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Photoacoustic spectroscopy of formaldehyde with tunable laser radiation at the parts per billion level

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Abstract

Selective and sensitive detection of formaldehyde (CH2O) was achieved using a grazing-incidence optical parametric oscillator (GIOPO), pumped at high repetition rate, as a light source for photoacoustic spectroscopy. The photoacoustic spectrum of formaldehyde was measured in the range from 2785 to 2840 cm-1 and an absorption line at 2805.0 cm-1 was selected for detection. Concentrations down to 20 ppbv (parts per billion by volume) formaldehyde in nitrogen were recorded. The detection limit determined by background fluctuations was 3 ppbv (S/N=1) for 3 s lock-in time constant and 3 min acquisition time. The 2805.0 cm-1 absorption line of the ν1 vibrational mode was chosen because of the absence of interference with water and carbon-dioxide bands. This allowed the direct detection of formaldehyde in laboratory air without filtering.

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Correspondence to M. Angelmahr.

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PACS

42.62.Fi; 42.68.Ca; 42.65.Yj; 07.07.Df

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Angelmahr, M., Miklós, A. & Hess, P. Photoacoustic spectroscopy of formaldehyde with tunable laser radiation at the parts per billion level. Appl. Phys. B 85, 285–288 (2006). https://doi.org/10.1007/s00340-006-2295-x

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  • DOI: https://doi.org/10.1007/s00340-006-2295-x

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