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  A 1 + 1' resonance-enhanced multiphoton ionization scheme for rotationally state-selective detection of formaldehyde via the à 1A2 ← X[combining tilde] 1A1 transition.

Park, G. B., Krüger, B. C., Meyer, S., Wodtke, A. M., & Schäfer, T. (2016). A 1 + 1' resonance-enhanced multiphoton ionization scheme for rotationally state-selective detection of formaldehyde via the à 1A2 ← X[combining tilde] 1A1 transition. Physical Chemistry Chemical Physics, 18(32), 22355-22363. doi:10.1039/c6cp03833f.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-127D-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-0AA0-D
Genre: Journal Article

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Park, G. B.1, Author              
Krüger, B. C.1, Author              
Meyer, S., Author
Wodtke, A. M.1, Author              
Schäfer, T.1, Author              
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1Department of Dynamics at Surfaces, MPI for Biophysical Chemistry, Max Planck Society, ou_578600              

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 Abstract: The formaldehyde molecule is an important model system for understanding dynamical processes in small polyatomic molecules. However, prior to this work, there have been no reports of a resonance-enhanced multiphoton ionization (REMPI) detection scheme for formaldehyde suitable for rovibrationally state-selective detection in molecular beam scattering experiments. Previously reported tunable REMPI schemes are either non-rotationally resolved, involve multiple resonant steps, or involve many-photon ionization steps. In the current work, we present a new 1 + 1' REMPI scheme for formaldehyde. The first photon is tunable and provides rotational resolution via the vibronically allowed à 1A2 ← X[combining tilde] 1A1 transition. Molecules are then directly ionized from the à state by one photon of 157 nm. The results indicate that the ionization cross section from the 41 vibrational level of the à state is independent of the rotational level used as intermediate, to within experimental uncertainty. The 1 + 1' REMPI intensities are therefore directly proportional to the à ← X[combining tilde] absorption intensities and can be used for quantitative measurement of X[combining tilde]-state population distributions.

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Language(s): eng - English
 Dates: 2016-07-202016-08-28
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1039/c6cp03833f
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Title: Physical Chemistry Chemical Physics
Source Genre: Journal
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Pages: - Volume / Issue: 18 (32) Sequence Number: - Start / End Page: 22355 - 22363 Identifier: -