[Tex/LaTex] altering per-mode for a single siunitx-equation

math-modesiunitx

I am using siunitx in "per-mode=symbol", and that is working very well. However now I have run into an isolated case, where I need the "per"-symbol to be ^{-1}. Here is a MWE showing what I desire:

\documentclass[10pt]{article}

\usepackage[T1]{fontenc}
\usepackage{amsmath, amsthm, amssymb}
\usepackage[ansinew]{inputenc}
\usepackage[per-mode=symbol]{siunitx}

\begin{document}
\noindent A speed of $v=\SI{888}{\meter\per\second}$, this is fine. \\
\noindent A lifetime of $\Gamma=\SI{888}{\per\second}$, not OK. It should be 888 s$^{-1}$.

\end{document}

Is there a way to define for a single "instance" that it should not use per-mode=symbol?

Best Answer

The siunitx commands all take a first optional argument to apply settings locally. Thus you want

$\Gamma=\SI[per-mode=reciprocal]{888}{\per\second}$

here.

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