'International Symposium on Molecular Spectroscopy'
Doi
Abstract
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Electron photodetachment of O−(2P3/2,1/2) is measured using velocity-map imaging at wavelengths near 350~nm, where detachment yields both
O(1D2) and O(3P2,1,0) atoms, simultaneously, producing slow (∼0.1~eV) and fast electrons (∼2~eV).
The photoelectron spectrum resolves the fine-structure transitions, which together with the well known atomic fine-structure splittings,\footnote{physics.nist.gov/cgi-bin/ASD/energy1.pl} and intensity ratios,\footnote{O. Scharf and M. R. Godefried, arXiv:0808.3529v1} provide an excellent test of the spectral quality of the velocity-map imaging technique.
Although the photoelectron angular distribution for the two atomic limits have the same negative anisotropy sign, the energy dependence differs. The variation is qualitatively in accordance with R-matrix cross section calculations, that indicate a more gradual d-wave onset for the 1D limit.\footnote{O. Zatsarinny and K. Bartschat, \emph{Phys. Rev. A}, \textbf{73}, 022714 (2006). doi:10.1103/PhysRevA.73.022714} However, more exact evaluation is only possible with information about the matrix element phases