- Ch Vibrational Spectra 1 0 Tr Transmittahce Intensity Raman 8 0921 0 8 Oo 8 0923 Mode Freq Intensity Cm 1 Ir 646 7609 1 (38.62 KiB) Viewed 21 times
- Ch Vibrational Spectra 1 0 Tr Transmittahce Intensity Raman 8 0921 0 8 Oo 8 0923 Mode Freq Intensity Cm 1 Ir 646 7609 2 (39.51 KiB) Viewed 21 times
Group Theory - Lab 2 1. Does the number of normal modes in the vibrational spectra of your assigned polyatomic molecules (with Natoms) match you expectation? State the number of vibrational modes in both spectra and explain your expectation. 2. From the spectrum you have been provided, identify whether a. all the optically-active vibrations have been observed b. the molecules are linear or bent. 3. Identify whether your assigned polyatomic molecules have centres of inversion or not. Explain your reasoning. 4. Using group theoretical methods, assign the symmetries of the observed vibrational modes. State whether they are IR or Raman active. Note: For linear molecules you will have to use a slightly different method as the reduction formula cannot be used for ho 5. Distinguish between the stretching and bending modes in the spectra provided.