Field ionization of high-Rydberg fragments produced after inner-shell photoexcitation and photoionization of the methane molecule

We have studied the production of neutral high-Rydberg (HR) fragments from the CH4 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 CHx(HR), x = 1-3, and H-2(HR) were also observed. The production of HR fragments is attributed to dissociation of CH4+ and CH42+ 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. (C) 2015 AIP Publishing LLC.

Sankari, AnnaLund University,Lunds universitet,Synkrotronljusfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Synchrotron Radiation Research,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)slju-asi (författare)
Kettunen, J. A. (författare)
Stråhlman, ChristianLund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory(Swepub:lu)maxl-csm (författare)
Ruiz, J. Alvarez (författare)
Richter, R. (författare)
SynkrotronljusfysikFysiska institutionen (creator_code:org_t)

Av författaren/redakt...: Kivimaki, A.; Sankari, Anna; Kettunen, J. A.; Stråhlman, Chris ...; Ruiz, J. Alvarez; Richter, R.

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