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Dalitz plot analysis of Coulomb exploding in ultrashort intense laser fields
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Coincidence momentum imaging apparatus used in the present study. The spacings between the adjacent electrodes are 8, 15, 7 mm from the bottom to the top and the length of the flight tube is . The voltages applied to the four electrodes are 660, 660, 580, and , from the bottom to the top. The laser pulse introduced into the vacuum chamber is focused onto the skimmed effusive beam with a concave mirror placed in the ultrahigh vacuum chamber.

Image of FIG. 2.
FIG. 2.

(Color online) Distribution of the triple coincidence events of the three fragment ions obtained with laser shots, plotted on the plane, where and is the total kinetic energy release. The laser duration is . The dashed borderline shows the window for the true coincidence events.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Momentum correlation expressed in the Dalitz plot. (b) Dalitz plot distribution of the three-body Coulomb explosion of , , simulated with randomly generated geometrical parameters ( and ). (c) Simulated distribution for nearly symmetric structure with , where and .

Image of FIG. 4.
FIG. 4.

(Color online) Dependence of the angle between the momenta of the two terminal ions on the initial bond angle , simulated for symmetric geometries with (solid line) and (dashed line).

Image of FIG. 5.
FIG. 5.

Distribution of the kinetic energy release obtained for the (a) and (b) intense laser fields . The small peak marked with an asterisk is due to the persistent accidental coincidence events (see Fig. 2). The dashed line represents the distribution simulated with the geometrical distribution of in the ground state. The solid line represents the results of the trial-and-error fitting to the observed results described in Sec. IV.

Image of FIG. 6.
FIG. 6.

(Color online) (a) Dalitz plot distribution of the three-body Coulomb explosion process of ozone expressed in Eq. (1) observed for the intense laser fields, and (b) the result simulated with the Coulombic potential and the initial structural distributions of neural ozone in the ground state. (c) Comparison between the cross sections of these distributions along the axis . The solid line represents the simulated results. (d) Dalitz plot distribution observed in the intense laser fields and (e) the simulated results with the optimized strucural parameters. (f) Corresponding cross sections along the axis.

Image of FIG. 7.
FIG. 7.

Structural distributions along the three coordinates (a) , (b) , (c) , obtained for the intense laser fields from the trial-and-error simulation (solid line), in comparison with the initial distributions of neutral in the ground state (dashed line). The width of the distribution, , is fixed to the original value for neutral (see text). Residual of the fit, , for the cross sections along the axis [Fig. 6(f)], plotted against the structural parameters; (d) the width for the distribution, (e) the mean , and (f) the width of the bond angle distribution. The corresponding values for neutral in the ground state are indicated with dashed lines.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dalitz plot analysis of Coulomb exploding O3 in ultrashort intense laser fields