Electron capture processes in collisions of O6+ with He using the travelling molecular orbital method

Partial and total cross sections of single electron capture processes from He by O6+ are calculated for the velocity range from 0.075 to 0.53 au. A molecular orbital expansion method including electron translation factors has been employed along with classical trajectories. The adiabatic potential energies and wavefunctions for the (O + He)6+ system were generated using a pseudopotential technique. The cross sections were calculated using seven- and eight-channel close-coupling treatments. Calculated total cross sections are relatively independent of velocity, with a value of about 10-15 cm2. However, partial cross sections are more sensitive to velocity in the lower velocity region. These findings agree well with experimental observations and results calculated with an atomic orbital expansion method. (author)