Knowledge Bank

The infrared intensities of nine absorption bands of OCS and thirteen absorption bands of $N2O$ have been measured with a Fourier transform spectrometer at $0.06cm-1$ resolution. The measured bands lie between $500cm-1$ and $4600cm-1$, and include all fundamentals of each molecule and also overtone and combination bands. All measurements were made at room temperature. The partial pressure of the absorbing species ranged from 0.76 torr to 38 torr and the absorption pathlengths ranged from 1 to 15 cm resulting in pressure-pathlength products of 0.78 torr cm to 567 torr cm. The stronger bands were measured at the lower pressure-pathlengths and the weaker bands at the higher pressure-pathlengths. In all runs the absorption call was pressurized to 1 atm. with nitrogen to ensure minimal instrumental distortion of the spactral features. Care was also taken to observe any saturation of the absorption bands (which generally occur at peak absorptions greater than 40%) and omit any saturation distorted data. The band strengths were obtained directly from the slopes of Bear's law plots-integrated absorbance versus pressure-pathlength product $(\int -\ln (I/I0)d\nu vaP.L)$.