Infrared absorption spectrum of methane from 2470 to 3200 cm-1

Abstract

The absorption spectrum of methane has been measured from 2470 to 3200 cm^-1 with a high-resolution infrared spectrometer. Pressures from 0.01 to 4.5 cm of the gas were used in order to observe both intense and weak lines. A total of 2,460 lines were measured in the entire region. The <i>v</i> ₃ band at 3018 cm^-1 was measured at very slow scanning rates and the lines of the <i>P</i> and <i>R</i> branches were resolved into several components. The observed spectrum is shown in five figures.