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通过远程液化方案开发一种无冷的低温扫描探头显微镜

Ruisong Ma¹, Hao Li², Chenshuai Shi²

¹Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, China.

The Review of scientific instruments

|September 6, 2023

概括

一个新的无冷物冷却系统可以达到低于3K的温度,具有用于扫描探针显微镜 (SPM) 的超低振动. 这种新的设计采用远程液化,为传统的冷静装置提供无振动的替代方案.

科学领域:

物理物理学物理
材料科学材料科学材料科学
低温生化技术 (Cryogenics) 是一个非常重要的技术.

背景情况:

传统的低温扫描探针显微镜 (SPM) 常常依赖于浴室的冷静态,它可以引入振动.
达到低于3凯尔文的温度通常需要复杂且易受振动的冷装置.

研究的目的:

为SPM系统开发一种无冷冷却方案,以实现超低振动的低于3K的温度.
为了证明这个新系统的性能和多功能性,用于各种SPM技术.

主要方法:

将Gifford-McMahon冷器集成到一个单独的液化室中,用于远程冷却.
使用连接通过灵活的传输线进行样本冷却的连续流冷却器.
实施一个闭环气体系统,用于连续的重液化和转移.

主要成果:

在扫描仪样本阶段达到约2.84K的基温.
在4K时的温度稳定性在±0.1mK以内,表明超低振动.
通过各种表征技术,通过各种表征技术,通过各种表征技术验证了与基于浴室冷静机的SPM系统相比较的性能.

结论:

开发的无冷物质的SPM系统为低温测量提供了一个方便且可升级的解决方案.
远程液化方案与其他实验环境兼容,例如高磁场和光学接入.
这项技术在各种需要低温和最小振动的冷场中具有潜在的应用.

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Cryo-electron Microscopy

Cryo-electron Microscopy

Conventional electron microscopy (EM) involves dehydration, fixation, and staining of biological samples, which distorts the native state of biological molecules and results in several artifacts. Also, the high-energy electron beam damages the sample and makes it difficult to obtain high-resolution images. These issues can be addressed using cryo-EM, which uses frozen samples and gentler electron beams. The technique was developed by Jacques Dubochet, Joachim Frank, and Richard Henderson, for...