Author Institution: Department of Physics, The University of TorontoThe infrared fundamental band of solid normal hydrogen has been investigated over the temperature range 1.3 to 1.7βK. Two features in the spectrum, the S1β(0) line and the S1β(1) line, vanish at a temperature of about 1.4βK when the crystal is cooled. The features reappear at about 1.6βK when the crystal is warmed. The temperature at which the transition takes place upon warming is close to the Ξ»-a***omaly in the specific heat. The vanishing of the two spectral features can be explained if one assumes a phase transition to a crystal structure possessing inversion symmetry