The Magnetic Ordering of Graphite Grains and an Experimental Application to Grain Alignment
The Magnetic Ordering of Graphite Grains and an Experimental Application to Grain Alignment
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石墨晶粒的磁排序及其在晶粒排列中的实验应用
DOI：
10.1093/pasj/50.1.149
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发表时间：
1998
影响因子：
2.3
通讯作者：
T. Yamanaka
中科院分区：
文献类型：
--
作者：
H. Chihara;C. Uyeda;A. Tsuchiyama;T. Yamanaka
本文首次报道了微米级石墨样品中抗磁性晶粒取向的温度依赖性。提出了一种研究星际晶粒排列机理的实验方法。实验温度范围为室温~ 180 K，以乙醇为悬浮介质。当温度从室温降低到180 K时，全取向磁场从380 G减小到260 G。样品的平均直径为2.5±0.2 /zm和3.8±0.2 /zm，厚度为0.3±0.2 /zm。H$的温度依赖性与由悬浮粒子的玻尔兹曼分布理论导出的理论关系一致。在分子云等致密区域，应用传统的星际粒子排列理论还没有达到定量的一致性。讨论了应用抗磁或定向实验研究星际晶粒定向机理的可能性。本文所建立的观测晶粒走向的方法，可用于星光偏振机理的定量评价。
The temperature dependence of diamagnetic grain orientation is reported for the first time concerning micron-sized graphite samples. An experimental method was developed for the purpose of studying the mechanism of interstellar grain alignment. The experiment was carried out in the temperature range from room temperature to 180 K, using ethanol as the suspending medium. The field of full orientation H$ decreased from 380 G to 260 G as the temperature decreased from room temperature to 180 K. The average sizes of the samples were 2.5 ± 0.2 /zm and 3.8 ± 0.2 //m in diameter, and the thickness was 0.3 ± 0.2 /zm. This temperature dependence of H$ agrees with a theoretical relation, which was derived from the theory of the Boltzmann distribution of suspended particles. A quantitative consistency in applying the conventional theory on interstellar grain alignment has not yet been achieved for the dense region, such as molecular clouds. The possibility of applying a diamagnetic-or ientation experiment to the mechanism of interstellar grain alignment is discussed. The method for observing grain alignment established in the present work, can be applied for a quantitative evaluation of the star-light polarization mechanism.