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Allene and propyne, these two C3H4 isomers, are both important
in combusition and intersteller chemistry. They are thought to be
the source of some very important free radicals. In this paper, we
use UV laser to dissociate these C3H4 isomers and then detect the
dissociation products by laser induced flurescence or time of flight
mass spectrum techniques. From the LIF spectra, the produced C3 radicals
seem to be at some excited vibrational states which are never seen
before. On the other hand, the photodissociation routes of allene and
propyne can be determined by the mass spectrum. For both molecules, the
H-elimination is the main dissociate route. By changing the dissociate
UV laser wavelength, we find that there are some possibility for H atom
scrambling. Using CD3CCH, the propyne isotope, as dissociation reactant,
we find that the H-elimination process is direct elimination from propyne,
and the main H-elimination process is coming from the methyl group of
propyne.
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