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|Title:||Luminescence from Liquid Helium Excited by Corona Discharges|
von Haeften, Klaus
Atrazhev, V. M.
Shakhatov, V. A.
|Publisher:||Institute of Electrical and Electronics Engineers (IEEE)|
|Citation:||Dielectrics and Electrical Insulation, IEEE Transactions on, 2009, 16 (3), pp. 742 - 750.|
|Abstract:||Liquid helium (LHe) at 4.2 K was electronically excited using a corona discharge for both negative and positive high voltages. The experiments were carried out for different pressures in the range from 0.1 to 10 MPa at constant temperature. The light emitted from the zone close to the tip was spectroscopically analyzed showing features from atoms and excimer helium. The shifts and widths of the observed lines and bands were found to depend on the applied hydrostatic pressure and on the tip polarity. Our analysis showed that classic pressure broadening theory cannot account for the observed widths and shifts rather than the presence of bubbles which surround single excited atoms and molecules. For positive tip polarities red shifted features distinct from pure He and He2* were observed and tentatively assigned to “red satellites”.|
|Rights:||This paper was published as Dielectrics and Electrical Insulation, IEEE Transactions on, 2009, 16 (3), pp. 742-750. Copyright © 2009 IEEE. It is available from http://ieeexplore.ieee.org. Doi: 10.1109/TDEI.2009.5128514. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Leicester’s products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to email@example.com. By choosing to view this document, you agree to all provisions of the copyright laws protecting it.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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