TY  - JOUR
AU  - Turnšek, J.
AU  - Krušič, Š.
AU  - Mihelič, A.
AU  - Bučar, K.
AU  - Foglia, L.
AU  - Mincigrucci, R.
AU  - Krstulović, M.
AU  - Coreno, M.
AU  - Bonano, G.
AU  - Prince, K. C.
AU  - Callegari, C.
AU  - Simoncig, A.
AU  - Ebrahimpour, Z.
AU  - Paltanin, E.
AU  - Benediktovitch, A.
AU  - Osellame, R.
AU  - Ciriolo, A. G.
AU  - Martínez Vázquez, R.
AU  - Vozzi, C.
AU  - Principi, E.
AU  - Žitnik, M.
TI  - Amplification of Spontaneous Emission from Doubly Excited He Atoms
JO  - Physical review letters
VL  - 135
IS  - 9
SN  - 0031-9007
CY  - College Park, Md.
PB  - APS
M1  - PUBDB-2025-05405
SP  - 093001
PY  - 2025
N1  - cc-by
AB  - We have observed amplification of weak fluorescence from He atoms in the 3a  1 𝑃𝑜   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
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1103/mg5s-xvct
UR  - https://bib-pubdb1.desy.de/record/642209
ER  -