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The $^{2}$H$(e,e'p)n$ cross sections have been measured at negative4-momentum transfers of $Q^{2} = 4.5\pm0.5$ (GeV/c)$^{2}$ and $Q^{2} =3.5\pm0.5$ (GeV/c)$^{2}$ reaching neutron recoil (missing) momenta up to$p_{\mathrm{r}}\sim$1.0 GeV/c. The data have been obtained at fixed neutronrecoil angles $5^{\circ}\leq\theta_{nq}\leq95^{\circ}$ with respect to the3-momentum transfer $\vec{q}$. The new data agree well with the previous datawhich reached $p_{\mathrm{r}}\sim550$ MeV/c. At $\theta_{nq}=35^{\circ}$ and$45^{\circ}$, final state interactions (FSI), meson exchange currents (MEC) andisobar configurations (IC) are suppressed and the plane wave impulseapproximation (PWIA) provides the dominant cross section contribution. The newdata are compared to recent theoretical calculations, and a significantdisagreement for recoil momenta $p_{\mathrm{r}}>700$ MeV/c is observed.

Cross Section Measurements of Deuteron Electro-Disintegration at Very High Recoil Momenta and Large 4-Momentum Transfers ($Q^{2}$)