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| Item type: | Article | ||||
|---|---|---|---|---|---|
| Journal or Publication Title: | Physical Chemistry Chemical Physics | ||||
| Volume: | 5 | ||||
| Number of Issue or Book Chapter: | 13 | ||||
| Page Range: | pp. 2799-2806 | ||||
| Date: | 2003 | ||||
| Additional Information (public): | CAN 139:267843 74-1 Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes 2396-01-2 (Phenyl radical); 7782-44-7 (Oxygen); 10102-43-9 (Nitrogen monoxide); 14452-93-8 (Nitrogen monoxide ion(1+) Role: CPS (Chemical process), FMU (Formation, unclassified), PEP (Physical, engineering or chemical process), PRP (Properties), FORM (Formation, nonpreparative), PROC (Process) (velocity-map ion-imaging of NO fragment from UV-photodissocn. of nitrosobenzene); 586-96-9 (Nitrosobenzene) Role: CPS (Chemical process), PEP (Physical, engineering or chemical process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or reagent) (velocity-map ion-imaging of NO fragment from UV-photodissocn. of nitrosobenzene); 10102-44-0 (Nitrogen oxide (NO2) Role: CPS (Chemical process), PEP (Physical, engineering or chemical process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or reagent) (velocity-map ion-imaging of NO fragment from UV-photodissocn. of nitrosobenzene in relation to photodissocn. of) | ||||
| Institutions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry III - Physical Chemistry (Molecular Spectroscopy and Photochemistry) > Prof. Dr. Bernhard Dick | ||||
| Identification Number: |
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| Keywords: | Angular distribution function; Photoionization; Photolysis; Singlet state transition; Velocity (velocity-map ion-imaging of NO fragment from UV-photodissocn. of nitrosobenzene); photodissocn UV nitrosobenzene velocity map ion imaging | ||||
| Dewey Decimal Classification: | 500 Science > 540 Chemistry & allied sciences | ||||
| Status: | Published | ||||
| Refereed: | Yes, this version has been refereed | ||||
| Created at the University of Regensburg: | Yes | ||||
| Item ID: | 5571 |
Abstract
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 ...
Abstract
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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