Field ionization of high-Rydberg fragments produced after inner-shell photoexcitation and photoionization of the methane molecule
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- OSTI Identifier:
- 22489604
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 143; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; DISSOCIATION; ELECTRIC FIELDS; EXCITATION; IONS; METHANE; MOLECULES; PHOTOIONIZATION; PULSES; RESONANCE; SPECTRA; TIME-OF-FLIGHT SPECTROMETERS
Citation Formats
Kivimäki, A., E-mail: kivimaki@iom.cnr.it, Sankari, A., Kettunen, J. A., Stråhlman, C., Álvarez Ruiz, J., and Richter, R. Field ionization of high-Rydberg fragments produced after inner-shell photoexcitation and photoionization of the methane molecule. United States: N. p., 2015.
Web. doi:10.1063/1.4931105.
Kivimäki, A., E-mail: kivimaki@iom.cnr.it, Sankari, A., Kettunen, J. A., Stråhlman, C., Álvarez Ruiz, J., & Richter, R. Field ionization of high-Rydberg fragments produced after inner-shell photoexcitation and photoionization of the methane molecule. United States. https://doi.org/10.1063/1.4931105
Kivimäki, A., E-mail: kivimaki@iom.cnr.it, Sankari, A., Kettunen, J. A., Stråhlman, C., Álvarez Ruiz, J., and Richter, R. 2015.
"Field ionization of high-Rydberg fragments produced after inner-shell photoexcitation and photoionization of the methane molecule". United States. https://doi.org/10.1063/1.4931105.
@article{osti_22489604,
title = {Field ionization of high-Rydberg fragments produced after inner-shell photoexcitation and photoionization of the methane molecule},
author = {Kivimäki, A., E-mail: kivimaki@iom.cnr.it and Sankari, A. and Kettunen, J. A. and Stråhlman, C. and Álvarez Ruiz, J. and Richter, R.},
abstractNote = {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.},
doi = {10.1063/1.4931105},
url = {https://www.osti.gov/biblio/22489604},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 11,
volume = 143,
place = {United States},
year = {Mon Sep 21 00:00:00 EDT 2015},
month = {Mon Sep 21 00:00:00 EDT 2015}
}