Measured Absolute Cross Section of Charge Transfer in H$+$H$_{2}^{+}$ at Low Energy: Signature of v$_{i} \quad =$ 2 and Trajectory Effects$^{1}$

Measurements of absolute cross sections of charge transfer (CT) in H $+$ H$_{2}^{+}\to $ H$^{+} \quad +$ H$_{2}$~were conducted at the merged-beam apparatus at Oak Ridge National Laboratory (ORNL) in Oak Ridge, Tennessee, which can reliably create and access collision energies as low as 0.1eV/u. The measured absolute cross section shows evidence of trajectory effects at low energy. Also, the comparison to state-to-state calculations (PRA \textbf{67} 022708 (2003) suggests a strong contribution from v$_{i} \quad =$ 2 of the H$_{2}^{+}$ that are produced by the electron cyclotron resonance ion source. The data analysis will be presented here. \newline \newline $^{1}$Research supported by the NASA Solar {\&} Heliospheric Physics Program NNH07ZDA001N, the Office of Fusion Energy Sciences and the Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the U.S. Department of Energy, the National Science Foundation through Grant No. PHY-1068877