Uranium line list

Thorium hollow cathode lamps (HCLs) are used as frequency calibrators for many high resolution astronomical spectrographs, some of which aim for Doppler precision at the 1m/s...钍空心阴极灯（Thorium hollow cathode lamps, HCLs）被广泛用作众多高分辨率天文摄谱仪的频率校准器件，其中部分设备旨在实现1米/秒级别的多普勒测量精度。