期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 47, 期 22, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/47/22/224013
关键词
mass spectrometry; plasma jet; reactive species; ozone; nitric oxide
资金
- Dutch Technology Foundation (STW)
- Foundation for Fundamental Research on Matter (FOM)
- German Federal Ministry of Education and Research [13N11188]
A molecular beam mass spectrometer has been calibrated and used to measure the air entrainment, nitric oxide and ozone concentrations in the effluent of a cold atmospheric pressure argon RF driven plasma jet. The approaches for calibrating the mass spectrometer for different species are described in detail. Gas phase densities of ozone and nitric oxide up to 7.5 ppm and 4 ppm, respectively, have been measured in the far effluent of the argon plasma jet. The difference in air entrainment when the plasma is undisturbed or is close to a well, which is the case for e. g. in vitro plasma-cell interaction studies, is shown. In addition, an exponential decay of the positive ion flux as a function of distance in the effluent is obtained. Furthermore, the effect of plasma power, duty cycle and air and O-2 admixtures introduced into the argon flow on the NO and O-3 production is presented, including the possibility of independent control of the NO and O-3 flux from the jet.
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