Yields and Time-of-Flight Spectra of Neutral High-Rydberg Fragments at the K Edges of the CO2 Molecule.
We have studied the production of neutral fragments in high-Rydberg (HR) states at the C 1s and O 1s edges of the CO2 molecule by performing two kinds of experiments. First, the yields of neutral HR fragments were measured indirectly by ionizing such fragments in a static electric field and by collecting resulting singly charged positive ions as a function of the photon energy. Such measurements reveal not only excitations below the core ionization thresholds but also thresholds for single core-hole and shakeup photoionization. Second, we obtained the mass spectra of neutral HR fragments at selected photon energies by exploiting pulsed field ionization; they show atomic fragments C(HR) and O(HR). We discuss dissociation pathways leading to the production of neutral HR fragments in core excitation and ionization of CO2.
CNR - Istituto Officina dei Materiali (IOM), Laboratorio TASC , 34149 Trieste, Italy.
Antti
A
Kivimäki
MAX IV Laboratory, Lund University , P.O. Box 118, 22100 Lund, Sweden.
Christian
C
Stråhlman
Department of Physics of Electronic Phenomena, Gdansk University of Technology , ul. G. Narutowicza 11/12, 80-233 Gdansk, Poland.
Tomasz J
TJ
Wasowicz
Department of Physics, University of Oulu , P.O. Box 3000, 90014 Oulu, Finland.
J A
JA
Kettunen
Elettra - Sincrotrone Trieste , Area Science Park Basovizza, 34149 Trieste, Italy.
Robert
R
Richter