LaTeX Forum

\documentclass{scrartcl} 
\usepackage{tikz} 
\usetikzlibrary{decorations.pathmorphing,decorations.markings} 
\begin{document} 
\begin{tikzpicture}[
    >=latex,
    ep/.style={circle, ball color=gray!20}%Stil für die Elektronen und Protonen
  ] 
%Kern 
\node at (0,0) [ep](kern){+}; 
%K-Schale 
\draw[postaction=decorate,decoration={markings, 
  mark=at position .25 with {\node[ep](k1){-};}, 
  mark=at position .6 with {\node[ep](k2){-};} 
  }](0,0)circle(1cm); 
%L-Schale 
\draw[postaction=decorate,decoration={markings, 
  mark=at position .2 with {\node[ep](hub){-};}, 
  mark=at position .05 with {\node[ep](l1){-};}, 
  mark=at position .45 with {\node[ep](l2){-};}, 
  mark=at position .7 with {\node[ep](l3){-};}, 
  mark=at position .9 with {\node[ep](l4){-};} 
  }](0,0)circle(2cm); 
%freies Elektron 
\node at (-3,2)[ep](e){-}; 
%Pfeile 
\draw[->](e)--(k1)node[midway,above,sloped]{$\vec{F}$}; 
\draw[->](k1)to[bend left](hub); 
\draw[->](hub)to[bend left](k1);
\draw[->,decorate,
  decoration={snake,amplitude=.4mm,segment length=3mm,post length=3mm,
    pre=moveto,pre length=3mm},
  thick](k1)--(3,1.5)node[midway,above,sloped]{$W=h\cdot f$}; 
\end{tikzpicture} 
\end{document}

\documentclass[a4paper]{scrartcl}
\usepackage[ngerman]{babel}
\usepackage{tikz}
\usetikzlibrary{decorations.pathmorphing,decorations.markings}

\begin{document} 

\begin{tikzpicture}[>=latex]
%Kern
\node at (0,0) [shape=circle,ball color=gray!20](kern){+};
%K-Schale
\draw[postaction=decorate,decoration={markings,
 mark=at position .25 with {\node[shape=circle,ball color=gray!20](k1){-};},
 mark=at position .6 with {\node[shape=circle,ball color=gray!20](k2){-};}
 }](0,0)circle(1cm);
%L-Schale
\draw[postaction=decorate,decoration={markings,
 mark=at position .2 with {\node[shape=circle,ball color=gray!20](hub){-};},
 mark=at position .05 with {\node[shape=circle,ball color=gray!20](l1){-};},
 mark=at position .45 with {\node[shape=circle,ball color=gray!20](l2){-};},
 mark=at position .7 with {\node[shape=circle,ball color=gray!20](l3){-};},
 mark=at position .9 with {\node[shape=circle,ball color=gray!20](l4){-};}
 }](0,0)circle(2cm);
%freies Elektron
\node at (-3,2)[shape=circle,ball color=gray!20](e){-};
%Pfeile
\draw[->](e)--(k1)node[midway,above,sloped]{$\vec{F}$};
\draw[->](k1)to[bend left](hub);
\draw[->](hub)to[bend left](k1);
\draw[->,decorate,decoration={snake,amplitude=.4mm,segment length=3mm,post length=3mm},thick](k1)--(3,1.5)node[midway,above,sloped]{$W=h\cdot f$};
\end{tikzpicture}

\end{document}