Mm. Rahman et Mw. Blades, ATMOSPHERIC-PRESSURE, RADIO-FREQUENCY, PARALLEL-PLATE CAPACITIVELY COUPLED PLASMA - EXCITATION TEMPERATURES AND ANALYTICAL FIGURES OF MERIT, Spectrochimica acta, Part B: Atomic spectroscopy, 52(13), 1997, pp. 1983-1993
Electronic excitation (T-exc) and rotational (T-rot) temperatures were
determined for a parallel plate capacitively coupled rf plasma operat
ing at atmospheric pressure. T-exc was calculated from the slope of th
e Boltzmann plot using Fe and He as the thermometric species and Ph ex
citation temperature was calculated using the two line method. Over a
power range from 100 W to 250 W, excitation temperatures are 3255-3900
K for He, 3540-4500 K for Pb, and 4300-4890 K for Fe. The rotational
temperature was measured using both OK and N-2(+) molecular spectra an
d the values are in the range of 828-911 K and 845-956 K respectively
over a power range of 75-275 W. Signal-to-noise ratios, signal-to-back
ground ratios, and absolute detection limit for lead (0.33 ng) and sil
ver (24 pg) are also reported. (C) 1997 Elsevier Science B.V.