Abstract:We use offset-frequency-free difference frequency generation comb sources and a Fourier transform spectrometer with comb-mode-width limited resolution to measure and analyze spectra of molecular species of atmospheric relevance: CH3I and CH2Br2 around 3000 cm-1, and 14N 162O around 1280 cm-1.
“…The discrepancy between our measurement the HITRAN database is up to 10 MHz. Since it qualitatively matches a recent measurement [10], we account for it through the uncertainty of the database, given as between 30 and 300 MHz.…”
We present a mid-infrared dual comb spectrometer featuring fast acquisition (54 ms), high spectral resolution (630 kHz), and high frequency accuracy (2 MHz), in the 7.8 um wavelength range.
“…The discrepancy between our measurement the HITRAN database is up to 10 MHz. Since it qualitatively matches a recent measurement [10], we account for it through the uncertainty of the database, given as between 30 and 300 MHz.…”
We present a mid-infrared dual comb spectrometer featuring fast acquisition (54 ms), high spectral resolution (630 kHz), and high frequency accuracy (2 MHz), in the 7.8 um wavelength range.
“…The discrepancy between our measurement and the HITRAN database is up to 10 MHz. Since it qualitatively matches a recent measurement [5], we account for it through the uncertainty of the database, given as between 30 and 300 MHz.…”
We present a mid-infrared dual comb spectrometer featuring fast acquisition (54 ms), high spectral resolution (630 kHz), and high frequency accuracy (2 MHz), in the 7.8 µm wavelength range.
We acquire interleaved spectra with a frequency scale that is accurate to within ±2 MHz in 54 ms using a dual-comb spectrometer with two quantum cascade laser frequency combs around 1300 cm−1.
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