3ν3 band of 12CH4 at 1.1 μ

Abstract

The 3ν₃ absorption band of ¹²CH₄ has been measured using a high resolution vacuum infrared spectrometer. A technique is described which allows an extension of the use of the absorption standards available at 4.7 μ to the photomultiplier region of the spectrum. The new measurements indicate a shift of about 0.18 cm⁻¹ from the most recently published measurements of this band.