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Issue 34, 2008
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On the photodissociation of propadienylidene, l-C3H2

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Abstract

We investigate the photochemistry and photodissociation dynamics of the linear C3H2 isomer propadienylidene by two-colour photofragment Doppler spectroscopy at excitation wavelengths between 260 and 230 nm, corresponding to excitation into the C 1A1 state. Propadienylidene is generated by pyrolysis from IC3H2Br. Almost complete conversion of the precursor can only be achieved at high pyrolysis temperatures. Two reaction channels, H-atom loss and loss of H2 molecules, are energetically close. Our results show that H-atom loss is indeed important in the investigated energy range. The Doppler profiles indicate that 34–37% of the excess energy is released as translation. The rates for H-atom loss are faster than the time resolution of our nanosecond-laser setup, kH > 108 s−1.

Graphical abstract: On the photodissociation of propadienylidene, l-C3H2

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Article information


Submitted
25 Apr 2008
Accepted
30 May 2008
First published
27 Jun 2008

Phys. Chem. Chem. Phys., 2008,10, 5196-5201
Article type
Paper

On the photodissociation of propadienylidene, l-C3H2

C. Groß, B. Noller and I. Fischer, Phys. Chem. Chem. Phys., 2008, 10, 5196
DOI: 10.1039/B807049K

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