Femtosecond laser pulses distinguish bacteria from background urban aerosols
作者： François Courvoisier , Véronique Boutou , Vanessa Wood , Andreas Bartelt , Matthias Roth
DOI: 10.1063/1.2007870
关键词: Laser 、 Femtosecond 、 Optical pumping 、 Bioluminescence 、 Pulse (signal processing) 、 Fluorescence 、 Chemistry 、 Ultrashort pulse 、 Analytical chemistry 、 Absorption (electromagnetic radiation)
摘要: The fluorescence from living bacteria (Bacillus subtilis, Enteroccocus and Escherichia coli), induced by a ultrashort 270 nm pump pulse is depleted up to 50% an optically delayed ultrafast 810 probe in pump-probe arrangement. fast (subpicosecond) decrease occurs for delay of Δt>2ps. Depletion also observed tryptophan water contrast with organic cyclic molecules such as naphtalene or diesel fuel, despite similar absorption spectra. This remarkable difference allows us propose new remote sensing method able efficiently discriminate biological aerosols highly populated urban areas.
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