CRCU

Chemical Research in Chinese Universities ›› 2006, Vol. 22 ›› Issue (5): 560-565.doi:

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Studies on Excitation and Rotational Temperatures of an Oxygen-shielded Argon Microwave Plasma Torch Source

WANG Shu-hua1, LI Guo-zhen2, ZHOU Jian-guang1 and JIN Qin-han1
   

    1. Institute of Miniature Analytical Instrumentation, College of Chemistry, Jilin University, Jilin Province Research Center for Engineering and Technology of Spectral Analytical Instruments, Changchun 130021, P. R. China;
    2. Department of Physics, Bohai University, Jinzhou 121000, P. R. China
  • Received:2006-01-16 Revised:1900-01-01 Online:2006-09-25 Published:2006-09-25
  • Contact: JIN Qin-han E-mail:qhjin@mail.jlu.edu.cn

Abstract: Excitation(Texc) and rotation(Trot) temperatures were determined under different conditions for an oxygen-shielded argon microwave plasmsa torch source(OS-Ar-MPT). The Texc value, which was shown to be between 4300 and 5250 K under different operating conditions, was calculated from the slope of the Boltzmann plot with Fe as the thermometric species. The Trot value, which was in the range of 2100—2500 K, was measured with OH molecular spectra. The influences of microwave power, flow rates of the support gas, carrier gas, and shielding gas, as well as the observation height on Texc and Trot were investigated and discussed. The detailed results of Texc and Trot provided a better understanding of the performance of an OS-ArMPT as a source for atomic emission spectrometry.

Key words: Microwave plasma torch(MPT), Excitation temperature, Rotational temperature