Ion-Velocity Imaging Study of Dissociative Charge Exchange Reactions between Ar+ and trans-/cis-Dichloroethylene
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Abstract: Dissociative charge exchange reactions between Ar+ ion and trans-/cis-dichloroethylene (trans-/cis-C2H2Cl2) are investigated with the ion-velocity imaging technique. The dechlorinated product C2H2Cl+ is the predominant, and most of this product show the spatial distribution around the target, implying that the dissociation occurs in the large impact-parameter collision and via the energy resonant charge transfer. Meanwhile, a few C2H2Cl+ locate around the center-of-mass, which is attributed to the fragmentation of intimate association between C2H2Cl2 and Ar+ or in the small impact-parameter collision. The product C2HCl+ exhibits the velocity distribution features similar to those of C2H2Cl+. The rarest product C2HCl2+ shows the distributions around the molecular target, due to the quick dehydrogenation after the energy-resonant charge transfer in the large impact-parameter collision.
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Figure 1. Time-sliced images of C2H235Cl+ (upper) and C2H35Cl+ (bottom) produced in the DCE reactions between Ar+ and trans-C2H2Cl2 at the center-of-mass collision energies of 3.82, 5.38, and 9.33 eV. The red circles embedded on each image indicate the velocity position of the parent ion C2H235Cl2+ produced in the energy-resonant CT from Ar+(2P3/2) to trans-C2H235Cl2. The white arrows represent the velocities of Ar+ (right pointing, backward scattering, here the velocities are too large to show all in the images within the scale) and trans-C2H2Cl2 (left pointing, forward scattering) in the center-of-mass (a white point in the image center) coordinate.
Figure 2. Energy distributions of the DCE product C2H235Cl+ (a) and C2H35Cl+ (b) from trans-C2H2Cl2 at the center-of-mass collision energies of 3.82, 5.38, and 9.33 eV. The products distributing within the range of scattering angle θ = ±10° are selected for plotting. The dashed lines denote the energy-resonant CT position (corresponding to the red circles in FIG. 1). Angular distributions of the product C2H235Cl+ (c) and C2H35Cl+ (d) in the velocity range of ±500 m/s centering on the energy-resonant CT velocity.
Figure 3. Time-sliced images of C2H235Cl+ (upper) and C2H35Cl+ (bottom) produced in the DCE reactions between Ar+ and cis-C2H2Cl2 at the center-of-mass collision energies of 2.17 and 4.05 eV. The red circles embedded on each image indicate the velocity position of the parent ion C2H235Cl2+ product in the energy-resonant charge transfer from Ar+(2P3/2) to cis-C2H235Cl2. The white arrows represent the velocities of Ar+ (right pointing, backward scattering, the velocities are too large to show all in the images within the scale at 4.05 eV) and cis-C2H2Cl2 (left pointing, forward scattering) in the center-of-mass (a white point in the image center) coordinate.
Figure 4. Energy distributions of the DCE product C2H235Cl+ (a) and C2H35Cl+ (b) from cis- C2H2Cl2 at the center-of-mass collision energies of 2.17 and 4.05 eV. The products distributing within the range of scattering angle θ = ±10° are selected for plotting. The dashed lines denote the energy-resonant CT position (corresponding to the red circles in FIG. 3). Angular distributions of the product C2H235Cl+ (c) and C2H35Cl+ (d) in the velocity range of ±500 m/s centering on the energy-resonant CT velocity.
Figure 5. Time-sliced images of C2H35Cl2+ produced in the DCE reactions between Ar+ and trans-C2H2Cl2 at the center-of-mass collision energies of 2.13 eV (a), 3.11 eV (b), 4.27 eV (c), and 9.33 eV(d) . The red circles, white arrows and white point embedded on each image indicate the same with FIG. 1.
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