摘要：A principle to identify the material of a single particle without destroying the sample is examined by an experiment in microgravity ( μ G).Such an identification is important as a first stage of analyzing various grains of primitive materials.The identification was based on diamagnetic susceptibility χ DIA obtained from translation of the grain induced by a magnetic field.When a grain is released in an area of a monotonously decreasing field under μ G conditions, it will be ejected in the direction of the field reduction; here, the area is occupied with diffused gas medium.The material identification of a primitive grain is possible by comparing the measured χ DIA with published values; an intrinsic χ DIA value is assigned to a material according to a molecular orbital model.We report here that the ejection is realized for sub-mm-sized crystals of various organic and inorganic materials.By developing a short drop shaft ( μ G duration ~0.5 s), the proposed material identification can be easily performed in an ordinary chamber.Using conventional methods, χ DIA cannot be detected for a small sample of diameter below the level of a millimetre.The achieved result is a step to realize the identification of micron-sized grains that compose primitive materials. Key words Magnetic ejection chamber-type drop shaft graphite bismuth polyethylene.
关键词：Magnetic ejection ;chamber-type drop shaft ;graphite ;bismuth ;polyethylene
