Simple, reliable, and nondestructive method for the measurement of vacuum pressure without specialized equipment.
Simple, reliable, and nondestructive method for the measurement of vacuum pressure without specialized equipment.
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DOI：
10.1364/ao.52.006195
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发表时间：
2013-09
期刊：
影响因子：
1.9
通讯作者：
Jinpeng Yuan;Zhonghua Ji;Yanting Zhao;Xuefang Chang;Liantuan Xiao;S. Jia
中科院分区：
文献类型：
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作者：
Jinpeng Yuan;Zhonghua Ji;Yanting Zhao;Xuefang Chang;Liantuan Xiao;S. Jia
提出了一种简单、可靠、无损的测量磁光陷阱真空压力的方法。证明了真空压力与冷原子与背景气体的碰撞速率常数成正比，系数为k，可用简单的理想气体定律计算。根据冷原子在不同俘获激光强度下的一系列加载曲线，可由总碰撞损失率推导出与所有背景气体碰撞损失的速率常数。该方法也适用于其他冷原子系统，满足了商业应用的小型化要求。
We present a simple, reliable, and nondestructive method for the measurement of vacuum pressure in a magneto-optical trap. The vacuum pressure is verified to be proportional to the collision rate constant between cold atoms and the background gas with a coefficient k, which can be calculated by means of the simple ideal gas law. The rate constant for loss due to collisions with all background gases can be derived from the total collision loss rate by a series of loading curves of cold atoms under different trapping laser intensities. The presented method is also applicable for other cold atomic systems and meets the miniaturization requirement of commercial applications.