This question was asked recently. @dmckee and I both noted that it might work on chem.SE as well as here. I then stared reading through the physical-chemistry tag, found a few questions, including this one, which were (appropriately) closed as off topic. So I'm wondering, is there a good way to port these over there? I can't find a flag that I can use. Is there a good way to ping the user who asked the question? Is it acceptable for me to simply copy the question and ask it at Chem.SE if I understand it well enough?
The general way to get a question migrated is to flag for moderator attention or bring it up on meta. Migration is subject to some customary limits
We won't migrate without approval of the mods on the remove site unless we know that site very well.
In the case of a beta site we also rarely migrate open questions without the positive say-so of the OP.
Coping a closed question to a better site is not a problem, but migration is better insofar as it leaves a trail of breadcrumbs.
In the case of 24817, I'll ask the Chem mods.
One of the Chem mod says
Just a note, we don't exactly include chemE
but still accepted it for migration. Done.