Field ionization of high-Rydberg fragments produced after inner-shell photoexcitation and photoionization of the methane molecule
- Department of Physics, Lund University, P.O. Box 118, 22100 Lund (Sweden)
- Department of Physics, University of Oulu, P.O. Box 3000, 90014 Oulu (Finland)
- MAX IV Laboratory, Lund University, P.O. Box 118, 22100 Lund (Sweden)
- Colegio Los Naranjos, Fuenlabrada, 28941 Madrid (Spain)
- Elettra-Sincrotrone Trieste, Area Science Park Basovizza, 34149 Trieste (Italy)
We have studied the production of neutral high-Rydberg (HR) fragments from the CH{sub 4} molecule at the C 1s → 3p excitation and at the C 1s ionization threshold. Neutral fragments in HR states were ionized using a pulsed electric field and the resulting ions were mass-analyzed using an ion time-of-flight spectrometer. The atomic fragments C(HR) and H(HR) dominated the spectra, but molecular fragments CH{sub x}(HR), x = 1-3, and H{sub 2}(HR) were also observed. The production of HR fragments is attributed to dissociation of CH{sub 4}{sup +} and CH{sub 4}{sup 2+} ions in HR states. Just above the C 1s ionization threshold, such molecular ionic states are created when the C 1s photoelectron is recaptured after single or double Auger decay. Similar HR states may be reached directly following resonant Auger decay at the C 1s → 3p resonance. The energies and geometries of the parent and fragment ions have been calculated in order to gain insight into relevant dissociation pathways.
- OSTI ID:
- 22489604
- Journal Information:
- Journal of Chemical Physics, Vol. 143, Issue 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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