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 Title: Gateway States Of The 12∆ State Of Cah. Author(s): Kobayashi, Kaori Contributor(s): Ross, Stephen Cary; Moriwaki, Yoshiki; Furuta, Jin; Yaguramaki, Shota Subject(s): Radicals Abstract: Calcium monohydride CaH is found in the Sun and other stars. Indeed, its A-X electronic spectrum has been a useful probe for stellar classification.\footnote{For example, J.E. Gizis, \textit{Astron. J.} \underline{\textbf{113}}, 806 (1997).} We have been working on this molecule in the visible and ultraviolet regions. Using Laser Induced Fluorescence (LIF) we have identified many new vibrational levels of the A, B/B$'$, and $1^2\Delta$ states. Our primary interest has been the detailed investigation of the B/B$'$ state which has a double-minimum potential energy function. We have previously studied vibrational levels lying both below and above the potential energy barrier between the two wells.\footnote{K. Watanabe, N. Yoneyama, K. Uchida, K. Kobayashi, F. Matsushima, Y. Moriwaki, S. C. Ross, \textit{Chem. Phys. Lett.} \underline{\textbf{657}}, 1 (2016).}$^,$\footnote{K. Watanabe, I. Tani, K. Kobayashi, Y. Moriwaki, S. C. Ross, \textit{Chem. Phys. Lett.} \underline{\textbf{710}}, 11 (2018).} In that work, we were able to confirm the strong irregularity in the vibrational energy spacings that had been predicted by the quantum chemical study of Carlsund-Levin \textit{et al}.\footnote{C. Carlsund-Levin, N. Elander, A. Nunez, A. Scrinzi, \textit{Phys. Scripta} \underline{\textbf{65}}, 306 (2002).} We previously reported the first experimental observation of the direct, but forbidden, excitation $1^2\Delta \leftarrow$X$^2\Sigma$.\footnote{J. Furuta, K. Watanabe, I. Tani, K. Kobayashi, Y. Moriwaki, S. C. Ross, \textit{74th International Symposium on Molecular Spectroscopy}, \textbf{TI06}, (2019).} This was done using LIF. This excitation is possible due to interaction of levels of the $1^2\Delta$ state with nearby levels of states for which excitation from the ground state is not forbidden, so called gateway'' states. By studying the ensuing relaxation from the $1^2\Delta$ state we have now identified some of the gateway levels involved. Issue Date: 2021-06-23 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111022 Date Available in IDEALS: 2021-09-24
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