OBSERVATION OF THE LAMBDA ANOMALY IN SOLID D2 BY NUCLEAR MAGNETIC RESONANCE.

Nuclear resonance studies were made of enriched para D2 samples with concentration of about 80 and the splitting of the resonance line in D2 below 2K was observed. A derivative of the resonance line at 4.2K was obtained with a sample containing 81 pD2. This line is actually a superposition of lines arising from molecules with I2 orthoD2 and I1 para D2. Since the molecules with I2 have J0 at these low temperatures, it is not expected that quenching of rotation will have any effect on their contribution to the resonance line, in a first approximation. Reduction of the temperature to about 2.2K revealed the existence of side peaks split apart by 76.8 0.5 kcsec. The calculated value of the splitting is in excellent agreement with the experimental value. After the splitting of the line occurred, several other effects were observed i the signal to noise ratio deteriorated rather badly, ii the line became so asymmetric that the recorder trace bore little resemblance to the conventional derivative curve, and iii the remnant central line became noticeably broader, with a width of 5-8 gauss.