The rotationally-resolved absorption spectrum of formaldehyde from 6547 to 6804 cm−1

The room temperature absorption spectrum of formaldehyde, H2CO, from 6547 to 6804 cm−1 (1527-1470 nm) is reported with a spectral resolution of 0.001 cm−1. The spectrum was measured using cavity-enhanced absorption spectroscopy (CEAS) and absorption cross-sections were calculated after calibrating the system using known absorption lines of H2O and CO2. Several vibrational combination bands occur in this region and give rise to a congested spectrum with over 8000 lines observed. Pressure broadening coefficients in N2, O2, and H2CO are reported for an absorption line at 6780.871 cm−1, and in N2 for an absorption line at 6684.053 cm−1.