Synchrotron-based valence shell photoionization of CH radical.
J Chem Phys
; 144(20): 204307, 2016 May 28.
Article
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| MEDLINE
| ID: mdl-27250306
We report the first experimental observations of X(+) (1)Σ(+)âX (2)Π and a(+) (3)ΠâX (2)Π single-photon ionization transitions of the CH radical performed on the DESIRS beamline at the SOLEIL synchrotron facility. The radical was produced by successive hydrogen-atom abstractions on methane by fluorine atoms in a continuous microwave discharge flow tube. Mass-selected ion yields and photoelectron spectra were recorded as a function of photon energy using a double imaging photoelectron/photoion coincidence spectrometer. The ion yield appears to be strongly affected by vibrational and electronic autoionizations, which allow the observation of high Rydberg states of the neutral species. The photoelectron spectra enable the first direct determinations of the adiabatic ionization potential and the energy of the first triplet state of the cation with respect to its singlet ground state. This work also brings valuable information on the complex electronic structure of the CH radical and its cation and adds new observations to complement our understanding of Rydberg states and autoionization processes.
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Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
J Chem Phys
Año:
2016
Tipo del documento:
Article
País de afiliación:
Francia
Pais de publicación:
Estados Unidos