Bonn 2025 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 35: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)

A 35.13: Poster

Donnerstag, 13. März 2025, 17:00–19:00, Tent

Construction and characterization of an atomic gas jet — •anant agarwal, lennart guth, jan-hendrik oelmann, tobias heldt, lukas matt, josé r. crespo lópez-urrutia, and thomas pfeifer — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Spectroscopy of the narrow band transitions of highly charged ions (HCI) which lie in the extreme-ultraviolet (XUV) regime offers opportunities for next generation atomic clocks and precision studies of fundamental constants. To enable these studies, we developed an XUV frequency comb using cavity-enhanced high-harmonic generation, driven by a 100 MHz near-infrared frequency comb [1]. We plan to perform two-photon spectroscopy of neutral argon atoms prior to probing the HCI transitions with our XUV frequency comb in order to characterize the properties of the comb. Our two-photon spectroscopy scheme uses one comb tooth of the 13th harmonic to excite a Rydberg state and a CW NIR laser to further ionize the argon. The freed electrons are subsequently measured using a velocity-map imaging setup. We will discuss the construction and characterization of an atomic gas jet, which plays a crucial role in the setup by enabling Doppler-free delivery of argon atoms, and present first results towards the argon excitation.

[1] Opt. Express 29, 2624-2636 (2021)

Keywords: High-harmonic generation; Frequency comb spectroscopy; Atomic gas jet; Femtosecond