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Chinese Physics C> 1999, Vol. 23> Issue(3) : 244-249 

Measurement of the Transmission Efficiency of He-Jet Laser Time-of-Flight Mass Spectrometer

  •  Department of Physics, Tsinghua University, Beijing 1000841 Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000

  • A He-jet laser bine-of-flight (TOF) mass spectrometer system is built. The sample atoms evaporated in the atomization chamber are used to simulate the reaction products. The sample atoms are transferred by helitim gas trough a thin capillary.After passing through a skimmer, the sample atoms are formed into a neutral atom stream.A two-or three-color laser beams perpendicular to the atom jet is used to excite and ionize the atomes multi-steply. Then a pulsed electrical field pulls the ionized atoms to the TOF mass spectrometer. By this processing, the (Z, A) values of the sample atoms can be determined precisely. The efficiency of the spectrometer is studied by measuring the radioactivity of 24Na atoms. The transmission efficiency consists of two parts, the transportation efficiency and the efficiency of laser resonance ionization. The transportation efficiency is determined to be about 17%.
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    [1] Detraz C, Vieria D Ann. Rev Nucl. Sc, 19892 Xu Sida, Shang Rencheng. Progress of Physics(in Chinese), 1991, 11(1):53–82(徐四大,尚仁成.物理学进展,1991,11(1):53–82)3 Shang Rencheng. A Conceptual Design for a Laser Spectroscopy Setup on the HIRFL. In: Shen ,W Q, Luo Y X,Liu J Y ed.International Symposium On Heavy Ion Physics and Application . Singapore:World Scientific,1990. 479–492 4 Shang Rencheng,Xu Sida, Zhang Wei et al.Rev Sci Instrum, 1997,68(8):30275 Aysto J, Valli K. Nucl. Instrum. Methods,1973,112:531

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Cheng Hongxing, Pang Wenning, Shang Rencheng, Zhang Wei, Ta La, Xiao Yuan, Xu Sida, Zhao Zhizheng and Luo Yixiao. Measurement of the Transmission Efficiency of He-Jet Laser Time-of-Flight Mass Spectrometer[J]. Chinese Physics C, 1999, 23(3): 244-249.
Cheng Hongxing, Pang Wenning, Shang Rencheng, Zhang Wei, Ta La, Xiao Yuan, Xu Sida, Zhao Zhizheng and Luo Yixiao. Measurement of the Transmission Efficiency of He-Jet Laser Time-of-Flight Mass Spectrometer[J]. Chinese Physics C, 1999, 23(3): 244-249. shu
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Received: 1998-02-09
Revised: 1900-01-01
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Measurement of the Transmission Efficiency of He-Jet Laser Time-of-Flight Mass Spectrometer

    Corresponding author: Cheng Hongxing,
  • Department of Physics, Tsinghua University, Beijing 1000841 Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000
  • Received Date: 1998-02-09
  • Accepted Date: 1900-01-01
  • Available Online: 1999-03-05

Abstract: A He-jet laser bine-of-flight (TOF) mass spectrometer system is built. The sample atoms evaporated in the atomization chamber are used to simulate the reaction products. The sample atoms are transferred by helitim gas trough a thin capillary.After passing through a skimmer, the sample atoms are formed into a neutral atom stream.A two-or three-color laser beams perpendicular to the atom jet is used to excite and ionize the atomes multi-steply. Then a pulsed electrical field pulls the ionized atoms to the TOF mass spectrometer. By this processing, the (Z, A) values of the sample atoms can be determined precisely. The efficiency of the spectrometer is studied by measuring the radioactivity of 24Na atoms. The transmission efficiency consists of two parts, the transportation efficiency and the efficiency of laser resonance ionization. The transportation efficiency is determined to be about 17%.

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