Evaluation of argon metastable number densities in the inductively coupled plasma by continuum source absorption spectrometry

The effect of the sampling interface on spatial distributions of barium ions and atoms in an inductively coupled plasma ion source

“…Argon ion densities range between 10 14 cm − 3 and 10 15 cm − 3 [4]. Metastable atom densities range between 10 11 cm − 3 and 10 12 cm − 3 [27]. On balance, it appears that reaction (1) should be dominant.…”

Population Measurement of the 3p54s Configuration Levels in an Argon Microwave Plasma at Atmospheric Pressure

“…However, it can be noted that the values found by most authors were located in the 10 9 -10 12 cm À3 range, just where the values found in our work are located. 7,34,38…”

“…In the literature many studies can be found that are devoted to the determination of argon metastable levels for different types of discharges and/or different experimental conditions. The external radiation sources used in these cases were spectral lamps, 4,7,10,16,[32][33][34] lasers, 15,27,[35][36][37] or even discharges. 4,38 One of the most important advantages of methods based on radiation absorption lies in their versatility, but these methods present a series of difficulties associated with using an external radiation source, which include the following:…”

“…This is due to the fact that the fraction of radiation absorbed by the medium in optically thin conditions is inversely proportional to the monochromator spectral bandwidth. 34 (5) The absorbing medium always emits the same line for which the absorption is measured. An intense emission line from the medium needs to be discriminated (by modulation techniques) against the same line emitted from the primary excitation source.…”

Experimental Method for Determining the Damping Parameter of Spectral Lines Emitted by a Microwave Plasma at Atmospheric Pressure

“…Hasegawa and Haraguchi, 6 Kawaguchi et al, 7 and Human and Scott 8 have measured the a-parameter for the lines emitted by samples of different elements placed in an argon ICP, finding that the Doppler broadening was predominant compared to the Lorentzian one (a Ͻ 1). Hart et al 29 have also determined experimentally the a value for different lines 4p-4s in an argon ICP. They used a completely different procedure based on the comparison of growth curves obtained theoretically and experimentally and which depended on a (used before by McGee and Winefordner 9 ), obtaining values lower than the unit and similar to those reported in this paper.…”