Department of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan.
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany.
J Chem Phys. 2018 Apr 14;148(14):144303. doi: 10.1063/1.5023633.
The protonated oxygen molecule, OH, and its helium complex, He-OH, have been investigated by vibrational action spectroscopy in a cryogenic 22-pole ion trap. For the He-OH complex, the frequencies of three vibrational bands have been determined by predissociation spectroscopy. The elusive OH has been characterized for the first time by high-resolution rovibrational spectroscopy via its ν OH-stretching band. Thirty-eight rovibrational fine structure transitions with partly resolved hyperfine satellites were measured (56 resolved lines in total). Spectroscopic parameters were determined by fitting the observed lines with an effective Hamiltonian for an asymmetric rotor in a triplet electronic ground state, X̃A, yielding a band origin at 3016.73 cm. Based on these spectroscopic parameters, the rotational spectrum is predicted, but not yet detected.
质子化氧分子 OH 和其氦复合物 He-OH 已在低温 22 极离子阱中通过振动作用光谱学进行了研究。对于 He-OH 复合物，通过预解离光谱学确定了三个振动带的频率。首次通过其 ν OH 伸缩带的高分辨率转动振动光谱学对难以捉摸的 OH 进行了表征。通过测量 38 个转动振动精细结构跃迁（总共 56 个分辨线）来实现（其中部分线有分辨的超精细卫星）。通过将观察到的线与三重态电子基态的不对称转子的有效哈密顿量拟合来确定光谱参数，得到的带原点为 3016.73 cm。基于这些光谱参数，预测了旋转光谱，但尚未检测到。
