Discrimination of product isomers in the photodissociation of propyne and allene at 193 nm

Journal Article · Mon Mar 01 04:00:00 EST 1999 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.478318· OSTI ID:321481

Sun, W; Yokoyama, K; Robinson, J C; Suits, A G; Neumark, D M ^[1]

---

1. Department of Chemistry, California, and Chemical Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 (United States)

The photodissociation dynamics of propyne and allene are investigated in two molecular beam/photodissociation instruments, one using electron impact ionization and the other using tunable vacuum ultraviolet (VUV) light to photoionize the photoproducts. The primary dissociation channels for both reactants are C{sub 3}H{sub 3}+H and C{sub 3}H{sub 2}+H{sub 2}. Measurement of the photoionization efficiency curves on the VUV instrument shows that the C{sub 3}H{sub 3} product from propyne is the propynyl (CH{sub 3}CC) radical, whereas the C{sub 3}H{sub 3} product from allene is the propargyl (CH{sub 2}CCH) radical. The dominant C{sub 3}H{sub 2} product from both reactants is the propadienylidene (H{sub 2}CCC) radical. We also observe a small amount of secondary C{sub 3}H{sub 2} product from photodissociation of the C{sub 3}H{sub 3} radicals in both cases. {copyright} {ital 1999 American Institute of Physics.} thinsp

• OSTI ID: 321481
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 9 Vol. 110; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ALLENE
CHEMICAL REACTION KINETICS
DISSOCIATION
FAR ULTRAVIOLET RADIATION
ORGANIC COMPOUNDS
PHOTOIONIZATION
PHOTOLYSIS
PROPYNE
REACTION KINETICS