Chemistry in a Cryogenic Buffer Gas Cell
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912825655427072 |
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| author | Sun, Qi Dai, Jinyu Koots, Rian Riley, Benjamin C. Pérez-Ríos, Jesús Mitra, Debayan Zelevinsky, Tanya |
| author_facet | Sun, Qi Dai, Jinyu Koots, Rian Riley, Benjamin C. Pérez-Ríos, Jesús Mitra, Debayan Zelevinsky, Tanya |
| contents | Cryogenic buffer gas sources are ubiquitous for producing cold, collimated molecular beams for quantum science, chemistry, and precision measurements. The molecules are typically produced by laser ablating a metal target in the presence of a donor gas. The radical of interest emerges due to a barrier-free reaction or under thermal or optical excitation. High-barrier reactions, such as between Ca and H$_2$, should be precluded. We study chemical reactions between Ca and three hydrogen isotopologues H$_2$, D$_2$, and HD in a cryogenic cell with helium buffer gas. We observe that H$_2$ can serve as both a reactant and a buffer gas, outperforming D$_2$ and HD. We use a reaction network model to describe the chemical dynamics and find that the enhanced molecular yield can be attributed to rapid vibrational excitations of the reactant gas. Our results demonstrate a robust method for generating bright cold beams of alkaline-earth-metal hydrides for laser cooling and trapping. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_05613 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Chemistry in a Cryogenic Buffer Gas Cell Sun, Qi Dai, Jinyu Koots, Rian Riley, Benjamin C. Pérez-Ríos, Jesús Mitra, Debayan Zelevinsky, Tanya Atomic Physics Quantum Gases Chemical Physics Cryogenic buffer gas sources are ubiquitous for producing cold, collimated molecular beams for quantum science, chemistry, and precision measurements. The molecules are typically produced by laser ablating a metal target in the presence of a donor gas. The radical of interest emerges due to a barrier-free reaction or under thermal or optical excitation. High-barrier reactions, such as between Ca and H$_2$, should be precluded. We study chemical reactions between Ca and three hydrogen isotopologues H$_2$, D$_2$, and HD in a cryogenic cell with helium buffer gas. We observe that H$_2$ can serve as both a reactant and a buffer gas, outperforming D$_2$ and HD. We use a reaction network model to describe the chemical dynamics and find that the enhanced molecular yield can be attributed to rapid vibrational excitations of the reactant gas. Our results demonstrate a robust method for generating bright cold beams of alkaline-earth-metal hydrides for laser cooling and trapping. |
| title | Chemistry in a Cryogenic Buffer Gas Cell |
| topic | Atomic Physics Quantum Gases Chemical Physics |
| url | https://arxiv.org/abs/2501.05613 |