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    National Tsing Hua University Institutional Repository > 理學院 > 化學系 > 期刊論文 >  Photodissociation Dynamics of 2,5-Dihydroxyacetophenone


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/56952


    Title: Photodissociation Dynamics of 2,5-Dihydroxyacetophenone
    Authors: Morisawa, Yusuke;Dyakov, Yuri A.;Tseng, Chien-Ming;Lee, Y. T.;Ni CK
    教師: 倪其焜
    Date: 2009
    Publisher: American Chemical Society
    Relation: Journal of Physical Chemistry a,American Chemical Society,Volume: 113,Issue: 1,Pages: 97-102,Published: JAN 8 2009
    Keywords: AROMATIC-MOLECULES
    DISSOCIATION
    PHENOL
    ACETOPHENONE
    MECHANISM
    BENZENE
    STATE
    MALDI
    Abstract: Photodissociation of 2,5-dihydroxyacetophenone (DHAP), an important matrix compound in matrix-assisted laser desorption/ionization (MALDI), was studied in a molecular beam at 193 nm using multimass ion imaging techniques. Two major dissociation channels were observed, including (1) C6H3(OH)(2)COCH3 -> OC6H3(OH)COCH3 + H and (2) C6H3(OH)(2)COCH3 -> C6H3(OH)(2) + COCH3. The minor channels include C6H(OH)(2)COCH3 -> C6H3(OH)(2)CO + CH3 and/or C6H3(OH)(2)COCH3 - C6H3(OH)(2) + CO + CH3. The photofragment translational energy distribution suggests that reaction I occurs at an excited state in which the potential along the O-H bond distance is repulsive. Comparison to the branching ratios from RRKM calculations suggests that reaction 2 does not occur at either the ground state or the triplet state or that if it does occur at one of these states it must not follow the RRKM-model. A comparison to the photodissociation dynamics of acetophenone and phenol and its derivatives was made.
    URI: http://pubs.acs.org/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/56952
    Appears in Collections:[化學系] 期刊論文

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