  We report a comprehensive temperature dependent Raman measurements on three
different phases of monolayer WS2 from 4K to 330K in a wide spectral range. Our
studies revels the anomalous nature of the first as well as the higher order
combination modes reflected in the disappearance of the few modes and anomalous
temperature evaluation of the phonon self-energy parameters attributed to the
detuning of resonance condition and development of strain due to thermal
expansion mismatch with the underlying substrate. Our detailed temperature
dependence studies also decipher the ambiguity about assignment of the two
modes in literature near ~ 297 cm-1 and 325 cm-1. Mode near 297 cm-1 is
assigned as first order Raman mode, which is forbidden in the backscattering
geometry and 325 cm-1 is assigned to the combination of and mode. We also
estimated thermal expansion coefficient by systematically disentangling the
substrate effect in the temperature range of 4K to 330K and probed its
temperature dependence in 1H, 1T and 1T' phases.
