High-resolution electronic spectra of yttrium oxide(YO)Ⅱ:spectroscopic study on the [33.2]2Π and A'2?5/2 states
作者单位：Hefei National Laboratory for Physical Sciences at the MicroscaleDepartment of Chemical PhysicsUniversity of Science and Technology of China
会议名称：《第十五届全国化学动力学会议》
会议日期：2017年
学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学]
关 键 词：YO laser induced fluorescence optical-optical double resonance
摘 要：The [33.2]Π and A’Δ electronic states of the astrophysically relevant yttrium oxide(YO) molecule have been experimentally studied at high resolution for the first time. The YO molecules are produced using the same method as in Part I of this work, i.e., by corona discharge of oxygen between the tips of two yttrium needles in a supersonic jet expansion. In this presentation, different spectroscopic detection schemes, including laser excitation spectroscopy, disperse fluorescence, optical-optical double resonance spectroscopy, and fluorescence depletion spectroscopy, are employed to identify the newly discovered [33.2]Π state, and to precisely measure the ro-vibrational energies of the A’Δ state. The AΠ state is used as the intermediate resonance state in the optical-optical double resonance experiment to reveal the spin-orbital coupling nature of the [33.2]Π state. To determine accurate spectroscopic constants of the ‘optically dark’ A’Δ state, a ‘pump-probe’ fluorescence depletion experiment is performed, where the newly discovered [33.2]Π state is used in the pump scheme.