Selective ionization of Rydberg atoms to reduce the energy spread of a cold atom focused ion beam
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arXiv
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| Hauptverfasser: | , , , , , , |
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| Format: | Preprint |
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2025
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| author | Mitchell, Kaih T. Pennings, Allan Speirs, Rory W. Billington, Christopher J. McCulloch, Andrew J. Wood, Alexander A. Scholten, Robert E. |
| author_facet | Mitchell, Kaih T. Pennings, Allan Speirs, Rory W. Billington, Christopher J. McCulloch, Andrew J. Wood, Alexander A. Scholten, Robert E. |
| contents | The energy spread of a focused ion beam causes chromatic aberration that limits the focal spot size and resolution for imaging and fabrication. Ion beams based on photoionization of neutral atoms can have a much smaller energy spread and higher brightness than conventional liquid metal ion sources and are thus capable of higher resolution. We present a method for using selective ionization of Rydberg atoms to reduce the beam energy spread in a cold atom focused ion beam. We produce experimental maps of the ionization rate of Rubidium-85 near the classical ionization threshold, predict the energy spread of an ion beam produced from these states and demonstrate energy spread reduction in situ in a focused ion beam. We use a novel method to measure the energy spread, using only components present in many commercial FIB systems. Selecting different states changed the energy spread by up to 50%, with opportunities to further reduce the energy spread by constructing a more favorable electric field gradient and finding atomic states with better ionization characteristics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_05750 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Selective ionization of Rydberg atoms to reduce the energy spread of a cold atom focused ion beam Mitchell, Kaih T. Pennings, Allan Speirs, Rory W. Billington, Christopher J. McCulloch, Andrew J. Wood, Alexander A. Scholten, Robert E. Atomic Physics The energy spread of a focused ion beam causes chromatic aberration that limits the focal spot size and resolution for imaging and fabrication. Ion beams based on photoionization of neutral atoms can have a much smaller energy spread and higher brightness than conventional liquid metal ion sources and are thus capable of higher resolution. We present a method for using selective ionization of Rydberg atoms to reduce the beam energy spread in a cold atom focused ion beam. We produce experimental maps of the ionization rate of Rubidium-85 near the classical ionization threshold, predict the energy spread of an ion beam produced from these states and demonstrate energy spread reduction in situ in a focused ion beam. We use a novel method to measure the energy spread, using only components present in many commercial FIB systems. Selecting different states changed the energy spread by up to 50%, with opportunities to further reduce the energy spread by constructing a more favorable electric field gradient and finding atomic states with better ionization characteristics. |
| title | Selective ionization of Rydberg atoms to reduce the energy spread of a cold atom focused ion beam |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2505.05750 |