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einsteinAB.tex
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einsteinAB.tex
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\documentclass{standalone}
%\pagenumbering{gobble}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% schematic of two level diagram
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{tikz}
\usetikzlibrary{arrows,snakes}
\begin{document}
\tikzset{
level/.style={thick},
trans/.style={thick, dashed, ->, shorten >=2pt,shorten <=2pt,>=stealth},
photon/.style={thick, ->, snake=snake, line after snake=1mm}
}
\begin{tikzpicture}[scale=1.0, font=\sffamily]
% Draw the energy levels
\draw[level] (7.5,0) -- (0,0) node[left] {1};
\draw[level] (7.5,3) -- (0,3) node[left] {2};
% Draw the transitions
\draw[trans] (1.5,0) -- (1.5,3);
\node[align=center] at (1.3,3.2) {\small{Absorption}};
\draw[trans] (3.0,3) -- (3.0,0);
\node[align=center] at (3.2,3.2) {\small{Emission}};
\draw[trans] (5.2,3) -- (5.2,0);
\node[align=center] at (5.4,3.2) {\small{Stimulated}};
% Draw the photons
\draw[photon] (0,2.1) -- (1.45,2.1);
\node[align=left] at (0.3,2.4) {\small{$B_{12}J_{\rm line}$}};
\draw[photon] (3.0,1.8) -- (4.5,1.8) node[above] {\small{$A_{21}$}};
\draw[photon] (4.45,1.0) -- (5.95,1.0);
\draw[photon] (5.2,0.7) -- (6.7,0.7) node[below] {\small{$B_{21}J_{\rm line}$}};
\end{tikzpicture}
\end{document}