کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1239885 | 1495726 | 2012 | 6 صفحه PDF | دانلود رایگان |
The frequency response of a free running RF generator was evaluated for its ability to provide plasma diagnostic information. A small probe coil in the plasma torch housing and a frequency counter were used for frequency measurement. A linear dependence between the RF generator frequency and the flow of a foreign gas (CO2, H2, He, N2—introduced into the central channel of the ICP) was encountered. Moreover, the inductively coupled plasma (ICP) was found to extinguish at a constant, characteristic frequency when the flow of foreign gas was too high, allowing a simple prediction of the maximal tolerable foreign gas flow. Spectroscopic plasma diagnostic techniques (Mg II/Mg I ratio, excitation temperature and rotational temperature) were also investigated but provided little indication of instable plasma conditions due to the addition of foreign gases.
► Frequency response of a free running RF generator for plasma diagnostics.
► Linear dependence of the RF generator frequency on foreign gas flow (CO2, H2, He, N2).
► ICP extinction frequency is independent from the foreign gas.
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volumes 71–72, May–June 2012, Pages 48–53