Use of the FT Raman spectrum of Na2MoO4 to study sample heating by the laser

The difference in the FT Raman spectrum of sodium molybdate when it undergoes a crystal transition at about 112°C is used to qualitatively study laser heating effects. Relatively lower laser powers (125 mW) are able to raise the sample temperature by 40°C. Furthermore, large temperature gradients across the sample have been observed.