论文标题
探测范德华的相互作用并通过rydberg原子在低于100 mk的温度下通过förster共振能量转移检测极性分子
Probing van der Waals interactions and detecting polar molecules by Förster resonance energy transfer with Rydberg atoms at temperatures below 100 mK
论文作者
论文摘要
电场控制的Förster共振能量转移（FRET）在Rydberg氦气（HE）原子和地下氨（NH $ _3 $）分子之间已在低于100 mk的转化温度下进行了研究。这些实验是在HE中用NH $ _3 $的脉冲超音速束的脉冲超音速束中进行的。一系列的Förster共振，在三胞胎瑞德伯格州之间，主量子数为38、39和40，并研究了NH $ _3 $的反转间隔。对于Rydberg-Rydberg的电动偶极转变矩3270D的Rydberg-Rydberg过渡，观察到共振宽度低至$ 100 \ pm20 $ MHz。这些宽度是由平均质量中心速度的二进制碰撞造成的，造成$ 19.3 \ pm2.6 $ m/s。对于最初制备的Rydberg状态的过渡，具有较大的静态电偶极矩，碰撞伙伴之间的范德华相互作用将共振宽度增加到$ \ sim750 $ MHz。从观察到的最狭窄共振的FRET速率的测量值中，NH $ _3 $的密度为$（9.4 \ pm0.3）\ times10^{9} $ cm $^{ - 3} $在地基状态反转的上层位置在设备的相互作用区域中的跨层次差异。
Electric-field-controlled Förster resonance energy transfer (FRET) between Rydberg helium (He) atoms and ground-state ammonia (NH$_3$) molecules has been studied at translational temperatures below 100 mK. The experiments were performed in an intrabeam collision apparatus with pulsed supersonic beams of NH$_3$ seeded in He. A range of Förster resonances, between triplet Rydberg states in He with principal quantum numbers of 38, 39 and 40, and the inversion intervals in NH$_3$ were investigated. Resonance widths as low as $100\pm20$ MHz were observed for Rydberg-Rydberg transitions with electric dipole transition moments of 3270 D. These widths result from binary collisions at a mean center-of-mass speed of $19.3\pm2.6$ m/s. For transitions in which the initially prepared Rydberg states were strongly polarized, with large induced static electric dipole moments, van der Waals interactions between the collision partners increased the resonance widths to $\sim750$ MHz. From measurements of the rate of FRET for the narrowest resonances observed, a density of NH$_3$ of $(9.4\pm0.3)\times10^{9}$ cm$^{-3}$ in the upper ground-state inversion sublevel in the interaction region of the apparatus was determined non-destructively.
