Single-shot imaging of surface molecular ionization in nanosystems

Using single-shot velocity map imaging technique, explosion imaging of different ion species ejected from 50 nm SiO nanoparticles are obtained excitedly by strong near-infrared and ultraviolet femtosecond laser fields. Characteristic momentum distributions showing forward emission of the ions at low...

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Bibliographic Details
Published in:Nanophotonics (Berlin, Germany) Germany), 2021-08, Vol.10 (10), p.2651-2660
Main Authors: Sun, Fenghao, Li, Hui, Song, Shanshan, Chen, Fei, Wang, Jiawei, Qu, Qiwen, Lu, Chenxu, Ni, Hongcheng, Wu, Botao, Xu, Hongxing, Wu, Jian
Format: Article
Language:English
Subjects:
Aerosols
Excitation
Imaging techniques
Infrared lasers
Ionization
Laboratories
Lasers
Microscopy
nanoparticle
Nanoparticles
Sensors
shock wave
Shock waves
Silicon dioxide
Spectrum analysis
strong-field ionization
surface molecules
velocity map imaging
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Summary:Using single-shot velocity map imaging technique, explosion imaging of different ion species ejected from 50 nm SiO nanoparticles are obtained excitedly by strong near-infrared and ultraviolet femtosecond laser fields. Characteristic momentum distributions showing forward emission of the ions at low excitation intensities and shock wave behaviors at high intensities are observed. When the excitation intensity is close to the dissociative ionization threshold of the surface molecules, the resulting ion products can be used to image the instant near-field distributions. The underlying dynamics of shock formation are simulated by using a Coulomb explosion model. Our results allow one to distinguish the ultrafast strong-field response of various molecular species in nanosystems and will open a new way for further exploration of the underlying dynamics of laser-and-nanoparticle interactions.
ISSN:2192-8606
2192-8614
DOI:10.1515/nanoph-2021-0172