  We present the results of resonant photoemission spectroscopy experiments on
the Mo$_{1-x}$Re$_{x}$ alloy compositions spanning over two electronic
topological transitions (ETT) at the critical concentrations $x_{C1}$ = 0.05
and $x_{C2}$ = 0.11. The photoelectrons show an additional resonance ($R3$) in
the constant initial state (CIS) spectra of the alloys along with two
resonances ($R1$ and $R2$) which are similar to those observed in molybdenum.
All the resonances show Fano-like line shapes. The asymmetry parameter $q$ of
the resonances $R1$ and $R3$ of the alloys is observed to be large and
negative. Our analysis suggests that the origin of large negative q is
associated with phonon assisted inter band scattering between the Mo-like
states and the narrow band that appeared due to the ETT.
