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A crossed-beam study of the reaction: The resonance-mediated channel
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10.1063/1.2217374
/content/aip/journal/jcp/125/13/10.1063/1.2217374
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/13/10.1063/1.2217374
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(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.

Image of FIG. 2.
FIG. 2.

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 .

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

State-resolved angular distributions derived from Fig. 3.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

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.

Image of FIG. 7.
FIG. 7.

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.

Image of FIG. 8.
FIG. 8.

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.

Image of FIG. 9.
FIG. 9.

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.

Image of FIG. 10.
FIG. 10.

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.

Image of FIG. 11.
FIG. 11.

(Color) 3D representation of the vibrationally resolved angular distributions showing their evolution with the change in collision energy.

Image of FIG. 12.
FIG. 12.

(Color) 3D representation of the rotationally partial-resolved angular distributions showing their evolution with the change in collision energy.

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/content/aip/journal/jcp/125/13/10.1063/1.2217374
2006-10-02
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A crossed-beam study of the F+HD→HF+D reaction: The resonance-mediated channel
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/13/10.1063/1.2217374
10.1063/1.2217374
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