Abstract
It is shown that the use of high luminance LED emitters as a light source for Fourier transform spectrometers permits to enhance their threshold sensitivity in the visible range by orders of magnitude. Using a 2.5W Edixeon EDEI-1LS3 emitter in the range of 11,350−11,700cm−1 as a light source for the spectrometer with a 60-cm multipass cell during a 24-h measurement time, we have achieved a signal-to-noise ratio of 4.5×104 which corresponds to the minimal detectable absorption coefficient of 1.2×10−8cm−1.Such enhanced sensitivity spectrometer has been used to measure the transition frequencies of CO2 vibrational bands 00051−00001 and 01151−01101 in the range of 11,400−11,500cm−1.
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