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Channel-Resolved Ultrafast Dissociation Dynamics of NO2 Molecules Studied via Femtosecond Time-Resolved Ion Imaging
Sizuo Luo
Author NameAffiliationE-mail
Sizuo Luo Institute of Atomic and Molecular Physics, Jilin University luosz@jlu.edu.cn 
Abstract:
We investigate the ultrafast dissociation dynamics of NO2 molecules by using femtosecond laser pump-probe mass spectra and velocity map imaging (VMI) measurements. The results show that the kinetic energy release (KER) of NO+ ions has two components, 0.05 eV and 0.25 eV, and the possible dissociation channels have been assigned. The channel resolved transient measurement of NO+ provides us a method to disentangle the contribution of ultrafast dissociation pathways, and the transient curves of NO+ ions at different KER are fitted by a biexponential function. The fast component with a decay time of 0.25 ps is generated from dissociation of Rydberg states. The slow component are generated from two competitive channels, one of the channel is absorbing one 400 nm photon to the excited state A2B2, which have a decay time of 30.0 ps. The other slow channel is absorb three 400 nm photons to a Rydberg and valence type excited states which have a decay time less than 7.2 ps. The channel and time resolved experiment present the potential of sort out the complex ultrafast dissociation dynamics of molecules.
Key words:  ultrafast dynamics  strong field ionization  photodissociation dynamics  velocity map imaging
FundProject:
Channel-Resolved Ultrafast Dissociation Dynamics of NO2 Molecules Studied via Femtosecond Time-Resolved Ion Imaging
Sizuo Luo
摘要:
We investigate the ultrafast dissociation dynamics of NO2 molecules by using femtosecond laser pump-probe mass spectra and velocity map imaging (VMI) measurements. The results show that the kinetic energy release (KER) of NO+ ions has two components, 0.05 eV and 0.25 eV, and the possible dissociation channels have been assigned. The channel resolved transient measurement of NO+ provides us a method to disentangle the contribution of ultrafast dissociation pathways, and the transient curves of NO+ ions at different KER are fitted by a biexponential function. The fast component with a decay time of 0.25 ps is generated from dissociation of Rydberg states. The slow component are generated from two competitive channels, one of the channel is absorbing one 400 nm photon to the excited state A2B2, which have a decay time of 30.0 ps. The other slow channel is absorb three 400 nm photons to a Rydberg and valence type excited states which have a decay time less than 7.2 ps. The channel and time resolved experiment present the potential of sort out the complex ultrafast dissociation dynamics of molecules.
关键词:  ultrafast dynamics  strong field ionization  photodissociation dynamics  velocity map imaging
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