Dianion formation from anion-alkali metal charge exchange reactions: TCNQ$^{-}$ + Na $\to $ TCNQ$^{--}$ + Na$^{+}$

POSTER

Abstract

The interaction of an electron with an anion is characterized by a long-range coulomb repulsion and a short range polarizability attraction giving rise to a coulomb barrier. The permanent addition of an extra electron to a negatively charged anion requires tunneling through the barrier or attachment of the electron over the top of this coulomb barrier followed by disposal of the excess energy. Charge-exchange collisions of an anion with an alkali atom utilize the latter channel to produce permanent dianions with cross sections of $\sim $1 {\AA}$^{2}$. We have previously examined the reaction TCNQ-F$_{4}^{-}$ + Xe $\to $ TCNQ-F$_{4}^{--}$ + Xe$^{+}$ and reported a delayed threshold and quantum phase interference effects in the charge exchange cross section.\footnote{S. Yu. Ovchinnikov, et al. Phys. Rev. A, 73, 64704(2006)} Employing sodium as the collision partner, the cross section is seen to increase with decreasing energy with a threshold below 180 eV (com). A new apparatus has been constructed to allow measurements down to energies below the expected threshold ($\sim $41 eV, laboratory energy based upon a 1 eV second electron affinity). This method has been used to study the reaction TCNQ$^{-}$ + NA $\to $ TCNQ$^{--}$ + Na$^{+}$ and will provide one of the first measurements of second electron affinities for molecular anions.

Authors

  • Byron Smith

    University of Tennessee

  • Rahul Kulkarni

    Materials and Structures Laboratory, Tokyo Institute of Technology, Jefferson Lab, 12000 Jefferson Avenue, MS 58, Suite 17, Newport News, VA 23606, VirginiaTech, Department of Physics, University of South Alabama, New York University, University of Tennessee Knoxville, Georgia College, North Georgia College \& State Univ., North Carolina Central University, TUNL, James Madison University, Physics Department, Hollins University; JQI, University of Aarhus, University of Tennessee, UNC at Asheville, The College of New Jersey, CERN, Florida Institute of Technology, Mechanical Engineering Department, University of New Mexico, Department of Physics, Florida State University, JINR, Vanderbilt, Tsinghua University, LBNL, Vanderbilt and LBNL, Vanderbilt University, Vanderbilt University, Tsinghua University, Vanderbilt University, LBNL, NBPHS, Vanderbilt University, Dept. of Physics and Astronomy - James Madison University, National High Magnetic Field Laboratory, U. of South Alabama Dept. of Chemistry, U. of South Alabama Dept. of Physics, Ohio State University, Wright State University, Engineering Science and Mechanics, Virginia Tech, US, Department of Nanobio Materials and Electronics, GIST, Republic of Korea, Department of Physics, Virginia Tech

  • Rahul Kulkarni

    Materials and Structures Laboratory, Tokyo Institute of Technology, Jefferson Lab, 12000 Jefferson Avenue, MS 58, Suite 17, Newport News, VA 23606, VirginiaTech, Department of Physics, University of South Alabama, New York University, University of Tennessee Knoxville, Georgia College, North Georgia College \& State Univ., North Carolina Central University, TUNL, James Madison University, Physics Department, Hollins University; JQI, University of Aarhus, University of Tennessee, UNC at Asheville, The College of New Jersey, CERN, Florida Institute of Technology, Mechanical Engineering Department, University of New Mexico, Department of Physics, Florida State University, JINR, Vanderbilt, Tsinghua University, LBNL, Vanderbilt and LBNL, Vanderbilt University, Vanderbilt University, Tsinghua University, Vanderbilt University, LBNL, NBPHS, Vanderbilt University, Dept. of Physics and Astronomy - James Madison University, National High Magnetic Field Laboratory, U. of South Alabama Dept. of Chemistry, U. of South Alabama Dept. of Physics, Ohio State University, Wright State University, Engineering Science and Mechanics, Virginia Tech, US, Department of Nanobio Materials and Electronics, GIST, Republic of Korea, Department of Physics, Virginia Tech

  • Rahul Kulkarni

    Materials and Structures Laboratory, Tokyo Institute of Technology, Jefferson Lab, 12000 Jefferson Avenue, MS 58, Suite 17, Newport News, VA 23606, VirginiaTech, Department of Physics, University of South Alabama, New York University, University of Tennessee Knoxville, Georgia College, North Georgia College \& State Univ., North Carolina Central University, TUNL, James Madison University, Physics Department, Hollins University; JQI, University of Aarhus, University of Tennessee, UNC at Asheville, The College of New Jersey, CERN, Florida Institute of Technology, Mechanical Engineering Department, University of New Mexico, Department of Physics, Florida State University, JINR, Vanderbilt, Tsinghua University, LBNL, Vanderbilt and LBNL, Vanderbilt University, Vanderbilt University, Tsinghua University, Vanderbilt University, LBNL, NBPHS, Vanderbilt University, Dept. of Physics and Astronomy - James Madison University, National High Magnetic Field Laboratory, U. of South Alabama Dept. of Chemistry, U. of South Alabama Dept. of Physics, Ohio State University, Wright State University, Engineering Science and Mechanics, Virginia Tech, US, Department of Nanobio Materials and Electronics, GIST, Republic of Korea, Department of Physics, Virginia Tech

  • Rahul Kulkarni

    Materials and Structures Laboratory, Tokyo Institute of Technology, Jefferson Lab, 12000 Jefferson Avenue, MS 58, Suite 17, Newport News, VA 23606, VirginiaTech, Department of Physics, University of South Alabama, New York University, University of Tennessee Knoxville, Georgia College, North Georgia College \& State Univ., North Carolina Central University, TUNL, James Madison University, Physics Department, Hollins University; JQI, University of Aarhus, University of Tennessee, UNC at Asheville, The College of New Jersey, CERN, Florida Institute of Technology, Mechanical Engineering Department, University of New Mexico, Department of Physics, Florida State University, JINR, Vanderbilt, Tsinghua University, LBNL, Vanderbilt and LBNL, Vanderbilt University, Vanderbilt University, Tsinghua University, Vanderbilt University, LBNL, NBPHS, Vanderbilt University, Dept. of Physics and Astronomy - James Madison University, National High Magnetic Field Laboratory, U. of South Alabama Dept. of Chemistry, U. of South Alabama Dept. of Physics, Ohio State University, Wright State University, Engineering Science and Mechanics, Virginia Tech, US, Department of Nanobio Materials and Electronics, GIST, Republic of Korea, Department of Physics, Virginia Tech