Effect of Femtosecond Laser Parameters on State Populations of Nonadiabatic Coupling Molecules

Abstract

Abstract: Influence of pulse width, laser wavelength and laser intensity on state populations of a NaI molecule driven by a pump-probe pulse was studied via time-dependent wave packet approach.Wave packet moves periodically with roundtrip time 1 000 fs.Wave packet bifurcates in crossing region firstly at delay time 200 fs, which affects state populations.Excitation probability increases and dissociation probability decreases with increasing pulse width.Excitation probability approaches the maximum at resonance pump wavelength 318 nm.Dissociation probability decreases with increasing pump wavelength.As pump intensity increases, excitation probability increases while dissociation probability does not change.Probe wavelength and probe intensity do not affect state populations.Wave packet motion and selective distribution of state populations can be achieved by adjusting laser parameters.It provides bases for realizing light manipulation of molecules experimentally.

Key words: intense femtosecond pump-probe pulse, nonadiabatic coupling NaI molecule, time-dependent wave packet approach, state populations

CLC Number:

O437

GUO Wei, BAI Jing, LI Yuehua. Effect of Femtosecond Laser Parameters on State Populations of Nonadiabatic Coupling Molecules[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2017, 34(1): 119-125.

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