23 February 2000 Low-power radio-frequency capacitively coupled plasma in air: an alternative spectral source?
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Proceedings Volume 4068, SIOEL '99: Sixth Symposium on Optoelectronics; (2000) https://doi.org/10.1117/12.378643
Event: SIOEL: Sixth Symposium of Optoelectronics, 1999, Bucharest, Romania
The low power radio frequency capacitively coupled plasma sustained in air at atmospheric pressure is described with the aim of using it as spectral source for atomic emission spectroscopy of pneumatically nebulized liquid samples and the direct analysis of non-conductive solid samples. The plasma was generated at a frequency of 13.56 MHz, absorbed RF powers of 20-70 W and air flow rates of 0.1-11/min, begin intrinsic part of the resonant circuit of a free-running oscillator. The liquid samples were pneumatically nebulized using a Meinhard nebulizer and introduced into the plasma via a 4-roller peristaltic pump. The rotational temperature and the intensity ratio of ion to atom lines for Ca were determined experimentally. Detection limits were determined using the '3(sigma) method' given by Boumans for 11 elements at an RF power of 50 W and air flow-rate of 0.7 1/min. The same plasma was used for the direct analysis of non- conductive solid samples. All measurements have been carried out on cylindrical samples pellets of chalk, pressed in a steel press at a pressure of 87 X 105 Pa, at an RF power of 40 W and air flow-rate of 0.5 1/min.
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Sorin Anghel, Sorin Anghel, Alpar Simon, Alpar Simon, Tiberiu Frentiu, Tiberiu Frentiu, Emil A. Cordos, Emil A. Cordos, } "Low-power radio-frequency capacitively coupled plasma in air: an alternative spectral source?", Proc. SPIE 4068, SIOEL '99: Sixth Symposium on Optoelectronics, (23 February 2000); doi: 10.1117/12.378643; https://doi.org/10.1117/12.378643

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