活性化エネルギー

\documentclass[b5j,9pt,twoside]{tetsujsarticle}
\usepackage{tetsuchem}
\pagestyle{fancy}

\余白設定[
上余白=0truecm,
下余白=上余白,
左余白=0truecm,
左右差=0truecm,
段間隔=対称,
段組の仕切り線の太さ=.5truept,
ヘッダの縦幅=5truept,
ヘッダ下端と本文上端の縦間隔=0truept,
ヘッダと本文を仕切る線の太さ=0truept,
本文下端とフッタ下端の縦間隔=0truept,
本文とフッタを仕切る線の太さ=0truept,
傍注領域の幅=0truept,
本文端と傍注領域との間隔=0truept,
傍注同士の縦間隔=\baselineskip,
奇数ページの傍注位置=右,
偶数ページの傍注位置=左,
]

\カスタム用紙サイズ{縦=5.5cm,横=11cm}

\begin{document}

\begin{tikzpicture}[>=stealth]
\draw (0,2) -- (3.5,2) -- (4,3.75) -- (6,3.75) -- (7,0) -- (11.5,0);
\node[above] at (1,2) {反応物};
\node[above] at (5,3.75) {活性化状態};
\node[above] at (10,0) {生成物};
\draw[<->,very thick] (3,2.2) -- (3,3.75) node[midway,right,yshift=-5pt] {$E_1$};
\node at (2.75,3.4) {\parboxx{\baselineskip=0pt 活性化\\\ihspace{0.5zw}エネルギー}};
\draw[<->,very thick] (3,0) -- (3,1.8) node[midway,right] {反応熱$Q$};
\draw[<->,very thick] (7.5,0.2) -- (7.5,3.75) node[midway,right] {\parboxx{\baselineskip=0pt 逆反応の\\活性化\\エネルギー\\$E_2$}};
\node at (0.65,3.25) {\mbox{\tate Ｈ\raisebox{1pt}{$-$}Ｈ}};
\node at (1.3,3.25) {\mbox{\tate Ｉ\raisebox{1pt}{$-$}Ｉ}};
\draw (0.675,3.25) arc(-85:265:0.25) arc(95:445:0.25);
\draw (1.37,3.25) arc(-80:260:0.35) arc(100:440:0.35);
\node at (10,0.9) {\ce{H - I}};
\node at (10,1.75) {\ce{H - I}};
\draw (10,1.93) arc(45:315:0.25) arc(-150:150:0.35);
\draw (10,1.08) arc(45:315:0.25) arc(-150:150:0.35);
\node (h1) at (4.8,5.1) {H};
\node (h2) at (4.8,4.65) {H};
\node (i1) at (5.4,5.2) {I};
\node (i2) at (5.4,4.55) {I};
\draw[densely dotted] (h1) -- (h2) -- (i2) -- (i1);
\draw[densely dotted] (h1) -- (i1);
%\draw (h1) circle(0.25);
%\draw (h2) circle(0.25);
%\draw (i1) circle(0.375);
%\draw (i2) circle(0.375);
\draw ($(h1)+(-114:0.25)$) arc(246:25:0.25) arc(179:-60:0.375) arc(60:-179:0.375) arc(-25:-246:0.25);
\draw ($(h1)+(-66:0.25)$) arc(-66:-5.5:0.25) arc(-161:-120:0.375) arc(120:161:0.375) arc(5.5:66:0.25);
\end{tikzpicture}

\end{document}