Hydrogen crystals were pumped by stimulated Raman gain into coherent superpontlons of the ground and 2 u = 1 viimtional exciton state and Its amphtude monitored by coherent anti-Stokes scattering. The resufting non-exponential and temperature mdependent (1.6-4 2 K) decays, for o-H2 concentrations be
Heat capacities of solid ortho—para mixtures of deuterium in the ordered state
✍ Scribed by David White
- Publisher
- Elsevier Science
- Year
- 1976
- Tongue
- English
- Weight
- 526 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0301-0104
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Double quantum (DQ) filtering is shown to lead to an effective separation of the NMR signals from the para (I = 1) and ortho (I = 2) molecules in solid deuterium. The separation is achieved by the pulse sequence 90(φ)( degrees )-t(pr)-90(φ)( degrees )-t(ev)-90(x)( degrees )-t, where the phase-cycled
At very low temperatures, a mixture of gaseous para-and ortho-hydrogen, on account of the 9-fold degeneracy of the oH2 component, constitutes a 10-component mixture. The treatment of its transport properties by the Chapman-Enskog theory can be reduced to that of a binary mixture. In a 1 pH2 : 9 oH2