Microviscosity dependence of the Raman band shape of methyl-isobutyl ketone

The Raman band shape analysis of the CO stretching mode of vibration of methyl-isobutyl ketone in solution phase reveals that macroscopic consideration of hydrodynamic force is not sufficient to correlate the vibrational relaxation rate (τ_v⁻¹) with parameter ƒ(ϱ, η, n), involving dynamic viscosity (η). The band shape analysis was therefore attempted taking the microscopic parameter, microviscosity (η_m) into account through a modified parameter ƒ_m. The correlation of τ_v⁻¹ with ƒ_m is reported.