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Multiphoton ionization and electron recombination processes are studied in argon using coherent microwave Rayleigh scattering from a localized, resonance-enhanced multiphoton ionization produced plasma. A time dependent one-dimensional plasma dynamic model is developed to predict the time evolution of the microwave scattering from the plasma. Experimental results of the argon ionization spectrum and electron recombination rates are in good agreement with the model predictions.
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http://dx.doi.org/10.1103/PhysRevLett.98.265005 | DOI Listing |
Chem Sci
August 2025
Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, UMR5306 F-69100 Villeurbanne France
The possibility of observing correlation-driven charge migration has been a driving force behind theoretical and experimental developments in the field of attosecond molecular science since its inception. Despite significant accomplishments, the unambiguous experimental observation of this quantum beating remains elusive. In this work, we present a method to selectively trigger such dynamics in molecules predicted to exhibit long-lived electron coherence.
View Article and Find Full Text PDFJ Phys Chem Lett
August 2025
Dept. of Physics, University of Toronto, Toronto, ON Canada, M5R 2M8.
The extraction and analysis of intact proteins from complex biological samples via femtosecond laser ablation are influenced by wavelength-dependent multiphoton and avalanche ionization processes. To investigate these effects, an intact protein mixture with molecular weights ranging from 9 kDa to 68 kDa as well as individual proteins were sampled using laser wavelengths spanning from the ultraviolet to the near-infrared. Our results suggest that visible and infrared wavelengths enable intact protein extraction, even for proteins with strong absorption in the visible spectrum.
View Article and Find Full Text PDFSci Rep
August 2025
Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroclaw, 50422, Poland.
The measurements of the optical properties of GaN nanoceramics are reported. In particular, the laser induced white emission (LIWE) and photocurrent (LIPC) were investigated. LIWE and LIPC was measured in closed cycles: forward, with increasing excitation power density, and backward, with decreasing excitation power density, with hysteresis occurring.
View Article and Find Full Text PDFPhys Rev Lett
June 2025
Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan.
Acceleration of positive muons from thermal energy to 100 keV has been demonstrated. Thermal muons were generated by resonant multiphoton ionization of muonium atoms emitted from a sheet of laser-ablated aerogel. The thermal muons were first electrostatically accelerated to 5.
View Article and Find Full Text PDFSensors (Basel)
July 2025
Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Benzene, toluene, ethylbenzene, and xylene (BTEX) are widespread volatile organic compounds commonly present in fuels and various industrial materials. Their release into the atmosphere significantly contributes to air pollution, prompting strict regulatory concentration limits in ambient air. In this work, we introduce Multiphoton Electron Extraction Spectroscopy (MEES) as an innovative technique for the sensitive, selective, and online detection and quantitation of BTEX compounds under ambient conditions.
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