Electron-impact ionization of the metastable excited states of Li

• Published in: Journal of physics. B, Atomic, molecular, and optical physics Vol. 40; no. 7; pp. 1331 - 1336
• Main Authors: Berengut, J C, Loch, S D, Ballance, C P, Pindzola, M S
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 14.04.2007; Institute of Physics
• Subjects: Atomic and molecular collision processes and interactions; Atomic and molecular physics; Electron scattering; Electron-ion scattering; excitation and ionization; Exact sciences and technology; Physics; Isoelectronic series; Electron impact ionization; Electron-ion collisions; Metastable states; Lithium Atomic ions; Theoretical study; Distorted wave approximation; Excited states; Positive ions; Close coupling approximation; He-like ions; R matrix; Cross sections
• ISSN: 0953-4075; 1361-6455
• DOI: 10.1088/0953-4075/40/7/002

Electron-impact ionization cross sections for the 1s2s1S and 1s2s3S metastable states of Li+ are calculated using both perturbative distorted-wave and non-perturbative R-matrix with pseudo-states and time-dependent close-coupling methods. Term-resolved distorted-wave calculations are found to be approximately 15% above term-resolved R-matrix with pseudostates calculations. On the other hand, configuration-average time-dependent close-coupling calculations are found to be in excellent agreement with the configuration-average R-matrix with pseudostates calculations. The non-perturbative R-matrix and close-coupling calculations provide a benchmark for experimental studies of electron-impact ionization of metastable states along the He isoelectronic sequence.