High Accuracy Line Profile Study of Transitions in the 30012←00001 and 30013←00001 Bands of Carbon Dioxide

Abstract

This work is a room temperature study of the 30012←00001 and 30013←00001 vibrational bands in self‐ and air‐broadened carbon dioxide. The spectra were recorded at a resolution of 0.008 cm−1 or 0.009 cm−1 using a Fourier transform spectrometer and a temperature stabilized long path absorption cell. The analysis is performed using a multispectrum nonlinear least squares fitting technique where the spectra are fitted simultaneously in spectral intervals of about 3 cm−1. Voigt and Speed Dependent Voigt line shape models are used. Intensities, self‐ and air‐broadening, shifts, and weak line mixing coefficients are determined and compared with other studies. Comparisons are also made to demonstrate the importance of considering the line shape effects for measurements in Earth’s atmosphere using satellite remote sensing. Examples of multispectrum fits with and without the inclusion of line mixing are also given. Exponential Power Gap (EPG) and Energy Corrected Sudden (ECS) scaling laws are used to calculate the ...