Two-step laser resonant ionization spectroscopy of neutral chromium
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Bibliographic record
Abstract
At TRIUMF’s off-line laser ion source test stand, stepwise resonant laser ionization spectroscopy of neutral chromium (Cr I) was carried out, to find an efficient ionization scheme suitable for titanium sapphire (Ti:Sa) laser systems. With the excitation to the three different intermediate levels, 27728.811 cm −1 , 27820.198 cm −1 , and 27935.241 cm −1 , 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 I was determined as 54575.49(2) stat (3) 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, λ 1 , v a c = 357.971 nm + λ 2 , v a c = 373.935 nm, 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. • The ionization potential of chromium is determined with increased precision. • An efficient two-step resonant laser ionization scheme via an autoionizing resonance has been developed. • Radioactive Cr isotope beam yields using the two-step resonant laser ionization scheme were measured.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it