Raman spectra of n-pentane and isopentane in a methane environment

The present work focuses on the influence of CH4 environment on the changes in Raman spectra of n-C5H12 and i-C5H12 in the gaseous phase. It was found that in binary gas mixtures with an overwhelming content of CH4, the majority of the n-C5H12 and i-C5H12 Raman bands shifted toward lower wavenumbers. Moreover, there is also a redistribution of intensities between certain Raman bands of n-C5H12 and i-C5H12. The obtained results will be essential for Raman diagnostics of natural gas composition.