Effect of a magnetic field in photodetachment microscopy |
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Authors: | W Chaibi R J Peláez C Blondel C Drag and C Delsart |
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Institution: | (1) Department of Applied Mathematics and Theoretical Physics, Queen's University Belfast, University Road, BT7 1NN Belfast, Northern Ireland, UK;(2) Department of Enterprise Trade and Investment, Northern Ireland Civil Service, Massey Avenue, BT4 2JP Belfast, Northern Ireland, UK;(3) Solution Design, British Telecommunications, Riverside Tower (pp RT03-44), BT1 3BT Belfast, Northern Ireland, UK;(4) Dept. of Applied Mathematics and Theoretical Physics, Queen's University Belfast, BT7 1NN Belfast, Northern Ireland, UK;(5) Department of Applied Mathematics and Theoretical Physics, Queen's University Belfast, University Road, BT7 1NN Belfast, UK;(6) Department of Applied Mathematics and Theoretical Physics, Queen's University Belfast, University Road, Northern Irland BT7 1NN Belfast, UK |
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Abstract: | The effect of an external static magnetic field of
arbitrary orientation with respect to the electric field, on the electron
interference ring patterns observed by the photodetachment microscope is
studied both experimentally and theoretically. The design of the interaction
chamber has been modified to superimpose a controlled uniform magnetic field
on the whole volume accessible to the interfering electron. Contrary to a
previous study in weaker fields, where the overall dimension of the
interferogram was not modified, the effect of the magnetic field here
encompasses a regime of magnetic refocusing. A quantitative analysis is
carried out using a closed-orbit perturbative calculation of the
interference phase at the centre of the ring pattern. The essential result
of this work is still the invariance of the extreme interference phase
whatever the direction and magnitude of the applied magnetic field, up to
values 100 times larger than in the previous experimental study. This
property can be applied to revise former electron affinity measurements.
Partly due to the previously unsuspected robustness of the electron
interferograms vs. magnetic fields, partly thanks to the 2006 CODATA
revision of the energy conversion factors, one can update the values of the
electron affinities of 16O, 28Si and 32S to 1.4611134(9),
1.3895210(7) and 2.0771040(6) eV respectively. |
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Keywords: | |
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