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@ -1266,7 +1266,7 @@ Large $U$ can be physically interpreted as strong electron repulsion effects in
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In contrast, smaller $\epsilon$ gives a weaker attraction to the atomic site,
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representing strong screening of the nuclear attraction by core and valence electrons,
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and again a less negative $\lambda$ is required for ionisation to occur.
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Both of these factors are common in atoms on the right-hand side of the periodic table, \eg\ \ce{F},
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Both of these factors are common in atoms on the right-hand side of the periodic table, \eg, \ce{F},
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\ce{O}, \ce{Ne}.
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Molecules containing these atoms are therefore often class $\beta$ systems with
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a divergent RMP series due to the MP critical point. \cite{Goodson_2004,Sergeev_2006}
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@ -1324,9 +1324,9 @@ connection to MP critical points and QPTs (see Sec.~\ref{sec:MP_critical_point})
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For $\lambda>1$, the HF potential becomes an attractive component in Stillinger's
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Hamiltonian displayed in Eq.~\eqref{eq:HamiltonianStillinger}, while the explicit electron-electron interaction
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becomes increasingly repulsive.
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Closed--shell critical points along the positive real $\lambda$ axis then represent
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Closed-shell critical points along the positive real $\lambda$ axis then represent
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points where the two-electron repulsion overcomes the attractive HF potential
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and a single electron dissociates from the molecule (see Ref.~\onlinecite{Sergeev_2006})
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and a single electron dissociates from the molecule (see Ref.~\onlinecite{Sergeev_2006}).
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In contrast, symmetry-breaking in the UMP reference creates different HF potentials for the spin-up and spin-down electrons.
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Consider one of the two reference UHF solutions where the spin-up and spin-down electrons are localised on the left and right sites respectively.
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