Kruzins A, Alps K, Docenko O, Klincare I, Tamanis M, Ferber R, Pazyuk E A, Stolyarov A V
Laser Center, University of Latvia, 19 Rainis Boulevard, Riga LV-1586, Latvia.
Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Leninskie gory 1/3, Russia.
J Chem Phys. 2014 Nov 14;141(18):184309. doi: 10.1063/1.4901327.
The article presents a study of the strongly spin-orbit coupled singlet A(1)Σ(+) and triplet b(3)Π states of the RbCs molecule, which provide an efficient optical path to transfer ultracold molecules to their rovibrational ground state. Fourier-transform A(1)Σ(+) - b(3)Π → X(1)Σ(+) and (4)(1)Σ(+) → A(1)Σ(+) - b(3)Π laser-induced fluorescence (LIF) spectra were recorded for the natural mixture of the (85)Rb(133)Cs and (87)Rb(133)Cs isotopologues produced in a heat pipe oven. Overall 8730 rovibronic term values of A(1)Σ(+) and b(3)Π states were determined with an uncertainty of 0.01 cm(-1) in the energy range [9012, 14087] cm(-1), covering rotational quantum numbers J ∈ [6, 324]. An energy-based deperturbation analysis performed in the framework of the four A(1)Σ(+) - b(3)Π(Ω = 0, 1, 2) coupled-channels approach reproduces 97% of the experimental term values of both isotopologues with a standard deviation of 0.0036 cm(-1). The reliability of the deperturbed mass-invariant potentials and spin-orbit coupling functions of the interacting A(1)Σ(+) and b(3)Π states is additionally proved by a good reproduction of the A - b → X and (4)(1)Σ(+) → A - b relative intensity distributions. The achieved accuracy of the A - b complex description allowed us to use the latter to assign the observed (5)(1)Σ(+) → A - b and (3)(1)Π → A - b transitions. As is demonstrated, LIF to the A - b complex becomes as informative as to the ground X(1)Σ(+) state, which is confirmed by comparing the results of (4)(1)Σ(+) state analysis based on (4)(1)Σ(+) → A - b LIF with the data from V. Zuters et al. [Phys. Rev. A 87, 022504 (2013)] based on (4)(1)Σ(+) → X LIF.
本文介绍了对RbCs分子的强自旋 - 轨道耦合单重态A(1)Σ(+)和三重态b(3)Π态的研究，这些态提供了一条将超冷分子转移到其振转基态的有效光路。记录了在热管炉中产生的(85)Rb(133)Cs和(87)Rb(133)Cs同位素异构体天然混合物的傅里叶变换A(1)Σ(+) - b(3)Π → X(1)Σ(+)和(4)(1)Σ(+) → A(1)Σ(+) - b(3)Π激光诱导荧光（LIF）光谱。在[9012, 14087]cm(-1)能量范围内，确定了A(1)Σ(+)和b(3)Π态的总共8730个振转项值，能量不确定度为0.01 cm(-1)，涵盖转动量子数J ∈ [6, 324]。在四个A(1)Σ(+) - b(3)Π(Ω = 0, 1, 2)耦合通道方法框架内进行的基于能量的去微扰分析，再现了两种同位素异构体97%的实验项值，标准偏差为0.0036 cm(-1)。相互作用的A(1)Σ(+)和b(3)Π态的去微扰质量不变势和自旋 - 轨道耦合函数的可靠性，通过A - b → X和(4)(1)Σ(+) → A - b相对强度分布的良好再现得到了进一步证明。A - b复合体描述所达到的精度使我们能够用它来指定观测到的(5)(1)Σ(+) → A - b和(3)(1)Π → A - b跃迁。如所证明的，向A - b复合体的LIF变得与向基态X(1)Σ(+)的LIF一样具有信息量，这通过比较基于(4)(1)Σ(+) → A - b LIF的(4)(1)Σ(+)态分析结果与V. Zuters等人[《物理评论A》87, 022504 (2013)]基于(4)(1)Σ(+) → X LIF的数据得到了证实。
