Linewidths with gaussian and lorentzian broadening

Spin resonance lines occur which are broadened both by mechanisms giving a lorentzian shape and by mechanisms giving a gaussian shape It is often important to separate these contributions to the peak-to-peak separation of the derivative of the lineshape A simple and accurate expression is obtained to achieve this If Δ T is the observed peak-to-peak separation, and Δ L and Δ G are those of the lorentzian and gaussian components separately, then IMG1 is accurate to better than 0·01 Δ T for all Δ L and Δ G .