Question

Raman scattering from the CO2 molecule occurs on the symmetric stretch mode (see Fig. 23-22), which vibrates at 40 THz. If the usual isotope of oxygen (8 protons, 8 neutrons) is replaced by one with 8 protons and 10 neutrons (18O), the mass that governs the vibrational frequency in Eq. (5-8) will be increased by the factor 18/16. (a) Determine the molecular vibrational frequency for CO2 with the 18O isotope. (b) If the incident light has wavelength 800 nm, calculate the wavelength of Raman-scattered light for both the 16O and 18O isotopes.

Answer 1