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I would like to create an equation where 2nd equation is inupt to the first one. I want to write the equation in a figure.

enter image description here

I try using long arrow a

\begin{align}
%\begin{split}
         \rightarrow  \dotr{R}+O_2  &\longrightarrow \dotr{R00}
  %\end{split}
     \label{}
\end{align}

\begin{align}
%\begin{split}
         \dotr{R00} + RH &\longrightarrow ROOH + \dotr{R} \bigg\uparrow
  %\end{split}
     \label{}
\end{align}
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6
  • See tex.stackexchange.com/questions/134773/… for example. Or tex.stackexchange.com/questions/86188/….
    – Bibi
    Jul 22, 2020 at 13:25
  • please upload your code as a MWE
    – js bibra
    Jul 22, 2020 at 13:35
  • \begin{align} %\begin{split} \rightarrow \dotr{R}+O_2 &\longrightarrow \dotr{R00} %\end{split} \label{} \end{align} \begin{align} %\begin{split} \dotr{R00} + RH &\longrightarrow ROOH + \dotr{R} \bigg\uparrow %\end{split} \label{} \end{align}
    – WBAN_crypto
    Jul 22, 2020 at 13:40
  • your code does not compile
    – js bibra
    Jul 22, 2020 at 14:23
  • 1
    Where does the \dotr command come from?
    – Bernard
    Jul 22, 2020 at 14:41

2 Answers 2

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2

The equation in the figure is a chemical equation. Using Bernard's answer and the mhchem package (useful for writing chemical formulas, etc.), following is the code which you may use. The mhchem package takes care of the radical dots in the chemical equation.

\documentclass{article}

\usepackage{amsmath}
\usepackage{pst-node}

\usepackage[version=4, arrows=pgf-filled]{mhchem}

\begin{document}

\begin{align}
    &\rnode{R1}{\ce{R^{.}}} + \ce{O2 -> ROO^{.}} \\
    &\ce{ROO^{.} + RH ->}\rnode{R2}{\ce{R^{.}}}
    %
    \psset{linewidth=0.5pt, arrows=<-, arrowinset=0.5, nodesep=2pt}
    \ncloop[angleA=180, armA=1cm, angleB=-90, armB=0.20cm, linearc=0]{R1}{R2}%
\end{align}
\end{document}

chem quation with radical dots

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6
  • thank you for the reply. The bottom arrow is not appearing similarly to the previous answer.
    – WBAN_crypto
    Jul 22, 2020 at 17:57
  • I am using my university class file
    – WBAN_crypto
    Jul 22, 2020 at 18:03
  • How are you compiling the code? Compile the code using XeLaTeX or do this LaTex (x2) -> DVItoPS -> PStoPDF.
    – Tanvir
    Jul 22, 2020 at 21:40
  • I am using overleaf
    – WBAN_crypto
    Jul 23, 2020 at 13:17
  • In Overleaf, from setting menu, change the compiler from pdfLaTex to XeLaTex. You can get the settings by clicking the menu at the top left of Overleaf.
    – Tanvir
    Jul 23, 2020 at 13:32
4

You can use the \ncloop command from pst-node:

\documentclass{article}

\usepackage{amsmath}
\newcommand{\dotr}[1]{#1^{\bullet}}
\usepackage{pst-node}

\begin{document}

\begin{align}
    \rnode{R1}{ \dotr{\mathrm{R}}}+\mathrm{O}_2 &\longrightarrow \dotr{\mathrm{ROO}}\\
     \dotr{\mathrm{ROO}} + \mathrm{RH} &\longrightarrow \mathrm{ROOH} +\dotr{ \rnode{R2}{\mathrm{R}}}
    %
    \psset{linewidth=0.5pt, arrows=<-, arrowinset=0.2, nodesep=2pt}
    \ncloop[angleA=180, armA=1cm, angleB=-90, armB=0.20cm, linearc=0.05]{R1}{R2}%
 \label{}
\end{align}

\end{document}

enter image description here

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2
  • thank you very much for your reply. I don't know why the bottom arrow is not appearing in my document. Do I need to add any other package? thanks.
    – WBAN_crypto
    Jul 22, 2020 at 17:56
  • I am using my university article class
    – WBAN_crypto
    Jul 22, 2020 at 18:02

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