Studies on the Instrumental Factors Determining Errors in the Measurements of Raman Band Profiles. Part II: Effect of the Signal Noise on Vibrational Relaxation Functions and Relaxation Times

A method for the determination of the effect of the signal noise on vibrational correlation functions and relaxation times obtained in stationary spectroscopic measurements is proposed. It rests upon the assumption that electronic noise is mainly due to the photon counting which, for fast electronics, is described by Poisson statistics. The application of this method leads to results expressed as standard deviations which, for correlation functions, appear in very close agreement with the conclusions of statistical analysis, while for the relaxation times the results are lower than those delivered by statistical analysis.