High sensitivity detection and discrimination of gas-phase trace molecules by intra-cavity laser absorption pn a molecular slit jet
FP4 — Training and Mobility of Researchers
- Duration
- 1996-01-17 → 1997-01-16
- EU contribution
- —
- Participants
- 2
- Scheme
- RGI
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Project objective
Intra cavity laser absorption spectroscopy (ICLAS) is proposed as a too for in-situ, real-time detection of atmospheric trace molecules (ppb) of medium-large size (benzene, toluene...). ICLAS allows multiplexed broad-band detection of broad spectral feature with extremely high sensitivity. Recent progress in solid-state lasers make it possible to build an improved and portable ICLAS spectrometer, possessing a resolution well suited to detection of the first overtone transitions of X-H vibrational modes (X = C, O. N...), in the wavelength range 1-2 micrometers. In large molecules, the unresolved rotational structure produces an effective broadening which will be partially removed by cooling the sample in a molecular slit-jet. The vibrational structure thus revealed will be used as a molecular 'fingerprint' to allow discrimination of species coexisting in the sample.
Original text from CORDIS.
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Data: CORDIS, © European Union