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Issue 48, 2010
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Rotationally resolved spectroscopy and dynamics of the 3px1A2 Rydberg state of formaldehyde

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Abstract

The rotational structure of the lowest three vibrational levels (00, 61 and 41) of the 3px1A2 Rydberg state of formaldehyde has been studied by doubly-resonant three-photon ionization spectroscopy. A strong a-type Coriolis interaction between the in-plane rocking (ν6) and out-of-plane bending (ν4) modes results in the observation of vibronically forbidden transitions to the 61 level from the intermediate à 1A2 (21 43) level. The full widths at half maximum of the rovibronic transitions to the 41 state are considerably larger than to the vibrational ground state and the 61 level. The band origin (T0 = 67 728.939(82) cm−1), the rigid rotor rotational constants (A = 9.006(19) cm−1, B = 1.331(20) cm−1, and C = 1.135(22) cm−1), the Coriolis coupling constant (ξa4,6 = 8.86(89) cm−1) and the deperturbed fundamental wave numbers of both vibrational modes (6 = 808.88(25) cm−1 and 4 = 984.92(26) cm−1) have been determined for the 3px1A2 Rydberg state. Polarization effects originating from the double-resonance technique have been exploited to detect the Coriolis interaction and investigate how it affects the predissociation dynamics.

Graphical abstract: Rotationally resolved spectroscopy and dynamics of the 3px 1A2 Rydberg state of formaldehyde

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Article information


Submitted
12 Apr 2010
Accepted
15 May 2010
First published
23 Aug 2010

Phys. Chem. Chem. Phys., 2010,12, 15592-15599
Article type
Paper

Rotationally resolved spectroscopy and dynamics of the 3px1A2 Rydberg state of formaldehyde

M. Meisinger, A. M. Schulenburg, F. Merkt and P. P. Radi, Phys. Chem. Chem. Phys., 2010, 12, 15592
DOI: 10.1039/C0CP00191K

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