  In this paper, we present and analyze measurements of the positron induced
electron spectra (PIES) from highly oriented pyrolytic graphite (HOPG). The
spectra were obtained using a time of flight spectrometer attached to a
variable energy positron beam. In the first measurements presented, the system
was configured to obtain high resolution data from the annihilation induced KVV
Auger transition of carbon. In the second set of data presented, PIES spectra
were obtained for 3 different positron beam energies (1.25 eV, 3.5 eV and 4.5
eV). The resulting time of flight (ToF)-PIES exhibit contributions arising from
either positron annihilation induced Auger processes (PAES), Auger mediated
positron sticking (AMPS), or secondary electron emission. Our analysis
indicates that for incident positron energies 3.5 eV and less, the ToF-PIES can
be accounted for considering only two mechanisms: positron annihilation induced
Auger processes or positron sticking.
