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Chemical reaction dynamics of Rydberg atoms with neutral molecules: A comparison of molecular-beam and classical trajectory results for the reaction
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10.1063/1.1998807
/content/aip/journal/jcp/123/7/10.1063/1.1998807
http://aip.metastore.ingenta.com/content/aip/journal/jcp/123/7/10.1063/1.1998807

Figures

Image of FIG. 1.
FIG. 1.

Contour map of the ground electronic state KBNN-PES of . The potential energy in eV is plotted as a function of and (in a.u.) for the -shaped geometry. is the distance between and the center of mass of , is the distance of .

Image of FIG. 2.
FIG. 2.

The total integral cross section (excitation function) for the reaction on the KBNN-PES as a function of collision energy. The solid curve is the result of the QCT simulation and the symbols denote the prediction of the Langevin model with a constant transmission coefficient.

Image of FIG. 3.
FIG. 3.

Product translation energy distribution for the reaction at four different collision energies.

Image of FIG. 4.
FIG. 4.

Center-of-mass total (final-state summed) differential cross section for at 0.224, 0.524, 1.024, and in . The scattering angle is defined as the angle between the incident beam and the product.

Image of FIG. 5.
FIG. 5.

The state-specific DCS in at different collision energies for obtained from QCT with the Gaussian binning method. (a) , (b) , (c) , and (d) .

Image of FIG. 6.
FIG. 6.

(a) The collision time distribution for the reaction at computed using all reactive trajectories. The fitted lifetime is . (b) The impact parameter fixed (and hence fixed) collision lifetimes obtained by fitting the lifetime distribution of classical ensembles.

Image of FIG. 7.
FIG. 7.

Energy dependence of the fitted collision lifetimes at .

Image of FIG. 8.
FIG. 8.

A comparison of the product rotational number distribution between the experimental and QCT results at a special scattering angle (laboratory ). In the upper panel the QCT results are obtained from the Gaussian binning method, while in the lower panel the QCT results are obtained from the histogram binning method.

Image of FIG. 9.
FIG. 9.

Experimental product rotational distributions (see Ref. 17). The broadened spectrum is the TOF distribution (expressed as product translational energy in wavenumbers) measured for the reaction at the laboratory angle of 5° at . The stick spectrum is the fitted distribution obtained for reaction at the laboratory scattering angle of 5° at . The peak denoted by for the RA spectrum is contaminated by the inelastic channel. The peak with + is assigned to the channel.

Image of FIG. 10.
FIG. 10.

The total (final-state summed) DCS vs c.m. scattering angle obtained from the experiment and QCT.

Image of FIG. 11.
FIG. 11.

The final-state-specific DCS angular distribution for a number of product states at . In (a), the experimental results for the reaction , while in (b) is the QCT results for the reaction . The contamination of the experimental result due to the overlapping inelastic channel has been corrected through a numerical estimation of the size of the two contributions.

Image of FIG. 12.
FIG. 12.

Ionization probability for computed from the classical impulse approximation as a function of the c.m. scattering angle for various values. The results are obtained by averaging Eq. (5) over the phase of the Bohr orbit and the orientation of the Rydberg state. The is an upper bound to the principle quantum number employed in our experiments to date and the ionization is lower for smaller values of . The scattering angle of 0 corresponds to backward (rebound) scattering of the positive charge carrier.

Tables

Generic image for table
Table I.

Energetic thresholds.

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/content/aip/journal/jcp/123/7/10.1063/1.1998807
2005-08-23
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Chemical reaction dynamics of Rydberg atoms with neutral molecules: A comparison of molecular-beam and classical trajectory results for the H(n)+D2→HD+D(n′) reaction
http://aip.metastore.ingenta.com/content/aip/journal/jcp/123/7/10.1063/1.1998807
10.1063/1.1998807
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