Recently, I have investigated vibration modes in NaGdF4 nanocrystal, and I came across of some bands in the resulting spectrum , somewhere at ~250, 300, and 360 cm-1. Somehow, I could not able to find any references to quantify and back the analysis. I would be grateful, if anyone insight me with your great knowledge related to this situation.

Thanks in advance and hope to hear from someone soon.