John Wheeler jcw at chemj2.ucsd.edu
Tue Mar 28 19:29:36 CEST 2006

The Faraday is now often written as just F.
It has also often been represented by a capital script F.
Try this:

\documentclass[12pt]{article}
\usepackage{amssymb,amsfonts,amsmath}
\usepackage[mathscr]{euscript}
\newcommand{\ScrF}{{\mathscr{F}}}
\begin{document}
$\ScrF$
\end{document}

(I'm not sure everything I've included needs to be; I already stripped out
a lot of unnecessary things that were in a file where I was experimenting
with getting other letters that I wanted for similar purposes.)

John Wheeler
jcw at chemj2.ucsd.edu