Angular dependence of the electronic energy loss for low energy heavy ions under channeling conditions

The electronic stopping of heavy ions with 2 ≤ Z 1 ≤ 36 in 〈110〉 direction of a 350 nm thick silicon single crystal was measured for velocities below Bohr velocity. Large oscillations in the electronic stopping power are observed for best-channeled ions of the same velocity, whereas for ions emerging from the foil some degrees to the channel axis the oscillations are strongly reduced.