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Slow Photoelectron Spectroscopy of 3‑Hydroxyisoquinoline
journal contribution
posted on 2013-08-29, 00:00 authored by Yi Pan, Kai-Chung Lau, Lionel Poisson, Gustavo
A. Garcia, Laurent Nahon, Majdi HochlafWe studied the single photon ionization of gas phase
3-hydroxyisoquinoline
by means of VUV synchrotron radiation coupled to a velocity map imaging
electron/ion coincidence spectrometer. Near the ionization thresholds
of 3-hydroxyisoquinoline, the photoionization is found to occur mainly
via a direct process. The spectra are assigned with the help of theoretical
calculations on the equilibrium geometries, electronic states patterns,
harmonic and anharmonic wavenumbers of the lactim and lactam forms
of 3-hydroxyisoquinoline and their cations. The slow photoelectron
spectrum (SPES) of this lactim is dominated by vibrational transitions
to the X̃ state of the cation. In addition, several weaker and
complex bands are observed, corresponding to the population of the
vibrational bands (pure or combination) of the à electronically excited state of the cation. The adiabatic ionization
energy of 3-hydroxyisoquinoline and the lowest electronic state energetics
of the lactim and lactam cationic forms are determined.
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equilibrium geometriesSlow Photoelectron Spectroscopyhydroxyisoquinolineadiabatic ionization energylactimanharmonic wavenumbersVUV synchrotron radiationvibrational bandslactam formsphotoelectron spectrumstates patternsionization thresholdsphoton ionizationlactam cationic formsSPESstate energeticsvibrational transitions
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