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Zusammenfassung
The velocity and angular distribution of NO fragments produced by UV photodissocn. of nitrosobenzene have been detd. by velocity-map ion-imaging. Excitation of the S2-state by irradn. into the peak of the first UV absorption band at 290.5 nm leads to a completely isotropic velocity distribution with Gaussian shape. The av. kinetic energy in both fragments correlates with the rotational energy of ...
Zusammenfassung
The velocity and angular distribution of NO fragments produced by UV photodissocn. of nitrosobenzene have been detd. by velocity-map ion-imaging. Excitation of the S2-state by irradn. into the peak of the first UV absorption band at 290.5 nm leads to a completely isotropic velocity distribution with Gaussian shape. The av. kinetic energy in both fragments correlates with the rotational energy of the NO fragment and increases from 6% of the excess energy for j = 6.5 to 11% for j = 29.5. A similar isotropic distribution albeit with larger av. velocity is obsd. when the ionization laser at 226 nm is also used for photodissocn., corresponding to excitation into a higher electronic state Sn (n >= 3) of nitrosobenzene. It is concluded that photodissocn. occurs on a timescale much slower than rotation of the parent mol., and after redistribution of the excess energy into the vibrational degrees of freedom.
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