Hi everybody I have the following questions. It would be very nice if some of you could help understanding them.
1. What is the significance of chi-square in life time measurement?. Why should the value be lower than 1.2 if it has to be acceptable data? or can it be higher also depending upon the system under consideration, say for example aggregated species.
2. Why do the organic aggregates (say organic compound dissolved in THF and added to water to get the dispersion) give multiple decay values (for example 2 or 3) in the lifetime measurements?
Dear Peter Kapusta,
Thank you so much for your answers and now I am bit more clear about it. I will check the chapter you have mentioned here. Have a good day!!
To elaborate on Peter's answer on aggregates, when you have aggregates there are several effects that can be present. 1.) Some of you molecules are likely not aggregated due to aggregation equilibrium so you should see a lifetime consistent with individual molecules (if the aggregate particles don't change the mechanism/rate of quenching), additionally you may see two separate aggregate-based effects: Particles in aggregates may have longer lifetimes due to the fact that non-radiative decay rates may decrease, additionally if the aggregates can quench one another due to proximity you may see a short lifetime due to a new path (kq) competing. Finally something to note is that the aggregates may have slightly different environments on the molecular level due to how they are packed into these aggregates, this should mean that the lifetime of the aggregates is not a single value but a distribution of lifetime values. That being said, aggregates are still an incredibly way on predicting solid-state characteristics but they can be quite complicated.
Thank you so much Tyler Whittemore for your detailed answer. Now I have understood a bit more clearly from the answers of Peter Kapusta and you. Thank you both once again!
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