论文标题
$^7 $ li $^+$ - $^7 $ li ion-atom系统的交互潜力和超低散射横截面
Interaction potentials and ultracold scattering cross sections for the $^7$Li$^+$-$^7$Li ion-atom system
论文作者
论文摘要
我们计算电子接地和第一个激发态的同位素独立的LI $^+$ - LI势能曲线。计算$^7 $ li $^+$ - $^7 $ li碰撞的散射相移和总散射横截面，重点放在超低的能源域，直到$ s $ - 波浪制度。出于物理动机的改变对计算的势能曲线的影响用于确定离子原子系统低能散射参数准确性的结合。发现A $^2σ_U^+$状态的散射长度，$ a_u $ = 1325 A $ _0 $是正的，并且具有良好的约束界限。对于x $^2σ_g^+$状态，散射长度，$ a_g $ = 20465 a $ _0 $具有很大的幅度，因为它对电势的约束变化很敏感，这是由于离解限制的附近存在振动状态。
We calculate the isotope independent Li$^+$-Li potential energy curves for the electronic ground and first excited states. Scattering phase shifts and total scattering cross section for the $^7$Li$^+$-$^7$Li collision are calculated with emphasis on the ultra-low energy domain down to the $s$-wave regime. The effect of physically motivated alterations on the calculated potential energy curves is used to determine the bound of accuracy of the low-energy scattering parameters for the ion-atom system. It is found that the scattering length for the A$^2Σ_u^+$ state, $a_u$ = 1325 a$_0$, is positive and has well-constrained bounds. For the X$^2Σ_g^+$ state, the scattering length, $a_g$ = 20465 a$_0$ has a large magnitude as it is sensitive to the restrained change of the potential, due to the presence of a vibrational state in the vicinity of the dissociation limit.
