Energy levels of a fluor molecule

In particle physics, the most important experimental problem is that of detecting particles. A cheap and highly efficient solution is using scintillators. These kinds of detectors emit light when a charged particle traverses the detector. The light-emitting process is depicted in this figure. The layout was inspired by [this wikipedia graphic](http://en.wikipedia.org/wiki/File:Pistates.svg). The TikZ code in my version is a bit complex, mainly due to manual layout tweaks, shifting some positions here and there. The figure shown here is a minor revision of the one included in [my PhD thesis](http://dx.doi.org/10.3990/1.9789036534383).

Edit and compile if you like:

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% Energy levels of a fluor molecule
% Author: David Fokkema
\documentclass{article}
\usepackage{tikz}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{center}
\setlength\PreviewBorder{10pt}%
\usetikzlibrary{calc,arrows,decorations.pathmorphing,intersections}
\usepackage[font={small,sf},labelfont={bf},labelsep=endash]{caption}
\usepackage{sansmath}
\begin{document}
\begin{center}
  \sansmath
  \begin{tikzpicture}[
    font=\sffamily,
    level/.style={black,thick},
    sublevel/.style={black,densely dashed},
    ionization/.style={black,dashed},
    transition/.style={black,->,>=stealth',shorten >=1pt},
    radiative/.style={transition,decorate,decoration={snake,amplitude=1.5}},
    indirectradiative/.style={radiative,densely dashed},
    nonradiative/.style={transition,dashed},
  ]
  \coordinate (sublevel) at (0, 8pt);
  % Singlet levels
  \coordinate (S00) at (0, -1);
  \coordinate (S01) at ($(S00) + (sublevel)$);
  \coordinate (S02) at ($(S00) + 2*(sublevel)$);
  \coordinate (S03) at ($(S00) + 3*(sublevel)$);
  \coordinate (S10) at (0, 3);
  \coordinate (S11) at ($(S10) + (sublevel)$);
  \coordinate (S12) at ($(S10) + 2*(sublevel)$);
  \coordinate (S13) at ($(S10) + 3*(sublevel)$);
  \coordinate (S20) at (0, 4.5);
  \coordinate (S21) at ($(S20) + (sublevel)$);
  \coordinate (S22) at ($(S20) + 2*(sublevel)$);
  \coordinate (S30) at (0, 6);
  % Draw main levels
 
 
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