Knowledge Bank

The vibrational overtone spectra of gaseous $CO2$ and $N2O$ were obtained by laser photoacoustic method between 700 and 800 nm. The transitions include $(0,20,5)-(0.00.0).(1,00,5)-(0,00,0)$ for $CO21$ and $(6,20,2)-(0,00,0),(0.11,6)-(0.11.0).(0,00,0)(0,00,0)$ for $N2O2$. The $(1,00,5)-(0,00,0)$ transition of $CO2$ and the $(0,00,6)-(0,00,0)$ transition of $N2O$ have well-defined structures and show no significant perturbation. By comparing the integrated band intensities of water in the same spectral range to that of $CO2$ (or $N2O$) and from the knowledge of absorption intensities of water, the absolute absorption intensities were determined.