论文标题
从$ 2^{3 \！} p_2 $状态到$ 5^{1 \！} d_2 $，$ 5^{3 \！} s_1 $和$ 5^{3 \！} d $ State d $ yustracold氦气中的频率测量
Frequency measurements of transitions from the $2^{3\!}P_2$ state to the $5^{1\!}D_2$, $5^{3\!}S_1$, and $5^{3\!}D$ states in ultracold helium
论文作者
论文摘要
我们使用Ultracold $^4 $ He原子执行激光吸收光谱，以测量$ 2^{3 \！} P_2 $级别和n = 5歧管中的五个级别之间的能量间隔。激光在生产Bose-Einstein凝结过程中散发出冷原子云并降低相空间密度，从而导致最终冷凝物中原子数的可测量减少。我们至少通过一个数量级提高了先前测量的精度，并报告了对旋转的$ 2^{3 \！} p_2-5^{1 \！} d_2 $ in Helium中的首次观察。理论过渡能与我们实验不确定性中观察到的值一致。
We perform laser absorption spectroscopy with ultracold $^4$He atoms to measure the energy intervals between the $2^{3\!} P_2$ level and five levels in the n = 5 manifold. The laser light perturbs the cold atomic cloud during the production of Bose-Einstein condensates and decreases the phase space density, causing a measurable decrease in the number of atoms in the final condensate. We improve on the precision of previous measurements by at least an order of magnitude, and report the first observation of the spin-forbidden $2^{3\!}P_2 - 5^{1\!}D_2$ transition in helium. Theoretical transition energies agree with the observed values within our experimental uncertainty.
