Squares Analysis of Frequency-Domain Intensity Decays

Least-Squares Analysis of Frequency-Domain Intensity Decays 

We now describe the analysis used to recover the intensity decay paramet s from the frequency response of the emis- 

For a multiexponential decay, J Oi v, which is proportional to the steady-state intensity of the samite. Because of this normalization factor, one can always frx one of the anqrlitudes (Or or fi) in the analysis of FD data. The calculated frequency-dependent values of the phase angle (0cu) and the ifemodulation (m g) are given by 

The parameters (oti and v) are varied to yield the best fit between the data and the calculated values, as indicated by a minimum value for the goodness-of-fit parameters xi. 

The correctness of a model is judged based on the values of For an appropri model and random noise, xJ U expected to be near unity. greater than unity, then 

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A. Least-Squares Analysis of Frequency-Domain Intensity Decays... 

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