from bitropyl. Ions and electrons are detected in coincidence, permitting us to record mass-selected photoelectron spectra. The threshold photoelectron spectrum of tropyl, corresponding to the 
\(X^{+1}A1’ ← X^2E_2”\) transition, reveals an ionisation energy of 6.23 ± 0.02 eV, in good agreement with Rydberg extrapolations, but slightly lower than the value derived from earlier photoelectron spectra. Several vibrations can be resolved and are reassigned to the C–C stretch mode \(ν_{16}^+\) and to a combination of \(ν_{16}^+\) with the ring breathing mode \(ν_2^+\). Above 10.55 eV dissociative photoionisation of tropyl is observed, leading to the formation of \(C_5H_5^+\) and \(C_2H_2\).
KW  - threshold photoelectron spectroscopy
KW  - gas phase
KW  - dissociative photoionisation
KW  - reactive intermediates
KW  - synchrotron radiation
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-128652
VL  - 9
ER  -