I suppose $^{foo}$ will do what you want. you may need some additional
\mathrm command if you do not want math fonts.
or maybe try \textsuperscript{foo}
(untested)
Andreas Leha writes:
> Hi all,
>
> quick question: What is the syntax of superscripts without a 'base
> character'?
>
> I tried to use ^{foo} and {}^{foo} which both do not produce what I
> expect in the latex export.
>
> \nbsp^{foo} comes close.
>
> Best,
> Andreas
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