Pressure-broadened linewidths of formaldehyde

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Abstract
Self‐broadened and foreign‐gas (N2 and O2) ‐broadened linewidths of H2CO at 300°K for a wide range of quantum numbers J and Ka, for all three types of bands, have been calculated using the Anderson–Tsao–Curnutte theory of line broadening. Due to the large dipole moment of formaldehyde, quadrupolar interactions were found to contribute negligibly to the linewidth. Because of this, in the case of H2CO–H2CO collisions, only dipole–dipole interaction has been included. For H2CO–N2 and H2CO–O2 collisions, dipole–quadrupole interaction was taken into account. Computed values for self‐ and N2‐broadened linewidths are in good agreement with the measured values reported in the literature. Air‐broadened linewidths of H2CO have also been calculated at 200°K so that the temperature dependence can be estimated.