BeH+ molecules will be an important intermediary species present in fusion plasmas with Be walls (e.g. JET, ITER), both for impurity transport and spectroscopic studies. To enable such analyses the electron-impact-induced excitations X (1)Sigma(+)(v(i)) -> A (1)Sigma(+)(v(f)) and X (1)Sigma(+)(v(i)) -> B (1)Pi (v(f)) in BeH+(v(i)) molecular ion, occurring between the v(i) and v(f) vibrational levels of different electronic states (vibro-electronic transitions), have been studied using the Coulomb-Born approximation. The cross sections and rate coefficients for these transitions have been calculated in a broad energy and temperature range, respectively. Accurate analytic fit expressions have been derived for the cross sections and rate coefficients for the v(i) = v(f) = 0 case of considered electronic transitions that have correct asymptotic limits. It has been demonstrated that the cross sections and rate coefficients for v(i), v(f) > 0 transitions satisfy approximate (to within 10%) scaling relationships that involve the transition energies and matrix elements of dipole transition moments only.
|Autori interni:||CELIBERTO, Roberto|
|Titolo:||State-to-state electron impact cross sections for BeH+ molecular ions in ITER-like fusion edge plasmas with Be walls|
|Rivista:||PLASMA PHYSICS AND CONTROLLED FUSION|
|Data di pubblicazione:||2012|
|Digital Object Identifier (DOI):||10.1088/0741-3335/54/3/035012|
|Appare nelle tipologie:||1.1 Articolo in rivista|