# SELF- AND AIR-BROADENED LINEWIDTHS OF FORMAL--DEHYDE

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 Title: SELF- AND AIR-BROADENED LINEWIDTHS OF FORMAL--DEHYDE Creators: Tejwani, G. D. T.; Yeung, Edward S. Issue Date: 1977 Publisher: Ohio State University Abstract: Self-broadened and foreign-gas ($N_{2}$ and $O_{2}$) broadened linewidths of $H_{2}CO$ at $300^\circ K$ for a wide range of quantum numbers J and $K_{a}$, 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 interaction were found to contribute negligibly to the line-width. Because of this, in the case of $H_{2}CO-H_{2}CO$ collisions, only dipole-dipole interaction has been included For $H_{2}CO-N_{2}$ and $H_{2}CO-O_{2}$ collisions, dipole-quadrupole interaction was taken Into account. Computed values for self- and $N_{2}$-broadened linewidths are in good agreement with the measured values reported in the literature. Air-broadened linewidths of $H_{2}CO$ have also been calculated at $200^\circ K$ so that the temperature dependence can be estimated. Description: Author Institution: Ames Laboratory-ERDA and Department of Chemistry, Iowa State University URI: http://hdl.handle.net/1811/10243 Other Identifiers: 1977-TE-12