Year: 2025
Type: article
Abstract: We have observed amplification of weak fluorescence from He atoms in the 3a ^{1}P^{o} autoionizing state, which decay by spontaneous emission of 40.74 eV photons in one out of 1600 cases. On average, a 4.1±1.6% conversion of 63.67 eV photons was detected in the forward direction at 20 μJ pump pulse energy and 40 mbar He gas pressure. A comparison with state-of-the-art theoretical simulations shows an unexpected spectral line shift at high gas pressure that is ascribed to transient molecular and electron scattering effects.
Source: Physical Review Letters
DOI: 10.1103/mg5s-xvct
Language: English
Topic: Atomic and Molecular Physics
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,750
OpenAlex ID: W4413678135