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We have carried absolute frequency measurements of the (6 ) -(66) transition in (intercombination line), where the spin-1/2 isotope yields two hyperfine lines. The measurements rely on sub-Doppler spectroscopy to yield a discriminator to which a 556 nm laser is locked. The frequency reference for the optical frequency measurements is a high-quality quartz oscillator steered to the GNSS time scale that is bridged with a frequency comb.
View Article and Find Full Text PDFWe used precision spectroscopy to analyze the R(53)24-1, P(49)24-1, and R(95)25-1 lines of molecular iodine (I) to establish optical frequency references for the laser cooling of Yb atoms using the S - P intercombination transition at 556 nm. A laser frequency instability of < 2 × 10 (for 0.01 s < τ < 3000 s, τ is the average time of the measurement) was attained using the observed Doppler-free hyperfine transitions of the iodine lines.
View Article and Find Full Text PDFThe resonance 3C ([(2p)3d] → [2p]) to intercombination 3D ([(2p)3d] → [2p]) line intensity ratio of neonlike ions has been studied. The measured line intensity ratio for neonlike Xe ions shows an apparent change, which is reproduced by the calculations using the relativistic configuration interaction plus many-body perturbation theory. It is clearly elucidated that the change in the 3C/3D line intensity ratio is caused by strong configuration mixing between the upper levels of the 3D and 3F ([(2p)3s] → [2p]) lines.
View Article and Find Full Text PDFParticle transport constraints via Bayesian spectral fitting of multiple atomic lines.
Rev Sci Instrum
May 2021
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Optimized operation of fusion devices demands detailed understanding of plasma transport, a problem that must be addressed with advances in both measurement and data analysis techniques. In this work, we adopt Bayesian inference methods to determine experimental particle transport, leveraging opportunities from high-resolution He-like ion spectra in a tokamak plasma. The Bayesian spectral fitting code is used to analyze resonance (w), forbidden (z), intercombination (x, y), and satellite (k, j) lines of He-like Ca following laser blow-off injections on Alcator C-Mod.
View Article and Find Full Text PDFExperimental realization of a Rydberg optical Feshbach resonance in a quantum many-body system.
Nat Commun
June 2018
Department of Physics and Research Center OPTIMAS, Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße 46, 67663, Kaiserslautern, Germany.
Feshbach resonances are a powerful tool to tune the interaction in an ultracold atomic gas. The commonly used magnetic Feshbach resonances are specific for each species and are restricted with respect to their temporal and spatial modulation. Optical Feshbach resonances are an alternative which can overcome this limitation.
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