Umlauts are not Wikifiable. Meaning you can't put brackets around it and make it a link. Same goes for most special characters. --MemoryHole.com
You can make it display, just not actually link: [[Mossbauer Spectroscopy|Mössbauer Spectroscopy]] links to the first term and displays the second, like so: Mössbauer Spectroscopy. The linking is supposed to be resolved I think with .92, but I'm not sure. --KQ