  We present a Raman study of ZrAs_{2} single crystals, a nodal line semimetal
with symmetry-enforced Dirac-like band crossings. We identified the symmetry of
phonon modes by polarized light measurements and comparison with calculated
phonon frequencies. Significant dependence of peak intensities on the
excitation wavelength was observed, indicating quantum interference effects.
Phonon peaks in the spectra are superimposed on the electronic background, with
quasi-elastic scattering observed for the 785 nm excitation. We identified the
Fano shape of the 171 cm^{-1} Ag mode due to interference of the phonon state
with the electronic continuum. The temperature dependence of phonon peaks
linewidth indicates that the electron-phonon coupling plays an essential role
in phonon decay.
