Lackner Florian, Krois Günter, Buchsteiner Thomas, Pototschnig Johann V, Ernst Wolfgang E
Institute of Experimental Physics, TU Graz, Petersgasse 16, A-8010 Graz, Austria.
Phys Rev Lett. 2014 Oct 10;113(15):153001. doi: 10.1103/PhysRevLett.113.153001. Epub 2014 Oct 6.
We present a combined experimental and theoretical study of the RbSr molecule. The experimental approach is based on the formation of RbSr molecules on helium nanodroplets. Utilizing two-photon ionization spectroscopy, an excitation spectrum ranging from 11,600 up to 23,000 cm(-1) was recorded. High level ab initio calculations of potential energy curves and transition dipole moments accompany the experiment and facilitate an assignment of transitions. We show that RbSr molecules desorb from the helium droplets upon excitation, which enables dispersed fluorescence spectroscopy of free RbSr. These spectra elucidate X(2)Σ(+) ground and excited state properties. Emission spectra originating from states corresponding to the Rb(5s(2)S) + Sr(5s5p(3)P) asymptote were recorded; spin-orbit coupling was included for the simulation. The results should provide a good basis for achieving the formation of this molecule in cold collisions, thus offering intriguing prospects for ultracold molecular physics.
我们展示了一项关于铷锶分子的实验与理论相结合的研究。实验方法基于在氦纳米液滴上形成铷锶分子。利用双光子电离光谱，记录了范围从11,600至23,000厘米⁻¹的激发光谱。高水平的势能曲线和跃迁偶极矩的从头算伴随实验进行，并有助于对跃迁进行归属。我们表明，铷锶分子在激发时从氦液滴上解吸，这使得能够对自由的铷锶进行分散荧光光谱研究。这些光谱阐明了X(2)Σ⁺基态和激发态的性质。记录了源自对应于铷(5s²S) + 锶(5s5p³P)渐近线的态的发射光谱；模拟中考虑了自旋 - 轨道耦合。这些结果应为在冷碰撞中实现该分子的形成提供良好基础，从而为超冷分子物理学带来有趣的前景。
