Photodetachment of O^- Yielding O(1D_2, {}^3P) Atoms, Viewed with Velocity Map Imaging
Abstract
lectron photodetachment of O^-(2P3/2,1/2) is measured using velocity-map imaging at wavelengths near 350 nm, where detachment yields both O(^1D_2) 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, and intensity ratios, 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. However, more exact evaluation is only possible with information about the matrix element phases. Research supported by the Australian Research Council Discovery Project GrantDP160102585. physics.nist.gov/cgi-bin/ASD/energy1.pl O. Scharf and M. R. Godefried, arXiv:0808.3529v1 O. Zatsarinny and K. Bartschat, Phys. Rev. A, 73, 022714 (2006). doi:10.1103/PhysRevA.73.022714- Publication:
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71st International Symposium on Molecular Spectroscopy
- Pub Date:
- June 2016
- DOI:
- 10.15278/isms.2016.RJ07
- Bibcode:
- 2016isms.confERJ07G
- Keywords:
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- Comparing theory and experiment