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 Title: CORIOLIS PERTURBATIONS TO THE 3ν4 LEVEL OF THE A STATE OF FORMALDEHYDE Author(s): Park, Barratt Contributor(s): Schaefer, Tim; Meyer, Sven; Krueger, Bastian C. Subject(s): Small molecules Abstract: Formaldehyde is the smallest stable organic molecule containing the carbonyl functional group, and is commonly considered to be a prototype for the study of high-resolution spectroscopy of polyatomic molecules. The $a$-axis Coriolis interaction between the near-degenerate $nu_4$ and $nu_6$ (out-of-plane and in-plane wagging modes, respectively) of the ground electronic state has received extensive attention and is thoroughly understood. In the first excited singlet $mathrm{tilde{A}}$ $^1$A$_2$ electronic state, the analogous Coriolis interaction does not occur, because the $mathrm{tilde{A}}$ state suffers from a pseudo Jahn-Teller distortion, which causes a double-well potential energy structure in the $q_4'$ out-of-plane coordinate, and which dramatically reduces the effective $nu_4'$ frequency. The $nu_4'$ frequency is reduced by so great an extent in the $mathrm{tilde{A}}$ state that it is the $3nu_4'$ overtone which is near degenerate with $nu_6'$. In the current work, we report the precise $nu_6'$ fundamental frequency in the $mathrm{tilde{A}}$ state, and we determine the strength of the $a$-axis Coriolis interaction between $3nu_4'$ and $nu_6'$. We also provide a rotational analysis of the $nu_4'+nu_6'$ combination band, which interacts with $3nu_4'$ via an additional $c$-axis Coriolis perturbation, and which allows us to provide a complete deperturbed fit to the $3nu_4'$ rotational structure. Knowledge of the Coriolis interaction strengths among the lowest-lying levels in the $mathrm{tilde{A}}$ state will aid the interpretation of the spectroscopy and dynamics of many higher-lying band structures, which are perturbed by analogous interactions. Issue Date: 6/20/2017 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/96867 DOI: 10.15278/isms.2017.TK02 Date Available in IDEALS: 2017-07-27
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