(a) The figure below is the Raman spectrum of a mixture of isotopes of molecular oxygen: 1602 and 1802. 2061 cm 1764 cm Intensity (arbitrary units) 3528 cm 1000 DO DO 03 OK T Raman Shift (cm) (i) Identify the origin of each of these three peaks, clearly explaining your reasoning. [6 marks] (ii) If a 785 nm laser was used, calculate the wavelength (in nm) of the light scattered by each Raman mode, [6 marks] Question 2 continued overleaf