Photodissociation of the Propargyl (C3D3) Radicals at 248 nm and 193 nm

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The photodissociation of perdeuterated propargyl (D{sub 2}CCCD) and propynyl (D{sub 3}CCC) radicals was investigated using fast beam photofragment translational spectroscopy. Radicals were produced from their respective anions by photodetachment at 540 nm and 450 nm (below and above the electron affinity of propynyl). The radicals were then photodissociated by 248 nm or 193 nm light. The recoiling photofragments were detected in coincidence with a time- and position-sensitive detector. Three channels were observed: D{sub 2} loss, CD + C{sub 2}D{sub 2}, and CD{sub 3} + C{sub 2}. Obervation of the D loss channel was incompatible with this experiment and was not ... continued below

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Neumark., D.M.; Crider, P.E.; Castiglioni, L. & Kautzman, K.K. January 21, 2009.

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The photodissociation of perdeuterated propargyl (D{sub 2}CCCD) and propynyl (D{sub 3}CCC) radicals was investigated using fast beam photofragment translational spectroscopy. Radicals were produced from their respective anions by photodetachment at 540 nm and 450 nm (below and above the electron affinity of propynyl). The radicals were then photodissociated by 248 nm or 193 nm light. The recoiling photofragments were detected in coincidence with a time- and position-sensitive detector. Three channels were observed: D{sub 2} loss, CD + C{sub 2}D{sub 2}, and CD{sub 3} + C{sub 2}. Obervation of the D loss channel was incompatible with this experiment and was not attempted. Our translational energy distributions for D{sub 2} loss peaked at nonzero translational energy, consistent with ground state dissociation over small (< 1 eV) exit barriers with respect to separated products. Translational energy distributions for the two heavy channels peaked near zero kinetic energy, indicating dissociation on the ground state in the absence of exit barriers.

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  • Journal Name: The Journal of Chemical Physics; Journal Volume: 130; Journal Issue: 1; Related Information: Journal Publication Date: 2009

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  • Report No.: LBNL-1486E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 953687
  • Archival Resource Key: ark:/67531/metadc934885

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  • January 21, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 18, 2016, 3:56 p.m.

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Neumark., D.M.; Crider, P.E.; Castiglioni, L. & Kautzman, K.K. Photodissociation of the Propargyl (C3D3) Radicals at 248 nm and 193 nm, article, January 21, 2009; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc934885/: accessed December 9, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.