ABSOLUTE INFRARED INTENSITY OF THE 4-0 VIBRATION-ROTATION BAND OF CARBON MONOXIDE

Author Institution: Astrophysics Branch, Ames Research CenterThe 4-0 band of carbon monoxide has been recorded photoelectrically at a resolution of about $0.055 cm^{-1}$ at pressure-path length combinations between 50 Torr-2.1 km and 250 Torr-0.5 km. The strengths of individual lines were determined via measurements of their equivalent widths. The resulting band strength and Herman-Wallis factor are $S_{BAND}(273^\circ K$ ) = $4.12 \times 10^{-5}$ $cm^{-1}$ / cm-atm and $F^{4}_{o} (m) = 1 + (0.0355)m + (4.81 \times 10^{-4})m^{2}$ respectively. Numerical calculations are combined with the data to obtain the magnitude and sign of the M4 term in the dipole moment expansion. The influence of various terms in the dipole moment expansion on the intensity of transitions of astrophysical interest is discussed