| Issue |
Europhys. Lett.
Volume 45, Number 1, January I 1999
|
|
|---|---|---|
| Page(s) | 32 - 37 | |
| Section | Physics of gases, plasmas, and electrical discharges | |
| DOI | https://doi.org/10.1209/epl/i1999-00127-x | |
| Published online | 01 September 2002 | |
Measurements of negative-ion densities by cavity ringdown spectroscopy
Institut für Laser- und Plasmaphysik, Universität GH Essen - D-45117 Essen, Germany
Received:
7
September
1998
Accepted:
30
October
1998
We report in this letter the first application of Cavity Ringdown Spectroscopy
(CRDS) to the quantitative detection of negative ions —
-ions in a magnetic
multipole source in this specific case. The absorption connected with the
photodetachment process is measured. A pulsed (
)
green (
) laser (Nd:YAG with SHG) beam is radiated into a high-Q cavity containing
the discharge plasma. The temporal behaviour of the decaying pulse at the
cavity exit yields the density of absorbing -ions on the basis of the known
(broadband) photodetachment cross-section. The densities determined by CRDS
agree well with earlier measurements obtained with a multipass scheme and
with the alternative method which consists in the detection with a Langmuir
probe of the electrons released in the photodetachment process.
PACS: 52.70.-m – Plasma diagnostic techniques and instrumentation / 52.70.Kz – Optical (ultraviolet, visible, infrared) measurements / 52.25.Rv – Emission, absorption, and scattering of visible and infrared radiation
© EDP Sciences, 1999
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