Absolute transition probability measurement of nondipole valence-shell (7–70 eV) electronic transitions of SF6 by angle-resolved electron energy loss spectroscopy
- 1 September 1993
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 99 (5) , 3390-3399
- https://doi.org/10.1063/1.465149
Abstract
A coplanar electron spectrometer has been constructed for angle‐resolved electron energy loss measurements. The experimental arrangement and performance of the spectrometer are described. Absolute absorption transition probabilities (or generalized oscillator strengths) of valence‐shell (7–70 eV) electronic transitions of SF6 have been determined as a function of energy loss and momentum transfer at an impact energy of 2.5 keV. New nondipole transitions have been observed at nonzero momentum transfer. Together with the term values obtained from previous dipole electron energy loss and photoabsorption measurements, the momentum transfer dependence of the transition probabilities can be used to provide tentative assignments of the observed nondipole valence‐shell transitions of SF6. Despite the complexity of the electronic structure of SF6, the present work demonstrates the feasibility of angle‐resolved electron energy loss spectroscopy for investigating nondipole phenomena and related electron‐induced excitation processes.Keywords
This publication has 58 references indexed in Scilit:
- Angle-resolved electron-energy-loss study of core-level electron excitation in molecules: Determination of the generalized oscillator strength for the carbon 1s(2→2) excitation inPhysical Review A, 1991
- Electron-impact excitation of acetylene above 12 eVPhysical Review A, 1988
- Analytic Representation of the Generalized Oscillator Strength for IonizationRadiation Research, 1985
- Absolute oscillator strengths (5-63 eV) for photoabsorption and ionic fragmentation of SF6Journal of Physics B: Atomic and Molecular Physics, 1979
- Observation of new electronic transitions in O2, CO, NO, CO2, and N2OThe Journal of Chemical Physics, 1977
- Photoabsorption cross-section measurements of some gases, from 10 to 50 nmJournal of Quantitative Spectroscopy and Radiative Transfer, 1977
- Generalized valence bond studies of the electronic structure of sulfur difluoride, sulfur tetrafluoride, and sulfur hexafluorideJournal of the American Chemical Society, 1977
- A kinematic and experimental investigation of the (e,2e) simulation of photoelectron spectroscopyJournal of Physics B: Atomic and Molecular Physics, 1976
- Evidence of Effective Potential Barriers in the X-Ray Absorption Spectra of MoleculesThe Journal of Chemical Physics, 1972
- Bremsformel f r Elektronen relativistischer GeschwindigkeitThe European Physical Journal A, 1932