We systematically investigate the attosecond joint energy spectra (JESs) of the dissociative wave packet of ${\mathrm{H}}_2^{+}$ by numerically solving the time-dependent Schrödinger equation. The dissociative wave packet, initially prepared by a resonant pump pulse and subsequently ionized by a single-attosecond extreme-ultraviolet pulse with a variable time delay, produces time-resolved JESs that exhibit splitting and distorted structures, encoding rich information on ultrafast molecular dynamics. Interestingly, variations in the slopes of the energy-sharing lines in the JESs are observed, in contrast to the ground-state scenario where the slope is $-1$. The origin of the slope variations is well explained by an analytical model combined with the Wentzel-Kramers-Brillouin approximation, and is attributed to the dispersion relation of the dissociative nuclear wave packet. Based on these findings, we propose a novel method for imaging the molecular potential energy curves, which remains robust even when the JESs are distorted by two-center interference.

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• Interatomic & molecular potentials
• Molecular dissociation
• Photodissociation
• Photoemission
• Single- and few-photon ionization & excitation