Molecule bonds can have different vibration types {vibration, molecule}.
types
Vibrations can stretch and compress chemical bonds along line between nuclei. Vibrations can widen and narrow angle between two bonds.
number
Molecules with no bonds cannot vibrate.
Molecules with one bond have one vibration type, bond compressing and stretching.
Molecules with two bonds can have four vibration modes. One bond can stretch, as the other compresses. Both bonds can stretch and compress at same time. Angle between bonds can narrow and widen. One bond can move downward perpendicular to bond plane, while one moves upward perpendicular to bond plane.
symmetry
Molecule symmetries can make two vibration modes indistinguishable and decrease total number of vibration modes.
Physical Sciences>Chemistry>Inorganic>Chemical>Molecule>Energy
5-Chemistry-Inorganic-Chemical-Molecule-Energy
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Date Modified: 2022.0224