Large-angle xenon ion scattering in Xe-propelled electrostatic thrusters: differential cross sections

• Published in: Journal of physics. D, Applied physics Vol. 41; no. 16; pp. 165503 - 165503 (10)
• Main Authors: Chiu, Y-H, Dressler, R A, Levandier, D J, Houchins, C, Ng, C Y
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 21.08.2008; Institute of Physics
• Subjects: Ab initio calculations; Atomic and molecular collision processes and interactions; Atomic and molecular physics; Calculations and mathematical techniques in atomic and molecular physics (excluding electron correlation calculations); Electronic structure of atoms, molecules and their ions: theory; Exact sciences and technology; Physics; Scattering of atoms, molecules and ions; Ab initio method; Differential cross sections; Elastic scattering; Xenon; Theoretical study; Atom ion collision; Ionic current; Experimental study; Boron Nitrides; Molybdenum; Sputtering; Ion beams; eV range; Doubly charged ion; Interaction potentials; Ab initio calculations; Xenon Atomic ions; Kinetic energy; Erosion
• ISSN: 0022-3727; 1361-6463
• DOI: 10.1088/0022-3727/41/16/165503

Elastic scattering between xenon ions and xenon atoms can produce ion currents at large angles with respect to the axis of electrostatic thrusters. Differential scattering cross sections are needed to properly predict off-axis currents that can cause significant material erosion due to sputtering. Guided-ion beam differential cross section measurements are presented for Xe+ + Xe and Xe2+ + Xe elastic scattering at laboratory ion energies between 5 and 40 eV per ion charge. For the singly charged system, the experimental absolute differential cross sections are in excellent agreement with classical elastic scattering calculations based on the most recent ab initio ion-atom interaction potentials. The measurements for the doubly charged system are used to derive an approximate effective Xe2+-Xe interaction potential. The potentials are used to calculate absolute differential cross sections for both ion charge states at a typical Hall thruster ion energy of 270 eV per unit charge. The differential cross sections for the doubly charged ions are approximately a factor of 3 smaller than those of the singly charged system at large scattering angles. The importance of doubly charged ions with respect to material erosion is discussed on the basis of known sputtering yields as a function of ion energy for molybdenum and boron nitride. It is concluded that at typical charge-state ratios, doubly charged ions only have an impact at elastic scattering angles where the scattered ion energy in the laboratory (thruster) frame of reference is low and the sputtering yields depend very strongly on ion kinetic energy.