Figure 1. Schematic of experimental setup and muon stopping and light absorption profiles in germanium.

Muon stopping profiles at the indicated implantation energies were calculated with the Monte-Carlo code TrimSP²⁹,³⁰ from 1 keV to 20 keV. A light absorption coefficient α ~ 5 · 10⁵/cm has been assumed for the used blue light sources with peak wavelengths of 470 nm and 405 nm³¹, corresponding to photon energies of 2.6 and 3.0 eV, respectively. The pressure at the sample was ≤10⁻⁸ mbar.