  We have studied the electronic structure of
Ba(Fe$_{1-x}$Mn$_{x}$)$_{2}$As$_{2}$ ($x$=0.08), which fails to become a
superconductor in spite of the formal hole doping like
Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$, by photoemission spectroscopy and X-ray
absorption spectroscopy (XAS). With decreasing temperature, a transition from
the paramagnetic phase to the antiferromagnetic phase was clearly observed by
angle-resolved photoemission spectroscopy. XAS results indicated that the
substituted Mn atoms form a strongly hybridized ground state.
Resonance-photoemission spectra at the Mn $L_{3}$ edge revealed that the Mn 3d
partial density of states is distributed over a wide energy range of 2-13 eV
below the Fermi level ($E_F$), with little contribution around $E_F$. This
indicates that the dopant Mn 3$d$ states are localized in spite of the strong
Mn 3d-As $4p$ hybridization and split into the occupied and unoccupied parts
due to the on-site Coulomb and exchange interaction. The absence of
superconductivity in Ba(Fe$_{1-x}$Mn$_{x}$)$_{2}$As$_{2}$ can thus be ascribed
both to the absence of carrier doping in the FeAs plane, and to the strong
stabilizaiton of the antiferromagnetic order by the Mn impurities.
