A method for extracting near-threshold partial cross sections from threshold photoelectron spectra
- 1 January 1995
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 28 (1), L1-L7
- https://doi.org/10.1088/0953-4075/28/1/001
Abstract
A method used to obtain the first state-selected cross sections for the near-threshold photoionization of argon from an analysis of threshold electron spectra is described. The yield of photoelectrons in the wings of threshold peaks is normalized by division with the efficiency function of the penetrating field threshold electron analyser, convoluted with a Gaussian photon beam profile. Although very non-uniform within the first 150 meV, the analyser efficiency function was found to have a particularly simple analytic form suitable for further numerical treatment. We have discussed the measured ratios of the two components of the lowest Ar+ 3p5 2P state in relation to the spectral repulsion theory of Fano and Cooper (1965, 1968). The potential of the technique is illustrated on the 3p4 (3P)3d 4F3/2 ion state cross section, showing enormous resonant peaks. The limitation in the general applicability of the method is also discussed.Keywords
This publication has 18 references indexed in Scilit:
- High resolution threshold photoelectron and photoion spectroscopy of oxygen in the 12-50 eV photon rangeJournal of Physics B: Atomic, Molecular and Optical Physics, 1994
- Threshold photoelectrons coincidence spectroscopy of doubly-charged ions of nitrogen, carbon monoxide, nitric oxide and oxygenJournal of Physics B: Atomic, Molecular and Optical Physics, 1994
- A penetrating field electron-ion coincidence spectrometer for use in photoionization studiesMeasurement Science and Technology, 1992
- Near-threshold study of the neon photoelectron satellitesJournal of Physics B: Atomic, Molecular and Optical Physics, 1991
- Photoionization phenomena near the double-ionization threshold of heliumJournal of Physics B: Atomic, Molecular and Optical Physics, 1991
- Observation of the argon photoelectron satellites near thresholdJournal of Physics B: Atomic, Molecular and Optical Physics, 1989
- Quantum defect theory. XIII. Radiative transitionsJournal of Physics B: Atomic and Molecular Physics, 1984
- A new technique for threshold excitation spectroscopyJournal of Physics B: Atomic and Molecular Physics, 1974
- Spectral Distribution of Atomic Oscillator StrengthsReviews of Modern Physics, 1968
- Line Profiles in the Far-uv Absorption Spectra of the Rare GasesPhysical Review B, 1965