 Femtochemistry: Atomic-Scale Dynamics of the Chemical Bond Using Ultrafast Lasers by Ahmed H. Zewail

Author Nobel Lecture, 8 December 1999. Official author repository identifies Ahmed H. Zewail; H. is not expanded. The lecture explains pump–probe femtosecond spectroscopy, controlled optical delay and wave-packet dynamics. The section The NaI Discovery and Figure 15 discuss the NaI/NaBr experiments reported in 1988. The 2000 journal republication is distinct from the 1999 lecture date.

The Nobel lecture was delivered in 1999; its journal republication is dated 2000. Figure 15 discusses sodium iodide pump–probe traces: oscillatory complex signals and the structured appearance of free-fragment signals probe motion between ionic and covalent configurations. These are repeated-ensemble spectroscopic measurements rather than individual-molecule movies. Primary lecture: www.nobelprize.org/uploads/2018/06/zewail-lecture.pdf . The Caltech author record authors.library.caltech.edu/records/yybd1-vcx54 identifies the author as Ahmed H. Zewail; the initial H. is retained without expansion.

Related primary experimental report: Todd S. Rose, Mark J. Rosker and Ahmed H. Zewail, Femtosecond real-time observation of wave packet oscillations (resonance) in dissociation reactions, Journal of Chemical Physics 88(10), 6672–6673 (15 May 1988), DOI 10.1063/1.454408. Author repository authors.library.caltech.edu/records/55vz5-ymz44 verifies the bylines and publication details; the lecture discusses the NaI/NaBr interpretation in The NaI Discovery and Figure 15.