美国国家标准研究所研 究人员认为,在新一代原子钟 中将利用锶原子。众所周知,现代铯原子钟走时误 差为每5000万年不超过1秒,铯原子钟工作建立在 测量铯原子辐射频率基础上,测量精度受原子热运 动和辐射波长的限制。锶原子辐射波长比铯原子辐 射波长短2个数量级,而最近发现的特性能快速使 锶气体冷却到接近绝对零度。在250毫微开温度时, 锶原子运动速度比步行者速度慢10倍,在这种状态 Researchers at the National Institute of Standards believe that strontium atoms will be utilized in a new generation of atomic clocks. It is well known that the error of travel time of modern cesium atomic clock is no more than 1 second every 50 million years. The work of cesium atomic clock is based on measuring the radiation frequency of cesium atom, and its measuring accuracy is limited by the thermal motion of the atom and the wavelength of radiation. The wavelength of strontium radiation is two orders of magnitude shorter than the wavelength of cesium atom radiation, and the recently discovered properties allow the strontium gas to rapidly cool to near absolute zero. In the 250-nanometer open temperature, strontium atom movement speed 10 times slower than pedestrians, in this state