convert pair styles hbond to lebedeva

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\begin{eqnarray*}

 E & = & \left[LJ(r) | Morse(r) \right] \qquad \qquad \qquad r < r_{\rm in} \\

   & = & S(r) * \left[LJ(r) | Morse(r) \right] \qquad \qquad r_{\rm in} < r < r_{\rm out} \\

   & = & 0 \qquad \qquad \qquad \qquad \qquad \qquad \qquad r > r_{\rm out} \\

 LJ(r) & = & AR^{-12}-BR^{-10}cos^n\theta=

         \epsilon\left\lbrace 5\left[ \frac{\sigma}{r}\right]^{12}-

         6\left[ \frac{\sigma}{r}\right]^{10}  \right\rbrace cos^n\theta\\

 Morse(r) & = & D_0\left\lbrace \chi^2 - 2\chi\right\rbrace cos^n\theta=

         D_{0}\left\lbrace e^{- 2 \alpha (r - r_0)} - 2 e^{- \alpha (r - r_0)} 

         \right\rbrace cos^n\theta \\

 S(r) & = & \frac{ \left[r_{\rm out}^2 - r^2\right]^2  

   \left[r_{\rm out}^2 + 2r^2 - 3{r_{\rm in}^2}\right]} 

 { \left[r_{\rm out}^2 - {r_{\rm in}}^2\right]^3 }

\end{eqnarray*}

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\begin{eqnarray*}

  E & = & \frac{1}{2} \sum_i \sum_{j \neq i} V_{ij} \\[15pt]

  V_{ij} & = & {\rm Tap}(r_{ij})\left \{ e^{-\alpha (r_{ij}/\beta -1)} 

               \left [ \epsilon + f(\rho_{ij}) + f(\rho_{ji})\right ] - 

                \frac{1}{1+e^{-d\left [ \left ( r_{ij}/\left (s_R \cdot r^{eff} \right ) \right )-1 \right ]}}

                \cdot \frac{C_6}{r^6_{ij}} \right \}\\[15pt]

  \rho_{ij}^2 & = & r_{ij}^2 - ({\bf r}_{ij} \cdot {\bf n}_i)^2 \\[15pt]

  \rho_{ji}^2 & = & r_{ij}^2 - ({\bf r}_{ij} \cdot {\bf n}_j)^2 \\[15pt]

  f(\rho) & = &  C e^{ -( \rho / \delta )^2 }\\[15pt]

  {\rm Tap}(r_{ij}) & = & 20\left ( \frac{r_{ij}}{R_{cut}} \right )^7 -

                          70\left ( \frac{r_{ij}}{R_{cut}} \right )^6 +

                          84\left ( \frac{r_{ij}}{R_{cut}} \right )^5 -

                          35\left ( \frac{r_{ij}}{R_{cut}} \right )^4 + 1

\end{eqnarray*}

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