Temperature dependence of the absorption cross sections of formaldehyde between 223 and 323 K in the wavelength range 225-375 nm

UV absorption cross sections of formaldehyde (HCHO) have been measured with a spectral resolution of 0.025 nm in the wavelength range 225-375 nm at 298 K using a diode array detector. At Selected temperatures ranging from 223 to 323 K, measurements have been conducted to obtain temperature gradients in the wavelength range 250-356 nm. Error limits for the reported absorption cross sections are +/-5% but at least +/-3 x 10(-22) cm(2) molecule(-1). For the temperature gradients, uncertainties are <8%. Spectra and temperature gradients are compared with earlier measurements.