Room temperature values for self-broadened and hydrogen-broadened Lorentz halfwidth coefficients, and self and hydrogenpressure-induced shift coefficients have been measured for transitions with rotational quantum number m ranging between )24 and24 in the 2 0 band of 12C16O. The spectra were recorded with the McMath–Pierce Fourier transform spectrometer located at theNational Solar Observatory on Kitt Peak. The analysis was performed using a multispectrum nonlinear least squares technique. Wehave compared our results with similar measurements published recently. 2004 Elsevier Inc. All rights reserved.