A test of capillary array beam sources for very large Knudsen numbers |
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| Affiliation: | 1. Research Center for Functional Materials, National Institute for Material Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan;2. Graduate School of Science and Technology, Shinshu University, Nagano 390-8621, Japan;3. International Center for Materials Nanoarchitetonics, National Institute for Material Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan;1. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;2. Evidence Based Medicine Center, School of Basic Medical Science of Lanzhou University, Lanzhou 730000, China;3. Key Laboratory of Evidence Based Medicine and Knowledge Translation of Gansu Province, Lanzhou 730000, China;4. Department of Computational Physics, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;5. The Key Laboratory of Biomedical Information Engineering of Ministry of Education, National Engineering Research Center of Health Care and Medical Devices, The Key Laboratory of Neuro-informatics & Rehabilitation Engineering of Ministry of Civil Affairs, and Institute of Health and Rehabilitation Science, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China.;6. School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ 85287, USA;7. Department of Physics, Arizona State University, Tempe, AZ 85287, USA |
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| Abstract: | An experimental test of the angular distribution function of particles originating from long capillaries has been performed. Gas pressures at the tube entrance corresponding to Knudsen numbers of 103–105 were used. The results can be described very well by the elementary Clausing theory. The cosine law for gas reflection inside the tubes is fulfilled with high accuracy. No differences in the behaviour of CO, CO2, N2 and O2 could be detected. The investigation is also considered to be an accurate test of the simple beam detector used in the investigation. |
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