High-resolution saturation spectroscopy of singly-ionized iron with a pulsed UV laser

Abstract

Abstract. We describe the design and realization of a scheme for uv laser spectroscopy of singly-ionized iron (Fe II) with very high resolution. A buffer-gas cooled laser ablation source is used to provide a plasma close to room temperature with a high density of Fe II. We combine this with a scheme for pulsed-laser saturation spectroscopy to yield sub-Doppler resolution. In a demonstration experiment, we have examined an Fe II transition near 260 nm, attaining a linewidth of about 250 MHz. The method is well-suited to measuring transition frequencies and hyperfine structure. It could also be used to measure small isotope shifts in isotope-enriched samples. ‡ Present address:

Laser Ablation Saturated Absorption Spectroscopy (LA-SAS) for In Situ Detection of Neodymium Isotopes

“…In addition, the versatility of SAS can be further improved by integrating laser ablation. 35 Despite these advancements, the application of LA-based SAS for isotopic analysis remains underexplored and warrants further investigation.…”

“…This configuration allows for the selective interaction with atoms moving perpendicular to the laser beams, yielding Doppler-free signals (i.e., Lamb dip). In addition, the versatility of SAS can be further improved by integrating laser ablation . Despite these advancements, the application of LA-based SAS for isotopic analysis remains underexplored and warrants further investigation.…”