\title{VIBRATIONAL ZEKE PHOTOELECTRON SPECTROSCOPY OF CHLOROBENZENE
CATION}
\author{\underline{SERGEY~I.~PANOV}}
\address{Laser Spectroscopy Facility, Department of Chemistry, The
Ohio State University, Columbus, OH 43210}
\author{TIMOTHY~G.~WRIGHT}
\address{Chemistry Department,
The University, Southampton, United Kingdom S09 1NH}
\author{~and~TERRY~A.~MILLER}
\address{Laser Spectroscopy Facility, Department of Chemistry, The
Ohio State University, Columbus, OH 43210}
\begin{document}
\maketitle
Zero-kinetic-energy (ZEKE) photoelectron spectroscopy was used to probe the vibrational levels in the ground electronic state of the chlorobenzene cation using a two-color photoionization scheme via the S${_1}$ electronic state of the neutral\footnote{T.~G.~Wright, S.~I.~Panov and T.~A.~Miller \textit{J.~Chem.~Phys.} \underline{\textbf{102}}(12), XXXX March 1995.}. Exciting through different S${_1}$ vibrational levels has revealed mixing of some S${_1}$ normal coordinates in the ground state of the cation. A previously-identified Fermi resonance in the S${_1}$ state of the neutral is also confirmed by the ZEKE spectra. The adiabatic ionization energy is measured as $73\,170\pm5$\,cm$^{-1}$.
\end{document}