Pressure-enhanced ortho-para conversion in solid hydrogen up to 58 GPa.
basic_science · Level V
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- Record sourced from PubMed, PMID 10535910.
- Also identified by PMC identifier 22905.
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Abstract
We measured the ortho-para conversion rate in solid hydrogen by using Raman scattering in a diamond-anvil cell, extending previous measurements by a factor of 60 in pressure. We confirm previous experiments that suggested a decrease in the conversion rate above about 0.5 GPa. We observe a distinct minimum at 3 GPa followed by a drastic increase in the conversion rate to our maximum pressure of 58 GPa. This pressure enhancement of conversion is not predicted by previous theoretical treatments and must be due to a new conversion pathway.