Measurement of the total spin angular momentum <Fz> of alkali-metal atoms
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866913810442354688 |
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| author | Yasuda, Runa Ishii, Kei Klassen, Wolfgang Martin, Jeffery W. Hatakeyama, Atsushi |
| author_facet | Yasuda, Runa Ishii, Kei Klassen, Wolfgang Martin, Jeffery W. Hatakeyama, Atsushi |
| contents | It is important to evaluate the total spin angular momentum of alkali-metal atoms if the atoms serve as a reservoir of angular momenta. We use an absorption-monitoring technique to measure <Fz>, i.e., the expectation values of the quantization (z) axis components of the total angular momentum of cesium (Cs) atoms in the electronic ground state in both uncoated and anti-relaxation-coated vacuum cells at room temperature. Cs atoms are polarized via optical pumping and probed using their D2 transitions. The probe laser frequency is varied across the Doppler-broadened D2 transition; the <Fz> values are derived using the integrated absorption coefficients. The largest <Fz> is 2.5 for the coated cell. We then use a simple model of spin flow through vapor cells to estimate the atomic spin relaxation probabilities after a single surface collision. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_19713 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Measurement of the total spin angular momentum <Fz> of alkali-metal atoms Yasuda, Runa Ishii, Kei Klassen, Wolfgang Martin, Jeffery W. Hatakeyama, Atsushi Atomic Physics It is important to evaluate the total spin angular momentum of alkali-metal atoms if the atoms serve as a reservoir of angular momenta. We use an absorption-monitoring technique to measure <Fz>, i.e., the expectation values of the quantization (z) axis components of the total angular momentum of cesium (Cs) atoms in the electronic ground state in both uncoated and anti-relaxation-coated vacuum cells at room temperature. Cs atoms are polarized via optical pumping and probed using their D2 transitions. The probe laser frequency is varied across the Doppler-broadened D2 transition; the <Fz> values are derived using the integrated absorption coefficients. The largest <Fz> is 2.5 for the coated cell. We then use a simple model of spin flow through vapor cells to estimate the atomic spin relaxation probabilities after a single surface collision. |
| title | Measurement of the total spin angular momentum <Fz> of alkali-metal atoms |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2504.19713 |