Problem 6.181

Consider the possible vibration modes in the following linear molecules: \(\begin{array}{lll}\text { (a) } \mathrm{CO}_ {2} & (\mathrm{O}-\mathrm{C}-\mathrm{O})\end{array}\) \(\begin{array}{llll}\text { (b) } & \mathrm{C}_ {2} \mathrm{H}_ {2} & (\mathrm{H}-\mathrm{C}-\mathrm{C}-\mathrm{H})\end{array}\)