Two-step laser resonant ionization spectroscopy of chromium
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916702432788480 |
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| author | Schulz, Romina Li, Ruohong Wessolek, Julius Mostamand, Maryam Kunz, Peter Lassen, Jens |
| author_facet | Schulz, Romina Li, Ruohong Wessolek, Julius Mostamand, Maryam Kunz, Peter Lassen, Jens |
| contents | At TRIUMF's off-line laser ion source test stand, stepwise resonant laser ionization spectroscopy of chromium (Cr) was carried out, to find an efficient ionization scheme suitable for titanium sapphire (Ti:Sa) laser systems. With three different first-excitation transitions, 357.971 nm, 359.451 nm, and 360.636 nm, automated continuous laser-frequency scans using a frequency-doubled, grating-tuned Ti:Sa laser were performed. Rydberg series as well as autoionizing(AI) states were observed. From these results, the ionization potential (IP) of Cr was determined as 54575.49(2)$_\text{stat}$(2)$_\text{sys}$ cm$^{-1}$, which is one order of magnitude more precise than the previously reported 54575.6(3) cm$^{-1}$ in NIST database. The ionization scheme using the observed AI resonance, with 357.971 nm as the first step and 373.935 nm as the second step was subsequently deployed to the online delivery of radioactive Cr isotope beams for precision mass measurements. The online yields of $^{50-59}$Cr have been measured at TRIUMF-ISAC. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_16067 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Two-step laser resonant ionization spectroscopy of chromium Schulz, Romina Li, Ruohong Wessolek, Julius Mostamand, Maryam Kunz, Peter Lassen, Jens Atomic Physics Accelerator Physics Applied Physics At TRIUMF's off-line laser ion source test stand, stepwise resonant laser ionization spectroscopy of chromium (Cr) was carried out, to find an efficient ionization scheme suitable for titanium sapphire (Ti:Sa) laser systems. With three different first-excitation transitions, 357.971 nm, 359.451 nm, and 360.636 nm, automated continuous laser-frequency scans using a frequency-doubled, grating-tuned Ti:Sa laser were performed. Rydberg series as well as autoionizing(AI) states were observed. From these results, the ionization potential (IP) of Cr was determined as 54575.49(2)$_\text{stat}$(2)$_\text{sys}$ cm$^{-1}$, which is one order of magnitude more precise than the previously reported 54575.6(3) cm$^{-1}$ in NIST database. The ionization scheme using the observed AI resonance, with 357.971 nm as the first step and 373.935 nm as the second step was subsequently deployed to the online delivery of radioactive Cr isotope beams for precision mass measurements. The online yields of $^{50-59}$Cr have been measured at TRIUMF-ISAC. |
| title | Two-step laser resonant ionization spectroscopy of chromium |
| topic | Atomic Physics Accelerator Physics Applied Physics |
| url | https://arxiv.org/abs/2504.16067 |