Hi @LukeSeifert, thanks for reporting this.
The warn message you’re seeing is definitely misleading. What is set to 0.0 is not the transfer rate of the element you’ve defined but for all other elements present in the material, for which, as expected, a null transfer rate gets set. Don’t even know why is there and will be removed. Note however that the transfer rate for Xenon from material 1 to 2 gets set correctly as you’ve defined as the results you’ve plot suggests.
Thanks again.
Lorenzo
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