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latex loop back formula arrow

TeX - LaTeX Asked by WBAN_crypto on July 23, 2020

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} bigguparrow
  %end{split}
     label{}
end{align}

2 Answers

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

Answered by Bernard on July 23, 2020

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

Answered by Tanvir on July 23, 2020

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