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Photoelectron Spectroscopic Study of the First Singlet and Triplet States of the Cyclopentadienyl Cation
Author(s) -
Wörner Hans Jakob,
Merkt Frédéric
Publication year - 2005
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200503032
Subject(s) - excitation , excited state , singlet state , atomic physics , chemistry , ionization , ground state , triplet state , x ray photoelectron spectroscopy , spectral line , cyclopentadienyl complex , ionization energy , ion , photochemistry , physics , nuclear magnetic resonance , biochemistry , organic chemistry , quantum mechanics , astronomy , catalysis
From radical to biradical : The pulsed‐field‐ionization zero‐kinetic‐energy photoelectron spectrum of the C 5 H 5 radical is recorded after direct excitation from the X̃ 2 ${{{\rm {\rm E}}{{\prime\prime \hfill \atop 1\hfill}}}}$ ground state and two‐photon excitation via the à 2 ${{{\rm {\rm A}}{{\prime\prime \hfill \atop 2\hfill}}}}$ electronically excited state. The intensity distributions of the spectra enables the characterization of the energetics, symmetry, and structure of the lowest two electronic states of the cation (see picture).