03/19/2025, 03:02 PM UTC
超越原子钟：迈向核钟的研究进展Stepping beyond atomic clocks
➀ JILA和维也纳科技大学的研究人员发现了一种具有低温度系数的钍原子核共振模式，这可能是国家级频率标准中原子振荡器的替代品。
➁ 优选的同位素是229mTh，它具有紫外线中的核共振，可以通过激光访问。
➂ 研究小组发现了一种几乎抵消效应的跃迁，在整个测量范围内仅偏移62kHz，显示出在精密计时中的巨大潜力。
➀ Researchers at JILA and the Technical University of Vienna have discovered a resonant mode in thorium atom nuclei with a low temperature coefficient, which could be a replacement for atomic oscillators in national-level frequency standards.
➁ The preferred isotope is 229mTh, which has nuclear resonances in the ultraviolet, accessible by lasers.
➂ The team found a transition with almost cancelled effects, shifting only 62kHz across the measurement range, showing great promise for precision timekeeping.
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