τ is the time constant for each decay term, TMax the maximum ΔT achieved and A the relative contribution of each term to the overall cooling curve. The fit parameters for each temperature are given in the ESI, Section 7. The first exponential fit to a time constant of ca. 0.7 ms accounted for the majority (~ 70%) of the cooling in each case. The second term, still significant, represents a slower cooling process (time constant ca. 6.4 ms). The samples at 80 and 100 °C exhibit deviations from the trends observed at higher starting temperatures, with slower cooling and larger values of τ. To explain why the cooling is bi-exponential, in the next section we examine the temperature distribution within the laser-pumped zeolite sample.