Well, atomic hydrogen absorbs and emits radiation at certain frequencies: its atomic spectrum.

氢原子吸收并放射出特定频率的辐射，也就构成了它的原子光谱。

In this paper, we study the magnetron cavity used in atomic hydrogen maser.

本文对磁控管腔进行了试验研究.

The atomic hydrogen maser is the most stable frequency standard allshortest measuring time interval.

氢脉泽是一种中、长期稳定度最高的原子频率标准.

The atomic hydrogen maser is the most stable frequency standard generally available today for all but the shortest measuring time interval.

氢脉泽是一种中、长期稳定度最高的原子频率标准。

It begins with Maarten Schmidt who hypothesized that star formation rate (SFR) was related to the surface density of atomic hydrogen gas in the cloud.

最早是Maarten Schmidt猜测恒星形成率（SFR）与云层中氢原子气体密度有关。

But some scientists have disputed Clementine's radar data, and the anomalous neutron emissions observed by Lunar Prospector could have been caused by atomic hydrogen in the lunar soil instead of ice.

但是有些科学家却对克莱门蒂号的雷达观测资料存疑，此外月球探勘者号所观测到的中子异常放射，也有可能是来自于月球土壤中的氢原子而非冰层。