In the present experiments, the electron energy distributions contributing to the L
3, 2 Auger electron appearance potential (AEAP) and disappearance potential (DAP) spectra were studied. The specimens were evaporated Ti films, which were exposed up to 150 Langmuir O
2, In the case of the virgin surface before the exposuer, the energy value of the L
3 dip of AEAP spectrum did not change when the low energy true secondary electrons were removed using retarding potential method. However, after the O
2 exposure, shifts of 0.4_??_0.6 eV were observed. The intensity of the L
3, 2 DAP spectrum involving inelastically scattered electrons increases more than that of the pure DAP spectrum. The L
3 dip of DAP spectrum shifts to the higher energy side after the O
2 exposure. The probing depth of AEAP spectroscopy is larger than DAP spectroscopy.
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