Multiphoton laser ionization for energy conversion in barium vapor

We have studied the ion detection of barium atoms in special heated ovens with a tungsten rod in the middle of the stainless steel tube. The tungsten rod was heated indirectly by the oven body heaters. A bias voltage between the cell body and the tungsten rod of 9V was used to collect electrons, aft...

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Bibliographic Details
Published in:Optics communications 2013-03, Vol.290, p.95-99
Main Authors: Makdisi, Y., Kokaj, J., Afrousheh, K., Mathew, J., Nair, R., Pichler, G
Format: Article
Language:English
Subjects:
Barium vapor
Bias
Electric potential
Energy conversion
Heat-pipe oven
Heaters
Ionization
Multi photon laser ionization
Ovens
Thermionic process
Thermionics
Tungsten
Voltage
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Summary:We have studied the ion detection of barium atoms in special heated ovens with a tungsten rod in the middle of the stainless steel tube. The tungsten rod was heated indirectly by the oven body heaters. A bias voltage between the cell body and the tungsten rod of 9V was used to collect electrons, after the barium ions had been created. However, we could collect the electrons even without the bias voltage, although with ten times less efficiency. We studied the conditions for the successful bias-less thermionic signal detection using excimer/dye laser two-photon excitation of Rydberg states below and above the first ionization limit (two-photon wavelength at 475.79nm). We employed a hot-pipe oven and heat-pipe oven (with inserted mesh) in order to generate different barium vapor distributions inside the oven. The thermionic signal increased by a factor of two under heat-pipe oven conditions.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2012.10.031