Collinear laser spectroscopy (CLS) has been performed in a multi-reflection time-of-flight (MR-ToF) device operated in single-pass mode, i.e., without confining the ions in the ion trap. While our Multi Ion Reflection Apparatus for Collinear Laser Spectroscopy (MIRACLS) aims to increase the CLS sensitivity by storing ions in the MR-ToF device, the present work characterises conventional single-passage CLS as a preparatory step for the upcoming comparison with MIRACLS’ multi-pass mode. To this end, the isotope shift in the $3s{}^2{\text{S}}_{1/2}\to 3p{}^2{\text{P}}_{3/2}$ transition (D2 line) between ions of the magnesium isotopes ²⁴Mg and ²⁶Mg has been measured under varying experimental conditions. Our result agrees with the precise literature value. Associated studies of systematic uncertainties demonstrate a measurement accuracy of better than 20 MHz in this new apparatus. This value will serve as the reference for analogous studies to be performed in the MIRACLS approach in which ions are trapped in the MR-ToF device for thousands of revolutions and probed by the spectroscopy laser during each passage.

共线激光光谱 (CLS) 已在以单程模式运行的多反射飞行时间 (MR-ToF) 设备中执行，即不将离子限制在离子阱中。虽然我们用于共线激光光谱 (MIRACLS) 的多离子反射装置旨在通过在 MR-ToF 设备中存储离子来提高 CLS 灵敏度，但目前的工作将传统的单通道 CLS 表征为即将与 MIRACLS 的多离子反射仪进行比较的准备步骤。 -通过模式。为此，同位素转移$3秒{}^2{\text{秒}}_{1/2}\to 3磷{}^2{\text{磷}}_{3/2}$在不同的实验条件下测量了镁同位素²⁴ Mg 和²⁶ Mg离子之间的跃迁（D2 线）。我们的结果与精确的文献价值一致。对系统不确定性的相关研究表明，这种新设备的测量精度优于 20 MHz。该值将作为在 MIRACLS 方法中进行的类似研究的参考，其中离子被困在 MR-ToF 设备中数千转，并在每次通过期间由光谱激光探测。