Doping He droplets by laser ablation with a pulsed supersonic jet source

Area of Science:

• Atomic and Molecular Physics
• Spectroscopy
• Nanoscale Science

Background:

• Laser ablation is a technique for generating atomic and molecular species in the gas phase.
• Helium nanodroplets provide a cold, weakly perturbed environment for studying isolated species.
• Existing doping methods for helium nanodroplets have limitations.

Purpose of the Study:

• To present a novel setup for doping pulsed helium nanodroplet beams using laser ablation.
• To investigate the influence of experimental parameters on doping efficiency.
• To compare laser ablation doping with conventional oven cell doping.

Main Methods:

• Development and implementation of a new laser ablation doping setup for pulsed helium nanodroplet beams.
• Characterization of doping processes using a surface ionization detector.
• Spectroscopic analysis of ablated materials via laser-induced fluorescence.

Main Results:

• Demonstrated efficient doping of helium nanodroplets using pulsed laser ablation.
• Identified key experimental parameters affecting doping efficiency, such as plume overlap with droplet formation.
• Observed comparable doping efficiency to conventional oven cell methods under similar helium stagnation conditions.

Conclusions:

• The new laser ablation setup is effective for doping helium nanodroplets.
• Optimizing the overlap between the ablation plume and droplet formation enhances doping.
• This technique provides a viable alternative for preparing cold, isolated species for spectroscopic studies.