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arXiv physics/0601054physics.atom-phphysics.gen-ph
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约束精细结构常数演化的冷分子光谱学

Cold Molecule Spectroscopy for Constraining the Evolution of the Fine Structure Constant

Eric R. Hudson, H. J. Lewandowski, Brian C. Sawyer, Jun Ye

摘要:

我们报告精确测量的基态,$λ$的双峰微波跃迁的羟基自由基分子(OH)。利用斯塔克减速器产生的慢冷分子,我们将F' = 2 $\to$ F = 2跃迁的测量精度提高了25倍,(1 667 358 996 $\pm$ 4)Hz,而对于F' = 1 $\to$ F = 1跃迁,则增加10倍,得到(1 665 401 803 $\pm$ 12)Hz。将这些实验室频率与星际空间OH超脉泽的频率进行比较,将使$Δα/α$在$\sim$ $10^{10}$年内的灵敏度为1 ppm。

英文摘要:

We report precise measurements of ground-state, $λ$-doublet microwave transitions in the hydroxyl radical molecule (OH). Utilizing slow, cold molecules produced by a Stark decelerator we have improved over the precision of the previous best measurement by twenty-five-fold for the F' = 2 $\to$ F = 2 transition, yielding (1 667 358 996 $\pm$ 4) Hz, and by ten-fold for the F' = 1 $\to$ F = 1 transition, yielding (1 665 401 803 $\pm$ 12) Hz. Comparing these laboratory frequencies to those from OH megamasers in interstellar space will allow a sensitivity of 1 ppm for $Δα/α$ over $\sim$$10^{10}$ years.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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