The proton nuclear transverse relaxation time T2 measurement of HD and ortho- H2 impurities in bulk para-H2 near the melting temperature.
Abstract
Measurements of the proton nuclear transverse relaxation time T2 for HD and ortho-H2 impurities in bulk para-H2 near the melting temperature will be reported. T2 is essentially temperature independent below 8 K, and passes through a minimum near 9.2 K. On warming, T2 increases exponentially on approaching the melting point [1], and a sharp decrease of T2 is observed at the melting temperature. For 13.96 K < T < 15.42 K, T2 is about 5 times larger than the value in the solid phase. This observation and comparison of the values for different ortho-H2 concentrations reported elsewhere [2] raises questions about the nature of liquid para-H2: should liquid para-H2 be considered as a quantum liquid, a semi-classical liquid or a typical classical liquid? The sample studied contained 1.1% HD, 2.1% ortho-H2 and 96.8% para-H2 . * Work supported by NSF Grant DMR-9623356 and NASA Contract NAG3 2750. # Ref.[1] D. Zhou, C. M. Edwards, and N. S. Sullivan, Phys. Rev. Lett. 62, 1528 (1989). [2] A. Abragam, Principles of Nuclear Magnetism, Clarendon Press, 1961.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2003
- Bibcode:
- 2003APS..MARX34009Z