  The superconducting critical temperature $T_{\mathrm{c}}$ of intercalated
iron-selenide superconductor (Li,Fe)OHFeSe (FeSe11111) can be increased to 42 K
from 8 K of bulk FeSe. It shows remarkably similar electronic properties as the
high-$T_{\mathrm{c}}$ monolayer FeSe and provides a bulk counterpart to
investigate the origin of enhanced superconductivity. Unraveling the nature of
excitations is crucial for understanding the pairing mechanism in
high-$T_{\mathrm{c}}$ iron selenides. Here we use resonant inelastic x-ray
scattering (RIXS) to investigate the excitations in FeSe11111. Our high-quality
data exhibit several Raman-like excitations, which are dispersionless and
isotropic in momentum transfer and robust against varying $T_{\mathrm{c}}$.
Using atomic multiplet calculations, we assign the low-energy $\sim 0.3$ and
0.7 eV Raman peaks as local $e_g-e_g$ and $e_g-t_{2g}$ orbital excitations. The
intensity of these two features decreases with increasing temperature,
suggesting a primary contribution of the orbital fluctuations. Our results
highlight the importance of orbital degree of freedom for high-$T_{\mathrm{c}}$
iron selenides.
