  We performed a combined angle-resolved photoemission spectroscopy and
scanning tunneling microscopy study of the electronic structure of
electron-doped Ca$_{0.83}$La$_{0.17}$Fe$_2$As$_2$. A surface reconstruction
associated with the dimerization of As atoms is observed directly in the real
space, as well as the consequent band folding in the momentum space. Besides
this band folding effect, the Fermi surface topology of this material is
similar to that reported previously for BaFe$_{1.85}$Co$_{0.15}$As$_2$, with
$\Gamma$-centred hole pockets quasi-nested to M-centred electron pockets by the
antiferromagnetic wave vector. Although no superconducting gap is observed by
ARPES possibly due to low superconducting volume fraction, a gap-like density
of states depression of $7.7\pm 2.9$ meV is determined by scanning tunneling
microscopy.
