Calculating the motion of individual atoms in the vibrational modes of molecules (called normal modes) is an advanced topic. Given the normal modes shown in the following figure, decide which of the normal modes of CO₂and H₂O have a nonzero dynamical dipole moment and are therefore infrared active. The motion of the atoms in the second of the two doubly degenerate bend modes for CO₂is identical to the first, but is perpendicular to the plane of the page. 

Transcribed Image Text:

нн н Н Н Symmetric stretch Asymmetric stretch Bend 0=c=0 0=C=0 -0=c=0+ 0=c=0 Symmetric stretch Asymmetric stretch Doubly degenerate bend