论文标题
HD分子中的超细结构
Hyperfine structure in the HD molecule
论文作者
论文摘要
我们研究了HD分子的电子基态中质子自旋，杜特龙自旋和轨道角动量之间的相互作用。这些相互作用导致分子能级的超细分裂。我们对第一轮旋转水平的数值结果与1950年代Ramsey {\ em等人}进行的当前最准确的测量非常吻合。对于精确确定光谱测量中的旋转式过渡能是必要的。我们提供理论预测并共享用于执行数值计算的数值代码。这项工作为分子系统中高精细相互作用的高精度光谱测试奠定了基础。特别是，我们确定迪特隆四极力矩$ q = 0.2856（2）$ fm $^2 $的价值，并给出了将其准确性提高三个数量级的前景。
We investigate interactions between the proton spin, the deuteron spin, and the orbital angular momentum in the electronic ground state of the HD molecule. These interactions lead to hyperfine splittings of molecular energy levels. Our numerical results for the first rotational level agree well with the currently most accurate measurement performed by Ramsey {\em et al.} in the 1950s. Knowledge of the hyperfine structure of other levels is necessary for the accurate determination of rovibrational transition energies in spectroscopic measurements. We present theoretical predictions and share the numerical code used to perform numerical calculations. This work sets the ground for high precision spectroscopic tests of hyperfine interactions in molecular systems. In particular we determine the value of the deuteron quadrupole moment $Q = 0.2856(2)$ fm$^2$ and give outlook for improving its accuracy by three orders of magnitude.
