You can get a rough estimate by assuming the vibrations are simple harmonic.The velocity varies between zero and a maximum of 2pi*frequency*amplitude of vibration.(as matterwave pointed out it was probably the frequency that you found)
Thermal neutrons (mass = 1 AMU) have an rms velocity of about 2200 meters per second at room temperature. Heavier molecules like N2 have an rms velocity of 2200/sqrt (28)where 28 is the gram molecular mass of nitrogen molecule. The relation is (1/2) m v2 = kT where k is Boltzmann's constant and T is in kelvin.
Boltzmanns constant = 1.38 x 10-23 Joules per degree kelvin