Wating Matter Rearrange

摘要

Can we "watch" the elementary molecular or collective motions that lead to chemical or structural change as they take place (see the figure below)? On page 1340 of this issue, Siders et al. (1) Report an important step toward this goal. Using ultrafast pulses of x-ray radiation as The probe, they monitor the melting of a Semiconductor sample after irradiation by An intense, ultrafast visible pulse.