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The photodissociation dynamics of the ethyl radical, C2H5, investigated by velocity map imaging
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Image of FIG. 1.
FIG. 1.

Ethyl radicals were produced by flash pyrolysis of n-propyl nitrite. Formaldehyde and nitric oxide are formed as side products in the pyrolysis. In addition, experiments using partially deuterated propyl nitrite were carried out.

Image of FIG. 2.
FIG. 2.

(a) Symmetrized image of the H-atoms detected upon photodissociation of ethyl at 250 nm and (b) the same image but reconstructed with pBASEX.

Image of FIG. 3.
FIG. 3.

Angular distribution of the hydrogen atoms: While the slow H-atoms (lower trace) show an isotropic angular distribution, a significant anisotropy is found for the fast atoms (upper trace).

Image of FIG. 4.
FIG. 4.

The translational energy distribution derived from the image (perpendicular polarization). The fast H-atoms are fitted with a Gaussian function while the slow ones are fitted with a one-parameter distribution function (see text for details).

Image of FIG. 5.
FIG. 5.

Doppler scan of the H-and D-atoms obtained from the pyrolysis of partially deuterated n-propyl nitrite. From the small amount of deuterium observed, significant contributions of formaldehyde to the H-atom signal are ruled out.

Image of FIG. 6.
FIG. 6.

The Doppler-profile of CD3CH2 photofragments shows a preference of D-loss and thus a high degree of regioselectivity.

Image of FIG. 7.
FIG. 7.

Time-delay scans of the D-atom signal from CD3CH2. The dotted line corresponds to high extraction voltages that permit to map all D-atoms onto the detector. To record the delay trace represented by the full line, the fields in the ion optics were set in a way to discriminate against D-atoms with large translational energy. The presence of a dissociation channel with a slow rate of D-atom formation is evident.

Image of FIG. 8.
FIG. 8.

Structures and energy levels possibly involved in the photodissociation of ethyl. The graph follows a similar figure given by Amaral et al. 9 See text for details of the energetics.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The photodissociation dynamics of the ethyl radical, C2H5, investigated by velocity map imaging