When taking Duschinsky-type phenomena into consideration, internal conversion can he altered by more than 50% in some cases. Some work has been done to incorporate these effects , the rate constant is expressed as a linear combination of matrix elements, where it is assumed that there is only one promoting mode and it is pure/unmixed. Mebel and co-workers first looked at internal conversion for the 1 B 1u → 1 A g transition in ethylene, and found two promoting modes, each with respective rate constant of between 1×10 6 -8×10 7 s -1 and 1×10 9 -1.26×10 10 s -1 , for a temperature range between 0-1500 K. They also examined the 1 B 1 → 1 A 1 internal conversion in allene, with a focus on the effect of Duschinsky vs. non-Duschinsky rates, and found that between the same temperature range, an increase by more than 50% can be observed as a function of temperature.