Rainer Johnsen

  • Professor Emeritus
115 OEH
rj@pitt.edu

Research

Experimental low–energy atomic collision physics, ion–molecule reactions, electron–ion and ion–ion recombination, atmospheric and astrophysical applications of atomic collisions.

Selected Publications

  1. Collisional-radiative recombination of Ar+ ions with electrons in ambient helium at temperatures for 50 K to 100 K. Dohnal, P.; Rubovič, Kotric, T., A. Hejduk, M.; Plašil, R. Johnsen, R.  Glosík, J. , Phys. Rev. A 87, 052716 (2013)
  2. Mutual neutralization of atomic rare-gas cations (Ne+, Ar+, Kr+, Xe+) with atomic halide anions (Cl-, Br-, I-) Nicholas S. Shuman, Thomas Miller, Rainer Johnsen,  Albert A. Viggiano, Journal of Chemical Physics 140, 044304 (2014)
  3. Three-body mechanisms in plasma recombination of H3+ and D3+ ions, Rainer Johnsen, EPJ Web of Conferences 84, 01003 (2015)
  4. Flowing-afterglow Measurements of Electron-Ion Recombination of para-H3+ and ortho-H3+ Ions at Temperatures from 60 to 300 K. Michal Hejduk, Petr Dohnal, Peter Rubovič, Ábel Kálosi, Radek Plašil, Juraj Glosík and Rainer Johnsen, Journal of Chemical Physics, 143, 044303 (2015)
  5. Rydberg state, metastable, and electron dynamics in the low-pressure argon afterglow Tsanko V. Tsankov, Rainer Johnsen  and Uwe Czarnetzki. Plasma Sources Sci. Technol. 24 (2015) 065001
  6. Transport coefficients of He+ ions in Helium, Larry A. Viehland, Rainer Johnsen, Benjamin R. Gray, and Timothy G. Wright, J. Chem. Phys. 144, 074306 (2016)
  7. Stationary afterglow measurements of the temperature dependence of electron-ion recombination rate coefficients of H2D+ and HD2+in He/Ar/H2/D2 gas mixtures at T = 80 -145 K, Radek Plasil, Petr Dohnal,Abel Kalosi, Stepan Roucka,Rainer Johnsen, and Juraj Glosik, Plasma Sources Sci. Technol. 26,035006 (2017)
  8. Accurate gaseous Ion mobility measurements, Larry A. Viehland, Anbara Lutfullaeva, Jamiyanaa Dashdorj, and Rainer Johnsen, Int. J. Ion Mobil. Spec.  20, 95( 2017)
  9. Overtone spectroscopy of N2H+ molecular ions —application of cavity ring-down spectroscopy, Á. Kálosi,  P. Dohnal, D. Shapko, S. Roucka, R. Plasil, R. Johnsen and J. Glosík JINST. 12 C10010 (2017)
  10. Stationary Afterglow apparatus with CRDS for study of processes in plasmas from 300 K down to 30 K, R. Plasil,P. Dohnal,  A. Kalosi, S. Roucka, D. Shapko, S. Rednyk, R. Johnsen, and J. Glosık, Review of Scientific Instruments 89, 063116 (2018)
  11. Velocity distribution functions for O+(4S3/2) ions drifting in helium and cross section for reaction of O+(4S3/2) with N2(v=0), Larry A. Viehland   and Rainer Johnsen, Journal of Chemical Physics, 149, 074311 (2018)
  12. Cross sections and rate coefficients for O+ Reacting with N2, O2, and NO, Larry A. Viehland and Rainer Johnsen, Journal of Geophysical Research Atmospheres 124, ( 2019), 13593-13600
  13. Dissociative recombination of N2H+ ions with electrons in the temperature range of 80–350 K. Dmytro Shapko, Petr Dohnal , Miroslava Kassayova, Abel Kalosi , Serhiy Rednyk,  Stepan Roucka, Radek Plasil , Lucie D. Augustovicova, Rainer Johnsen, Vladimír Spirko , and Juraj Glosík. J. Chem. Phys. 152, 024301 (2020)