(Color) Doppler profiles of the D-atom product as a function of the collision energy. All profiles, about 50 in total, were acquired with the parallel configuration. The Doppler shift is in vuv frequency, and the corresponding scattering direction in the c.m. collisional frame, forward (f) and backward (b), is indicated.
The upper panel shows two representative parallel-Doppler spectra at the indicated collision energies. The vertical dashed line marks the vuv laser frequency that slices through the center of the Newton sphere, i.e., the center of mass. The blueshift (or redshift) corresponds to backscattered (or forward scattered) D-atom product. The lower panel exemplifies a few representative Doppler-selected TOF spectra. Each corresponds to in vuv frequency or . The ion arrival time has been converted to the recoil speed along the TOF axis. The measured distribution for each Doppler slice or for each selected is the desired, conditional distribution in the c.m. frame, or .
(Color) 3D representation of the product flux-velocity contour maps at 12 collision energies of this study. All contours are oriented in the same direction as that indicated for . The vibration-resolved features are as labeled.
State-resolved angular distributions derived from Fig. 3.
Angle-specific, total kinetic energy release distributions for the reaction at . The normalized is defined as , representing the reactive fluxes scattered into the angular interval between and . The vibrational onsets of the HF product are in accord with the predictions, marked as the vertical dotted lines, from well-known thermochemistry. Note the different scaling factor for each panel.
Same as Fig. 5, except for . Note the broader vibration features for the forward scattered products than the backscattered products. Because of the large disparity in the intensities of vibration features, some panels are partitioned into two regions, marked as a vertical dotted line, with different scaling factors.
Same as Fig. 5, except for . Note the broadening of the vibrational features (compared to the lower cases, Figs. 5 and 6), indicative of higher rotational excitation of HF products. Some of the forward scattered even display double-bump features.
Same as Fig. 5, except for . The low- products are now quite significant. And the broadening and splitting of the vibrational features are even more pronounced.
Angular dependencies of energy disposals. The , , and denote the fraction of total available energy being deposited into the product vibration, rotation, and translation, respectively. The data analysis is performed for every 15° angular segment.
Dependence of angle-specific vibrational branching ratios on collision energies. The branching ratios are defined so that the sum of all over the full angular range for a given collision energy is set to be unity.
(Color) 3D representation of the vibrationally resolved angular distributions showing their evolution with the change in collision energy.
(Color) 3D representation of the rotationally partial-resolved angular distributions showing their evolution with the change in collision energy.
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