High-purity solid parahydrogen
| Autor: | Bhandari, Ashok, Rollings, Alexandar P., Ratto, Levi, Weinstein, Jonathan D. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Review of Scientific Instruments 92, 073202 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/5.0049006 |
| Popis: | Alkali atoms trapped in solid hydrogen matrices have demonstrated ultralong electron spin coherence times, and are promising as quantum sensors. Their spin coherence is limited by magnetic noise from naturally-occurring orthohydrogen molecules in the parahydrogen matrix. In the gas phase, the orthohydrogen component of hydrogen can be converted to parahydrogen by flowing it over a catalyst held at cryogenic temperatures, with lower temperatures giving a lower orthohydrogen fraction. In this work, we use a single cryostat to reduce the orthohydrogen fraction of hydrogen gas and grow a solid matrix from the resulting high-purity parahydrogen. We demonstrate operation of the catalyst down to a temperature of 8 K, and we spectroscopically verify that orthohydrogen impurities in the resulting solid are at a level < 1e-6. We also find that, at sufficiently low temperatures, the cryogenic catalyst provides isotopic purification, reducing the HD fraction. Comment: 7 pages, 8 figures |
| Databáze: | arXiv |
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