English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The nonadiabatic photodissociation dynamics of alkali halide moleculesexcited by a femtosecond laser pulse in the gas phase are investigatedtheoretically, and it is shown that the population of the photoexcitedmolecules exhibits power-law decay with exponent -1/2, in contrast toexponential decay, which is often assumed in femtosecond spectroscopy andunimolecular reaction theory. To elucidate the mechanism of the power-lawdecay, a diagrammatic method that visualizes the structure of the nonadiabaticreaction dynamics as a pattern of occurrence of dynamical events, such aswavepacket bifurcation, turning, and dissociation, is developed. Using thisdiagrammatic method, an analytical formula for the power-law decay is derived,and the theoretical decay curve is compared with the corresponding numericaldecay curve computed by a wavepacket dynamics simulation in the case of lithiumfluoride. This study reveals that the cause of the power-law decay is thequantum interference arising from the wavepacket bifurcation and merging due tononadiabatic transitions.

Power-law decay in the nonadiabatic photodissociation dynamics of alkali halides due to quantum wavepacket interference