Potential energy surface for the phenyl radical as calculated by Madden et al. (Ref. 26) at the G2M level of theory. The asymptotic channels 1, 2, and 3 are indicated.
Schematic of apparatus showing the radical source, photodissociation laser, and rotating mass spectrometer detector.
Mass spectra of the molecular beam of nitrosobenzene in helium taken with the pyrolytic source unheated in the upper trace and heated in the lower trace.
Characteristic TOF spectra for fragments collected at , 5°, 6°, and 8° obtained from 248 and 193 nm photodissociation of . The fits to these TOF spectra (solid lines) are generated from the distributions in Figs. 8 and 9, respectively.
Characteristic TOF spectra for and fragments collected at , 12°, and 15° obtained from 193 nm photodissociation of . A single distribution, shown in Fig. 10, was used to fit these spectra.
TOF spectra of at 193 nm showing contributions from daughter ions of mass 76 and mass 51 fragments. In each spectrum, these contributions are fit, respectively, with a dotted line using the distribution in Fig. 9 and a dashed line using the distribution in Fig. 10. The solid black line shows the sum of the dashed and dotted simulations.
Newton diagram for the phenyl radical photodissociation at 193 nm. Each circle represents the maximum center-of-mass speeds of product photofragments. The solid black circles represent the fragments, while the dotted circle represents the fragment. Maximum laboratory scattering angles for the fragments are shown.
Center-of-mass distribution from phenyl photodissociation at 248 nm to . The maximum available translational energy assumed for channel 1 is set at 37 kcal/mol. Due to the minimum laboratory detection angle of 3° for the current experimental setup, points below 5 kcal/mol are less reliable than those at higher energy.
Center-of-mass distribution from phenyl photodissociation at 193 nm to form . The maximum available translational energy assumed for channel 1 is set at 72 kcal/mol. Due to the minimum laboratory detection angle of 3° for the current experimental setup, points below 5 kcal/mol are less reliable than those at higher energy.
Center-of-mass distribution for the channel shown in Fig. 6. This distribution was used to fit the TOF spectra for both and 26. The maximum allowed translational energy is set at 50 kcal/mol.
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