[Tex/LaTex] widetext equation in revtex4 messed up

equationsrevtex

I have stumbled upon a problem. I have a seminar I'm working on, and I'm writing it in revtex4 two column mode.

I already used one widetext environment and the equation came out nicely. So I repeated the process, and it overlaps other, non widetext equation :
The code is:

Vidimo kako povećavamo p, odnosno kako prelazimo u limes beskonačne jame, varijaciona metoda nam daje lošije procjene za eneriju osnovnog stanja. Energetska stanja rastu, no drastičnije od numeričkih rezultata. To je vjerojatno posljedica postojanja gama funkcije u izrazu koja kako uzimamo veće vrijednosti drastično raste. Usporedbom slika dobivenih diskretizacijom vidimo da ovakva valna funkcija najbolje odgovara 'mekšim' potencijalima, dok za beskonačnu potencijalnu jamu imamo kosinusno rješenje koje najbolje opisuje osnovno stanje. Također moramo uzeti u obzir da kod beskonačne jame nema tuneliranja u klasično zabranjeno područje. Najbolje poklapanje imamo za potencijal harmoničkog oscilatora, no to nas ne bi trebalo iznenaditi jer je izraz za osnovno stanje harmoničkog oscilatora (uz $\hbar=\omega=m=1$): $\psi_0(x)=\pi^{-1/4}\exp[-x^2/2]$.\\

Druga probna valna funkcija je oblika:

\begin{equation}
\varphi_2(x)=b\sqrt{\frac{2b}{\pi}}\frac{1}{x^2+b^2}
\end{equation}

\begin{figure}[htp]
\centering
\includegraphics[clip,scale=0.3]{valfun2.eps}
\caption{Probna valna funkcija $\varphi_2(x)$.}
\label{fig:probvalf2}
\end{figure}

Valna funkcija (slika \ref{fig:probvalf2}) je također normirana te ovisi o proizvoljnom, pozitivnom parametru b.

\begin{equation}
\begin{split}
E(b)&=\int\limits_{-\infty}^{\infty}\varphi_2^*(x)\left(-\frac{1}{2}\frac{d^2}{dx^2}+x^{2p}\right)\varphi_2(x)\ dx=\\
&=\frac{2b^3}{\pi}\int\limits_{-\infty}^{\infty}\left\{\frac{1}{x^2+b^2}\left[-\frac{1}{2}\left(-\frac{2 \left(b^2-3x^2\right)}{\left(b^2+x^2\right)^3}\right)\right.\right.+\\
&+\left.\left.\frac{x^{2p}}{x^2+b^2}\right]\right\}=\\
&=\frac{1}{4b^2}+(-1)^p\frac{b^{2p}}{2}(1-2p)
\end{split}
\label{eq:Eb2}
\end{equation}

Iz uvjeta minimuma \ref{eq:uvjmin} imamo:

\begin{equation}
b_0=2^{\frac{1}{-2-2p}}\left((-1)^p p(1-2p)\right)^{\frac{1}{-2-2p}}
\end{equation}

Što, ako vratimo u izraz za očekivanu vrijednost energije \ref{eq:Eb2}, daje:

\begin{widetext}
\begin{equation}
\begin{split}
E(b_0)=\frac{1}{4} \left(2 (-1)^p (1-2 p) \left(2^{\frac{1}{-2 p-2}} \left((-1)^p (1-2 p)
   p\right)^{\frac{1}{-2 p-2}}\right)^{2 p}+2^{\frac{1}{p+1}} \left((-1)^p (1-2 p)
   p\right)^{\frac{1}{p+1}}\right)
\end{split}
\end{equation}
\end{widetext}

And I get this:

enter image description here
enter image description here

I don't know why it leaves such big empty space between some equations :
Oh the preambule is:

\documentclass[twocolumn,pre,floats,aps,amsmath,amssymb]{revtex4}

\usepackage{graphicx}
\usepackage{bm}
\usepackage[croatian]{babel}
\usepackage{ucs}
\usepackage[utf8x]{inputenc}
\usepackage[dvipdfm,colorlinks=true,bookmarks=false,urlcolor=blue,citecolor=blue,linkcolor=red,pdfstartview={XYZ null null 1.00}]{hyperref}
\usepackage{extarrows}
\usepackage{subfigure}
\usepackage{caption}
\usepackage{mathtools}
\usepackage{bbm}
\usepackage{wrapfig}
\usepackage{graphicx}
\usepackage{float}
\usepackage{url}
\usepackage[all]{hypcap}
\usepackage{subfigure}
\usepackage{color}
\usepackage{xcolor}
\usepackage{listings}
\usepackage{array}

\DeclareCaptionFont{white}{\color{white}}
\DeclareCaptionFormat{listing}{\colorbox{gray}{\parbox{\textwidth}{#1#2#3}}}
\captionsetup[lstlisting]{format=listing,labelfont=white,textfont=white}
\newcolumntype{y}[1]{>{\centering\let\newline\\\arraybackslash\hspace{0pt}}p{#1}}
\renewcommand*{\arraystretch}{1.2}

The part that looks fine, looks like this:
enter image description here

Ignore the text, it's irrelevant… Why does this happen? :

Best Answer

I had a similar issue with a widetext environment overlapping an equation environment, I solve it using \begin{align}...\end{align} instead of \begin{equation}...\end{equation} for the overlapped equation, in your case try

\begin{align}
E(b)&=\int\limits_{-\infty}^{\infty}\varphi_2^*(x)\left(-\frac{1}{2}\frac{d^2}{dx^2}+x^{2p}\right)\varphi_2(x)\ dx=\\
&=\frac{2b^3}{\pi}\int\limits_{-\infty}^{\infty}\left\{\frac{1}{x^2+b^2}\left[-\frac{1}{2}\left(-\frac{2 \left(b^2-3x^2\right)}{\left(b^2+x^2\right)^3}\right)\right.\right.+\\
&+\left.\left.\frac{x^{2p}}{x^2+b^2}\right]\right\}=\\
&=\frac{1}{4b^2}+(-1)^p\frac{b^{2p}}{2}(1-2p)
\label{eq:Eb2}
\end{align}