标题： 氦的低激发三重态的动态偶极极化率 显示英文标题

标题： Dynamic dipole polarizabilities for the low-lying triplet states of helium

摘要： 氦的四个最低三重态（$2\,^3S$，$3\,^3S$，$2\,^3P$和$3\,^3P$）的动态偶极极化率使用 B-样条组态相互作用方法进行计算。长度、速度和加速度规范下的静态偶极极化率的当前值与最佳 Hylleraas 结果有很好的一致性。 同时，在400纳米到4.2~$\mu$米范围内识别出四个最低三重态的调谐波长，并在460~纳米到3.5~$\mu$米范围内确定了$2\,^3S \to 3\,^3S$、$2\,^3S \to 2\,^3P$和$2\,^3S \to 3\,^3P$跃迁的魔术波长。 我们表明$2\,^3S$状态的调谐波长为413.038 28(3)纳米，这证实了Mitroy和Tang（Phys. Rev.）的值。 A 88, 052515 (2013)), 并且对于$2\,^3S \to 3\,^3P$转换，在约 1066 nm 的魔法波长可以用于精确测量以确定转换矩阵元的比值$(2\,^3S \to 2\,^3P) / (3\,^3P\to 6\,^3S)$。 显示英文摘要

摘要： The dynamic dipole polarizabilities for the four lowest triplet states ($2\,^3S$, $3\,^3S$, $2\,^3P$ and $3\,^3P$) of helium are calculated using the B-spline configuration interaction method. Present values of the static dipole polarizabilities in the length, velocity and acceleration gauges are in good agreement with the best Hylleraas results. Also the tune-out wavelengths in the range from 400 nm to 4.2~$\mu$m for the four lowest triplet states are identified, and the magic wavelengths in the range from 460~nm to 3.5~$\mu$m for the $2\,^3S \to 3\,^3S$, $2\,^3S \to 2\,^3P$, and $2\,^3S \to 3\,^3P$ transitions are determined. We show that the tune-out wavelength of $2\,^3S$ state is 413.038 28(3) nm, which corroborates the value of Mitroy and Tang (Phys. Rev. A 88, 052515 (2013)), and the magic wavelength around 1066 nm for the $2\,^3S \to 3\,^3P$ transition can be expected for precision measurement to determine the ratio of transition matrix elements $(2\,^3S \to 2\,^3P) / (3\,^3P\to 6\,^3S)$.