mhchem 中的宏吗？

Question

我想经常写羟基自由基，所以我想到做一个小宏。但是使用宏，文本在mhchem包中不会被处理为化合物。考虑以下 MWE：

\documentclass{standalone}

\usepackage[version=3]{mhchem}
\usepackage{amsmath}

\newcommand\ohrad{OH^{.}}

\begin{document}

This is with the macro \ce{\ohrad}, this is without the macro \ce{OH^{.}}

\end{document}

和输出

Answer 1

并且根据 @cgnieder 的说法，它应该可以使用\cf{}。并且确实如此：

\documentclass{standalone}

\usepackage[version=3]{mhchem}
\usepackage{amsmath}

\newcommand\ohrad{\cf{OH^{.}}}

\begin{document}

This is with the macro \ce{\ohrad}, this is without the macro \ce{OH^{.}}

\end{document}

输出

Answer 2

这会添加一个前缀，导致以下宏在扫描\^时被扩展（一次） 。\ce

\documentclass{standalone}

\usepackage[version=3]{mhchem}
\makeatletter
\let\old@mhchem@ce@i\mhchem@ce@i
\def\mhchem@ce@i{%
\ifx\mhchem@ce@lookahead\^%
   \expandafter\mhc@expand
\else
   \expandafter\old@mhchem@ce@i
\fi}
\def\mhc@expand\^{\expandafter\mhchem@ce@continue}
\makeatother
\usepackage{amsmath}

\newcommand\ohrad{OH^{.}}

\begin{document}


This is with the macro \ce{\^\ohrad}, this is without the macro \ce{OH^{.}}

\end{document}