Abstract
The paper show an application of collinear laser spectroscopy by studying the field-shifts of two optical dipole transitions in Ca${}^{+}$.
Highlights
Accurate isotope shift and transition frequency measurements are required for a wide variety of applications
The information from the isotope shift has been used for almost a century to extract nuclear sizes, namely, changes in the mean-square nuclear charge radius
The isotope shift can be split into the mass shift and the field shift, which originate from the change in the kinetic energy of the center-of-mass motion and the change in the nuclear charge distribution, respectively
Summary
Accurate isotope shift and transition frequency measurements are required for a wide variety of applications. Isotope shifts are of interest to study a possible variation in the fine-structure constant in strong gravitational fields of quasars [2,3]. Laser spectroscopic techniques such as resonance ionization mass spectrometry are applied to study extremely rare long-lived radioisotopes, where the isotope shift is used to suppress strongly dominant more abundant neighboring isotopes for radiodating of materials or as a tracer for biomedical applications [4]. In the more classical application at the borderline of atomic and nuclear
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