钾离子基态散射参数和Born-Oppenheimer势的分子光谱研究
Potassium ground state scattering parameters and Born-Oppenheimer potentials from molecular spectroscopy
摘要：
我们提出了精确的测量与MHz的渐近和良好的束缚水平之间的能隙的电子基态X $^1Σ_{\mathrm{g}}^+$的$^{39}$ K $_2$分子的不确定性。在高度准直的粒子束中制备分子，并使用电子激发态A $^1Σ^+_{\rm u}$作为中间态，在接近基态的渐近线的光学跃迁到长程能级的$Λ$型激发方案中询问分子。通过与I $_2$线比较或使用fs频率梳绝对测量来测量跃迁频率。所确定的能级能量与来自其他作者报道的$^{39}$ K和$^{40}$ K的冷碰撞的费什巴赫共振一起用于拟合新的基态势。精确的散射长度的确定和测试的有效性的玻恩-奥本海默近似的描述冷碰撞在这个精度水平进行。
英文摘要：
We present precision measurements with MHz uncertainty of the energy gap between asymptotic and well bound levels in the electronic ground state X $^1Σ_{\mathrm{g}}^+$ of the $^{39}$K$_2$ molecule. The molecules are prepared in a highly collimated particle beam and are interrogated in a $Λ$-type excitation scheme of optical transitions to long range levels close to the asymptote of the ground state, using the electronically excited state A $^1Σ^+_{\rm u}$ as intermediate one. The transition frequencies are measured either by comparison with I$_2$ lines or by absolute measurements using a fs-frequency comb. The determined level energies were used together with Feshbach resonances from cold collisions of $^{39}$K and $^{40}$K reported from other authors to fit new ground state potentials. Precise scattering lengths are determined and tests of the validity of the Born-Oppenheimer approximation for the description of cold collisions at this level of precision are performed.
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