Issue |
Europhys. Lett.
Volume 36, Number 8, December II 1996
|
|
---|---|---|
Page(s) | 571 - 576 | |
Section | Atomic, molecular and optical physics | |
DOI | https://doi.org/10.1209/epl/i1996-00271-3 | |
Published online | 01 September 2002 |
Laser optogalvanic effect from Ar positive ions in a hollow-cathode discharge
Institute of Solid State Physics, Bulgarian Academy of Sciences,
72 Tzarigradsko Chaussee blvd., 1784 Sofia, Bulgaria
Received:
29
April
1996
Accepted:
24
October
1996
The optogalvanic effect from Ar positive-ion
transitions, corresponding to the spectral lines emitted by an
Ar laser, has been investigated in this work by using a hollow-cathode
glow discharge. The optogalvanic signal amplitude
and sign have been registered as a function of Ar pressure,
discharge current, radial position of the illuminating laser
beam and laser power. The change of intensity of the different
spectral lines of ArI, ArII and ArIII has been simultaneously
measured. The experimental results showed that the
optogalvanic signal has an amplitude one order of magnitude higher
in cathode dark space than in negative glow. The
correlation between the dependences of optogalvanic signal
and estimated number of charge-exchange collisions
vs. discharge current proved our assumption that these high-amplitude
optogalvanic signals were caused by increased
mobility as a result of decreased cross-section of charge
exchange collisions with participation of excited ions. The
additional secondary electron emission from cathode walls due
to
can also cause a significant part of the measured
optogalvanic signal. The contribution of other elementary
processes related to the
optogalvanic-effect appearance has
been discussed.
PACS: 32.90.+a – Other topics in atomic properties and interactions of atoms and ions with photons / 51.50.+v – Electrical properties (ionization, breakdown, electron and ion mobility, etc.) / 52.20.-j – Elementary processes in plasma
© EDP Sciences, 1996
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