Precision spectroscopy and frequency determination of the hyperfine components of the P(63) 4-4 transition of molecular iodine near 652 nm

Year: 2024

Authors: Manzoor S., Chiarotti M., Meek S.A., Santambrogio G., Poli N.

Autors Affiliation: Univ Firenze, Dipartimento Fis & Astron, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy; LENS, Lab Europeo Spettroscopia Nonlineare, Via N Carrara 1, I-50019 Sesto Fiorentino, Italy; Univ Oklahoma, Ctr Quantum Res & Technol, Homer L Dodge Dept Phys & Astron, 440 W Brooks St, Norman, OK 73019 USA; CNR INO, Ist Nazl Ott, Via N Carrara 1, I-50019 Sesto Fiorentino, Italy; INRIM, Ist Nazl Ric Metrol, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy.

Abstract: We report the observation of the hyperfine spectrum of the weak P(63) 4-4 line of the B – X electronic transition of molecular iodine 127 I 2 near 652.4 nm, using frequency-modulated saturated absorption spectroscopy. Through the precise measurements of the absolute frequencies of hyperfine components, we estimate electric quadrupole and magnetic spin-rotation constants. Additionally, we determine the center of gravity of the P(63) transition of the 4-4 vibrational band, resulting in a 250-fold improvement in the precision of its position. We also note an interesting overlap of the hyperfine transitions of the P(63)4-4 line with the UV 1 S 0 – 3 P 1 narrow intercombination transition of cadmium atoms, which occurs near the second harmonic of the master laser radiation, corresponding to 326.2 nm. This study contributes to updating the iodine atlas, improving the precision of the empirical formulae, and providing an important frequency reference for precision spectroscopy of the narrow intercombination transition of atomic cadmium. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Journal/Review: OPTICS EXPRESS

Volume: 32 (25)      Pages from: 44683  to: 44693

More Information: Ministero dell’Universita e della Ricerca (PRIN 2022-2022Z8LX9L-ISOTOP) ; European Research Council (772126-TICTOCGRAV) .
KeyWords: Absolute Frequency; Diatomic-molecules; I-2 Spectrum; I-127(2); Laser; State; Stabilization; Splittings; Lines
DOI: 10.1364/OE.539192