Based on a quantum-mechanical model, we calculate the time evolution of an initial nuclear vibrational wave packet in D 2 + generated by the rapid ionization of D 2 in an ultrashort pump-laser pulse. By Fourier transformation of the nuclear probability density with respect to the time delay between the pump pulse and the instant destructive Coulomb-explosion imaging of the wave packet at the high-intensity spike of an intense probe-laser pulse, we provide two-dimensional

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... pendent power spectra that serve as a tool for visualizing and analyzing the nuclear dynamics in D 2 + in an intermittent external laser field. The external field models the pedestal to the central ultrashort spike of a realistic probe pulse. Variation in the intensity, wavelength, and duration of this probe-pulse pedestal ͑i͒ allows us to identify the optimal laser parameters for the observation of field-induced bond softening and bond hardening in D 2 + and ͑ii͒ suggests a scheme for quantitatively testing the validity of the "Floquet picture" that is commonly used for the interpretation of short-pulse laser-molecule interactions, despite its implicit "continuum wave" ͑infinite pulse length͒ assumption.