6533b856fe1ef96bd12b24dc

RESEARCH PRODUCT

Double-resonance-ionization mapping of the hyperfine structure of the stable Cu isotopes using pulsed narrowband Ti:sapphire lasers

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We present two approaches to enhance the resolving power for measuring hyperfine structure constants using resonance ionization spectroscopy. The first method employs a 2D-resonance ionization spectroscopy scanning technique with pulsed, narrowband Ti:sapphire lasers (1 GHz linewidth), allowing us to resolve hyperfine components that cannot be separated using the standard 1D-scanning method across only one optical transition. In a second refinement, the resolving power is further enhanced through the use of a ring design of the laser cavity. This layout leads to a reduction of the laser linewidth from 1 GHz to below 50 MHz, resulting in experimental linewidths of about 150 MHz. Motivated by the current nuclear physics interest in radioactive Cu isotopes, the hyperfine structure of the $3{d}^{10}4s{\phantom{\rule{4pt}{0ex}}}^{2}{S}_{1/2}$ ground state and the $3{d}^{9}4s4p{\phantom{\rule{4pt}{0ex}}}^{4}{P}_{3/2}^{o}$ and $3{d}^{10}6s{\phantom{\rule{4pt}{0ex}}}^{2}{S}_{1/2}$ excited states in stable Cu isotopes were studied using both approaches. The hyperfine $A$ parameter of the $3{d}^{10}6s{\phantom{\rule{4pt}{0ex}}}^{2}{S}_{1/2}$ state was measured with values of $296(18)$ MHz for $^{63}\mathrm{Cu}$ and $307(18)$ MHz for $^{65}\mathrm{Cu}$.