Microsample introduction by tungsten filament electrode into capacitively coupled microwave plasma for atomic emission spectroscopy: diagnostics

✍ Scribed by Abdalla H. Ali; James D. Winefordner

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 519 KB
• Volume: 264
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)87021-c

✦ Synopsis

AbStlXt A microwave plasma based on a capacitively coupled microwave plasma was developed and several dlagnostlcal parameters were evaluated This plasma was sustained at powers as low as 25 W with He as the plasma gas RotatIonal (2500 K) and excltatlon (4500 K) temperatures were determined from N: and Fe, respectwely The rotational and excltatlon temperatures were independent of power (35-l 15 W), radial (-3 to + 3 mm) and axial (l-7 mm) positions, and the He plasma gas flow-rate (4-8 1 mu-') The excitation temperature decreased slightly with plasma gas flow-rate between 3 and 4 1 mm-' while the rotational temperature remamed constant The electron density (4 x 1Ol4 cnC3) also remained unchanged with both power and radial distances