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Issue 37, 2011
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Conformationally resolved structures of jet-cooled acetaminophen by UV–UV hole-burning spectroscopy

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Abstract

The conformational structures of jet-cooled acetaminophen were investigated in the gas phase by resonant 2-photon ionization and UV–UV hole-burning spectroscopy. In contrast to the results from a previous study, two nearly isoenergetic conformers were distinctly found in a supersonic molecular beam expansion and positively identified as the cis and trans isomers of acetaminophen by UV–UV hole-burning spectroscopy. The 0–0 bands of the cis and trans isomers were found at 33518.7 and 33485.6 cm−1, respectively. The vibronic bands of the two isomers are close-lying and/or partially overlapping due to the small energy difference (33 cm−1) between the two 0–0 bands. As a consequence, the recorded resonant 2-photon ionization spectrum is highly congested in the low excitation energy region, which develops continuously into a featureless, broadened spectrum in the high energy region.

Graphical abstract: Conformationally resolved structures of jet-cooled acetaminophen by UV–UV hole-burning spectroscopy

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Publication details

The article was received on 18 Jun 2011, accepted on 29 Jul 2011 and first published on 18 Aug 2011


Article type: Communication
DOI: 10.1039/C1CP21999E
Citation: Phys. Chem. Chem. Phys., 2011,13, 16537-16541
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    Conformationally resolved structures of jet-cooled acetaminophen by UV–UV hole-burning spectroscopy

    S. J. Lee, A. Min, Y. Kim, A. Ahn, J. Chang, S. H. Lee, M. Y. Choi and S. K. Kim, Phys. Chem. Chem. Phys., 2011, 13, 16537
    DOI: 10.1039/C1CP21999E

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