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Issue 5, 2000
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This report is the first study on the formation, stabilization and fundamental investigation of free-running helium inductively coupled plasmas (He ICPs). The plasma was operated at 600–900 W with a total helium gas flow of less than 10 L min−1. The shape and the physical appearance of free-running helium plasmas differ markedly from the He ICP sources reported previously using a crystal-controlled generator. Although the free-running helium plasma appears annular, high-speed video studies reveal that the plasma rotates at a frequency of 75–275 Hz. Lateral profiles of emission spectra of the free-running discharge viewed end-on provide rotational temperature (Trot), excitation temperature (Texc), and electron number density (ne) of 1600–1800 K, 3800–4300 K, and 3.0 to 12 × 1013 cm−3, respectively. These fundamental characteristics are compared to those reported previously for crystal-controlled He ICPs and Ar ICPs.

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The article was received on 16 Nov 1999, accepted on 28 Feb 2000 and first published on 27 Apr 2000

Article type: Paper
DOI: 10.1039/A909063K
J. Anal. At. Spectrom., 2000,15, 491-498

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    Formation and fundamental characteristics of novel free-running helium inductively coupled plasmas

    L. A. Iacone, W. R. L. Masamba, S. Nam, H. Zhang, M. G. Minnich, A. Okino and A. Montaser, J. Anal. At. Spectrom., 2000, 15, 491
    DOI: 10.1039/A909063K

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