Estimation of diffusion rate of H_2O isotopes and evaluation of microparticle movement in ice samples.

为了估算冰样中H_2O同位素的扩散速率，我们研制了激光烧蚀和质谱相结合的仪器。设计并制作了用于冰样二维测量的样品室。该室用于样品烧蚀，分析，并通过开关阀真空。它与质谱仪连接，对烧蚀后的样品进行测量。在样品室中，用蒸发的液氮通过传导冷却约1pa的冰样品。对冰样表面的观测成功了三个多小时。蒸发后的样品可以传输到质谱仪，但存在检测同位素信号延迟的问题。

In order to estimate H_2O isotope diffusion rate in ice sample, we developed equipment that applied laser ablation technique and mass spectroscopy. We designed and made a sample chamber for two-dimensional measurement of ice sample. The chamber is used for sample ablation, analysis, and vacuum by switching valves. It is connected to mass-spectrometer and ablated sample is measured using it. In the sample chamber, an ice sample vacuumed around 1 Pa is cooled by conduction using evaporated liquid nitrogen. Observation of the ice sample surface is success more than three hours. Evaporated sample is able to transport to mass spectrometer, however delay to detect isotope signal is present problem.