  Recent advances in laser technology have enabled tremendous progress in
photochemistry, at the heart of which is the breaking and formation of chemical
bonds. Such progress has been greatly facilitated by the development of
accurate quantum-mechanical simulation method, which, however, does not
necessarily accompany clear dynamical scenarios and is rather often a black
box, other than being computationally heavy. Here, we develop a wave-packet
surface propagation (WASP) approach to describe the molecular bond-breaking
dynamics from a hybrid quantum-classical perspective. Via the introduction of
quantum elements including state transitions and phase accumulations to the
Newtonian propagation of the nuclear wave-packet, the WASP approach naturally
comes with intuitive physical scenarios and accuracies. It is carefully
benchmarked with the H2+ molecule and is shown to be capable of precisely
reproducing experimental observations. The WASP method is promising for the
intuitive visualization of strong-field molecular dynamics and is
straightforwardly extensible toward complex molecules.
