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A laser-induced fluorescence diagnostic for simultaneous ion-neutral interaction measurements in ionospheric-like
Junnan Jiang1, Yisen Zhang1, Yu Liu1,2
1Deep Space Exploration Laboratory/School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China.
None:
Ion-neutral interactions critically influence ionospheric dynamics, significantly affecting satellite communication and navigation systems. To comprehensively understand these interactions, precise laboratory measurements under controlled conditions are essential. Laser-induced fluorescence (LIF), a non-intrusive and high-resolution diagnostic method, is particularly effective for accurately measuring particle velocities and temperatures. In this study, we introduce a specialized LIF diagnostic system, which employs two lasers and dual optical setups to simultaneously measure neutral and ion parameters. Through spectral separation, this approach enables concurrent axial and radial velocity and temperature measurements for ions and neutrals. Preliminary experiments verified system reliability, successfully obtaining fluorescence signals from argon neutrals (Ar I) and ions (Ar II). Particle velocities and temperatures were determined through Gaussian fitting of the observed spectral lines. Experimental data revealed that argon neutral fluorescence intensity correlated positively with gas pressure, whereas ion fluorescence intensity exhibited an inverse relationship with pressure. This developed LIF diagnostic system significantly advances precise measurements of ion-neutral interaction, supporting deeper exploration of ionospheric and astrophysical plasma phenomena.
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