Photodissociation dynamics of 2,5-dihydroxyacetophenone

Yusuke Morisawa; Yuri A. Dyakov; Chien-Ming Tseng; Y. T. Lee; Chi Kung Ni

doi:10.1021/jp806446z

Photodissociation dynamics of 2,5-dihydroxyacetophenone

Yusuke Morisawa, Yuri A. Dyakov, Chien-Ming Tseng, Y. T. Lee, Chi Kung Ni^*

^*Corresponding author for this work

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

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) C₆H ₃(OH)₂COCH₃ →^* OC ₆H₃(OH)COCH₃ + H and (2) C₆H ₃(OH)₂COCH₃ - C₆H ₃(OH)₂ + COCH₃. The minor channels include C₆H₃(OH)₂COCH₃ ← C ₆H₃(OH)₂CO + CH₃ and/or C ₆H₃(OH)₂COCH₃ → C ₆H₃(OH)₂ + CO + CH₃. The photofragment translational energy distribution suggests that reaction 1 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.

Original language	English
Pages (from-to)	97-102
Number of pages	6
Journal	Journal of Physical Chemistry A
Volume	113
Issue number	1
DOIs	https://doi.org/10.1021/jp806446z
State	Published - 8 Jan 2009

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title = "Photodissociation dynamics of 2,5-dihydroxyacetophenone",

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) C6H 3(OH)2COCH3 →* OC 6H3(OH)COCH3 + H and (2) C6H 3(OH)2COCH3 - C6H 3(OH)2 + COCH3. The minor channels include C6H3(OH)2COCH3 ← C 6H3(OH)2CO + CH3 and/or C 6H3(OH)2COCH3 → C 6H3(OH)2 + CO + CH3. The photofragment translational energy distribution suggests that reaction 1 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.",

author = "Yusuke Morisawa and Dyakov, {Yuri A.} and Chien-Ming Tseng and Lee, {Y. T.} and Ni, {Chi Kung}",

year = "2009",

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AU - Morisawa, Yusuke

AU - Dyakov, Yuri A.

AU - Tseng, Chien-Ming

AU - Lee, Y. T.

AU - Ni, Chi Kung

PY - 2009/1/8

Y1 - 2009/1/8

N2 - 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) C6H 3(OH)2COCH3 →* OC 6H3(OH)COCH3 + H and (2) C6H 3(OH)2COCH3 - C6H 3(OH)2 + COCH3. The minor channels include C6H3(OH)2COCH3 ← C 6H3(OH)2CO + CH3 and/or C 6H3(OH)2COCH3 → C 6H3(OH)2 + CO + CH3. The photofragment translational energy distribution suggests that reaction 1 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.

AB - 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) C6H 3(OH)2COCH3 →* OC 6H3(OH)COCH3 + H and (2) C6H 3(OH)2COCH3 - C6H 3(OH)2 + COCH3. The minor channels include C6H3(OH)2COCH3 ← C 6H3(OH)2CO + CH3 and/or C 6H3(OH)2COCH3 → C 6H3(OH)2 + CO + CH3. The photofragment translational energy distribution suggests that reaction 1 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.

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