Measurement of kinetic temperature and terminal velocity for argon atom and calcium ionin inductively coupled plasma mass spectrometry
MA Hai-bin1, SUN Zi-jie2
1. College of Chemistry, Chemical & Environmental Engineering, Weifang University, Weifang 261061, China; 2. Institute for Environmental Reference Materials, Ministry of Environmental Protection, Beijing 100029, China
Abstract：In order to guarantee the optimal detection property of inductively coupled plasma mass spectrometry (ICP-MS), the different analytical ions should pass the sampling interface efficiently and continuously. Therefore, the understanding of non-ideal transfer behaviors of ions on the sampling interface was very important. The measurement equipment of kinetic temperature and terminal velocity of various particles after the sampling cone of ICP-MS was established based on the Doppler frequency shift and high resolution laser induced fluorescence technologies. It was defined that the maximum fluorescence response intersection of calcium ion between horizontal and vertical directions was the zero point of calibration. The changes of terminal velocity and kinetic temperature of argon atom and calcium ion were calculated and compared. The results showed that the terminal velocity of calcium ion on vertical and horizontal directions of plasma torch tube was higher than that of neutral argon atom, indicating the acceleration of charged particle after sampling cone. The ambipolar diffusion in electric field and the acceleration of charged particles resulted in the more deviation from center axis of plasma. Therefore, it was more difficult to reach the skimmer cone. The experimental results could provide data support for the calculation of transmission efficiency on sampling interface and the development of related simulation model.
马海斌, 孙自杰. 电感耦合等离子体质谱仪中氩原子和钙离子的动力学温度及终端移动速率测量[J]. 冶金分析, 2015, 35(8): 7-11.
MA Hai-bin, SUN Zi-jie. Measurement of kinetic temperature and terminal velocity for argon atom and calcium ionin inductively coupled plasma mass spectrometry. , 2015, 35(8): 7-11.
金献忠,谢健梅,张建波,等. 氩气氛围电感耦合等离子体质谱分析性能的初步研究和应用[J]. 冶金分析,2014, 34(10):7-13.JIN Xian-zhong, XIE Jian-mei, ZHANG Jian-bo, et al. Preliminary study and application on inductively coupled plasma mass spectrometry with ambient argon surrounding ion source[J]. Metallurgical Analysis,2014,34(10):7-13
[2]
王铁,亢德华,于媛君.电感耦合等离子体质谱法测定锰铁中痕量铅锡锑[J].冶金分析, 2013, 33(5): 13-16.WANG Tie, KANG De-hua, YU Yuan-jun. Determination of trace lead, tin and antimony in ferromanganese by inductively coupled plasma mass spectrometry[J]. Metallurgical Analysis, 2013,33(5):13-16
[3]
Stewart I I, Olesik J W. Time-resolved measurements with single droplet introduction to investigate space-charge effects in plasma mass spectrometry[J]. Journal of the American Society for Mass Spectrometry, 1999, 10(2): 159-174.
[4]
Lehn S A, Warner K A, Huang M, et al. Effect of sample matrix on the fundamental properties of the inductively coupled plasma[J]. Spectrochimica Acta Part B:Atomic Spectroscopy, 2003, 58(10):1785-1806.
[5]
Olsen J B, Macedone J H, Farnsworth P B. Source gas kinetic temperature in an ICP-MS determined by measurements of the gas velocities in the first vacuum stage [J]. Journal of Analytical Atomic Spectrometry, 2006, 21: 856-860.
[6]
Chambers D M, Poehlman J, Yang P, et al. Fundamental studies of the sampling process in an inductively coupled plasma mass spectrometer - I:Langmuir probe measurements[J]. Spectrochimica Acta Part B:Atomic Spectroscopy,1991, 46(6-7): 741-760.
[7]
Macedone J H, Farnsworth P B. Changes in plasma composition during the expansion into the first vacuum stage of an inductively coupled plasma mass spectrometer[J]. Spectrochimica Acta Part B:Atomic Spectroscopy,2006, 61(9): 1031-1038.
[8]
Taylor N, Farnsworth P B. Experimental characterization of the effect of skimmer cone design on shock formation and ion transmission efficiency in the vacuum interface of an inductively coupled plasma mass spectrometer [J]. Spectrochimica Acta Part B:Atomic Spectroscopy, 2012, 69: 2-8.
[9]
Radicic W N, Olsen J B, Neilson R V, et al. Characterization of the supersonic expansion in the vacuum interface of an inductively coupled plasma mass spectrometer by high-resolution diode laser spectroscopy [J]. Spectrochimica Acta Part B:Atomic Spectroscopy, 2006, 61(6): 686-695.
[10]
Ma H. Ion transport behaviors upstream and downstream from the sampling cone of an inductively coupled plasma mass spectrometer[D].Utah: Brigham Young University, 2009: 79-94.
[11]
Montaser A, Golightly D W. Inductively coupled plasmas in analytical atomic spectrometry[M]. 2nd. New York: VCH Publisher Inc., 1992: 35-40.
[12]
Macedone J H, Mills A A, Farnsworth P B. Optical measurements of ion trajectories through the vacuum interface of an inductively coupled plasma mass spectrometer[J]. Applied Spectroscopy, 2004, 58(4): 463-467.
[13]
Spencer R L, Taylor N, Farnsworth P B. Comparison of calculated and experimental flow velocities upstream from the sampling cone of an inductively coupled plasma mass spectrometer[J]. Spectrochimica Acta Part B:Atomic Spectroscopy, 2009, 64(9):921-924.
