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  The ν6 fundamental frequency of the à state of formaldehyde and Coriolis perturbations in the 3ν4 level.

Park, B. G., Krüger, B. C., Meyer, S., Schwarzer, D., & Schäfer, T. (2016). The ν6 fundamental frequency of the à state of formaldehyde and Coriolis perturbations in the 3ν4 level. Journal of Chemical Physics, 144(19): 194308. doi:10.1063/1.4948635.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-F35F-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-098F-1
Genre: Journal Article

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Park, B. G.1, Author              
Krüger, B. C., Author
Meyer, S., Author
Schwarzer, D.1, Author              
Schäfer, T., Author
Affiliations:
1Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society, ou_578600              

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Free keywords: Coriolis effects; Manifolds; Rotation constants; Fluorescence; Laser induced fluorescence
 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 (A) over tilde (1)A(2) electronic state, the analogous Coriolis interaction does not occur, because the (A) over tilde 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 such a great extent in the (A) over tilde state that it is the 3 nu'(4) overtone which is near degenerate with nu'(6). In the current work, we report the precise nu'(6) fundamental frequency in the (A) over tilde state, and we determine the strength of the a-axis Coriolis interaction between 3 nu'(4) and nu'(6). We also provide a rotational analysis of the nu'(4) + nu'(6) combination band, which interacts with 3 nu'(4) via an additional c-axis Coriolis perturbation, and which allows us to provide a complete deperturbed fit to the 3 nu'(4) rotational structure. Knowledge of the Coriolis interaction strengths among the lowest-lying levels in the (A) over tilde state will aid the interpretation of the spectroscopy and dynamics of many higher-lying band structures, which are perturbed by analogous interactions.

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Language(s): eng - English
 Dates: 2016-05-182016-05-21
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1063/1.4948635
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Title: Journal of Chemical Physics
Source Genre: Journal
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Pages: 9 Volume / Issue: 144 (19) Sequence Number: 194308 Start / End Page: - Identifier: -