Near infrared cavity enhanced absorption spectra of atmospherically relevant ether-1, 4-Dioxane

• We recorded the near infrared spectrum of 1, 4-dioxane with a resolution of 0.08 cm− 1.
• Technique used is Fourier-transform cavity enhanced absorption spectroscopy.
• The recorded data contains numerous weak absorption features.
• The possible combination and overtone bands corresponding to selected spectral region are tabulated.
• Weaker lines were enhanced above noise level due to increased effective path length of CEAS approach.

1, 4-Dioxane (DX) is a commonly found ether in industrially polluted atmosphere. The near infrared absorption spectra of this compound has been recorded in the region 5900–8230 cm− 1 with a resolution of 0.08 cm− 1 using a novel Fourier transform incoherent broadband cavity-enhanced absorption spectrometer (FT-IBBCEAS). All recorded spectra were found to contain regions that are only weakly perturbed. The possible combinations of fundamental modes and their overtone bands corresponding to selected regions in the measured spectra are tabulated. Two interesting spectral regions were identified as 5900–6400 cm− 1 and 8100–8230 cm− 1. No significant spectral interference due to presence of water vapor was observed suggesting the suitability of these spectral signatures for spectroscopic in situ detection of DX. The technique employed here is much more sensitive than standard Fourier transform spectrometer measurements on account of long effective path length achieved. Hence significant enhancement of weaker absorption lines above the noise level was observed as demonstrated by comparison with an available measurement from database.

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