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- W320444521 abstract "A novel forward phase-matching geometry for degenerate four-wave mixing is demonstrated in the mid-infrared spectral region by measuring acetylene (C2H2) and hydrogen chloride (HCl) molecules by probing their fundamental ro-vibrational transitions using an IR laser pulses tunable from 2900 cm -1 to 3350 cm -1 with a 0.025 cm -1 line. At room temperature and atmospheric pressure, a detection limit of 35 ppm (~9.5×10 14 molecules/cm 3 ) for C2H2 has been achieved in a gas flow of C2H2/N 2 mixture by scanning the P(11) line of the (010(11) 0 )-(0000 0 0 0 ) band. The detection limit of the HCl molecule is measured to be 25 ppm (~6.8×10 14 molecules/cm 3 ) in the same environment by probing the R(4) line. Using C2H2 as demonstrating species, the dependences of signal intensities on species concentrations and laser pulse energies were investigated, respectively. The variations of the signal line shapes depending on the buffer gas pressures and laser intensities were recorded and analyzed. The experimental setup demonstrated facilitates the practical implementation of sensitive molecular species sensing with an in situ, species-specified, spatial and temporal resolved manner in the spectral region of 2.7 ~ 3.3 µm (3000 ~ 3700 cm -1 ), where various important combustion species have absorption bands." @default.
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- W320444521 date "2009-01-01" @default.
- W320444521 modified "2023-09-27" @default.
- W320444521 title "Detection of C 2H2 and HCl using mid-infrared degenerated four-wave mixing with a novel beam arrangements: Towards practical in situ trace molecular species sensing" @default.
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