MATRIX EFFECTS OF EASILY IONIZED ELEMENTS ON THE SPATIAL-DISTRIBUTION OF ELECTRON NUMBER DENSITIES IN AN INDUCTIVELY COUPLED PLASMA USING AN OPTICAL FIBER PROBE AND A PHOTODIODE ARRAY SPECTROMETER

作者：JIAN X^*; LI QY; LI WC; QIAN HW; TAN JY; ZHANG ZX

来源：Journal of Analytical Atomic Spectrometry, 1992, 7(2): 131-134.

DOI：10.1039/ja9920700131

• EASILY IONIZED ELEMENT
• INDUCTIVELY COUPLED PLASMA
• ELECTRON NUMBER DENSITY
• PHOTODIODE ARRAY SPECTROMETER
• OPTICAL FIBER PROBE

The effects of alkali and alkaline earth metals on the spatial distribution of electron number densities (n(e)) in an inductively coupled plasma have been studied. An optical fibre probe was used to sample the spatial position of the plasma and the photodiode array spectrometer to detect the H-beta-line. The resultant lateral profiles were subjected to an Abel inversion. An on-line intelligent background correction method was used to correct the background under the H-beta-line, whose full width at half maximum was then calculated automatically. Graphs of three-dimensional spatial distributions of n(e) in the presence of K, Na and Ca are compared with that of water. At an observation height of 7.2 mm above the load coil, the n(e) increased with decreasing ionization potentials of the elements. At an observation height of 9.6 mm, no measurable increase of n(e) is observed except for K.

• 出版日期1992-3
• 单位中山大学