Electronic Resource
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
72 (1998), S. 2391-2393
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A diagnostic scheme for the measurement of the O− density in afterglow plasmas is proposed and demonstrated. The present method is based on the fact that excited oxygen atoms (O*) are produced by mutual neutralization between positive and negative ions (O++O−→O*+O). The absolute value of the emission coefficient cursive-epsilonn due to O*→O+hν is determined by visible emission spectroscopy with a calibrated detection system. The O+ density nO+ is measured by a Langmuir probe combined with mass spectrometry. With the rate coefficient for the above reaction kn, the O− density can be evaluated as nO−=cursive-epsilonn/(knnO+). In the present letter, the rate coefficient kn has been determined experimentally from nO− measured by probe-assisted laser photodetachment. © 1998 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.121394
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