Gradziel, Marcin and O'Neill, R.W.
(2004)
Direct measurement of P+ for electron impact
excitation of H(2p) at 54.4 eV.
Journal of Physics B: Atomic, Molecular and Optical Physics, 37 (9).
pp. 1893-1907.
ISSN 0953-4075
Abstract
We report results of direct measurements of the reduced Stokes parameters \skew{-1}\bar{P_1}, \bar{P_2} and \skew{-1}\bar{P_3} for electron impact excitation of H(2p) at 54.4 eV over the scattering range 10–40°. These three parameters have been measured simultaneously for the first time using a VUV double-rotation polarization analyser consisting of a MgF2 retarder followed by a SiO2 reflection linear polarizer. As expected, our measurements for \skew{-1}\bar{P_1} and \bar{P_2} are in good agreement with theoretical calculations and previous experimental data. Our data for \skew{-1}\bar{P_3} differ significantly from previous experimental measurements and theoretical calculations. Consequently, we find that the coherence parameter P+ deviates significantly from unity at 30°. If correct, this signifies that spin-exchange scattering may be more important than has previously been thought.
Item Type: |
Article
|
Additional Information: |
This work was supported by an Enterprise Ireland Basic Research Grant. M L Gradziel
gratefully acknowledges the receipt of a Daniel O’Connell Research Scholarship from NUI
Maynooth. The work would not have been possible without the excellent technical support of
David Watson and Bill Lanigan. |
Keywords: |
Direct measurement; electron impact excitation; reduced Stokes parameters; |
Academic Unit: |
Faculty of Science and Engineering > Experimental Physics |
Item ID: |
9790 |
Identification Number: |
https://doi.org/10.1088/0953-4075/37/9/010 |
Depositing User: |
Dr. Marcin Lukasz Gradziel
|
Date Deposited: |
17 Aug 2018 14:02 |
Journal or Publication Title: |
Journal of Physics B: Atomic, Molecular and Optical Physics |
Publisher: |
IOP Publishing |
Refereed: |
Yes |
Funders: |
Enterprise Ireland (EI) |
URI: |
|
Use Licence: |
This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available
here |
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