Measurement and Calculation of Absolute Single and Double Charge Exchange Cross Sections for O6+ Ions at 1.17 keV/u and 2.33 keV/u Impacting He and H2

Published

November 10, 2014

Author(s)

J. R. Machacek, D. P. Mahapatra, D. R. Schultz, Yuri Ralchenko, A. Chutjian, J. Simcic, S. M. Madzunkov, R. J. Mawhorter

Abstract

Absolute single and double charge-exchange (CE) cross sections for the astrophysically-prominent O6+ ion with the atomic and molecular targets He and H2 are reported. These collisions give rise to X-ray emissions in the interplanetary medium, planetary atmospheres, and in comets as they approach the Sun. Measurements have been carried out using the JPL electron cyclotron resonance ion source with O6+ at energies of 1.17 keV/u and 2.33 keV/u characteristic of the slow and fast components of the solar wind. Absolute CE data are derived from knowledge of the target gas pressure, target path length, incident ion current, and charge-exchanged ion currents. These data are compared with results obtained using the n-electron classical trajectory Monte Carlo method. The radiative and Auger evolution of ion populations following one- and two-electron transfers is calculated with the time-dependent collisional-radiative code NOMAD using atomic data from the Flexible Atomic Code. Predicted CE emission spectra for 100 Å < λ < 1400 Å are reported as well.

Citation

Physical Review A

Pub Type

Journals

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Keywords

single and double charge-exchange cross sections, oxygen, Classical Trajectory Monte Carlo, collisional-radiative modeling

Citation

Machacek, J. , Mahapatra, D. , Schultz, D. , Ralchenko, Y. , Chutjian, A. , Simcic, J. , Madzunkov, S. and Mawhorter, R. (2014), Measurement and Calculation of Absolute Single and Double Charge Exchange Cross Sections for O6+ Ions at 1.17 keV/u and 2.33 keV/u Impacting He and H2, Physical Review A, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=916032 (Accessed December 4, 2024)