physics.atom-ph
Comb-referenced Doppler-free spectrometry of the $^{200}$Hg and $^{202}$Hg intercombination line at 254 nm
Stefania Gravina Naveed A. Chishti Simona Di Bernardo Eugenio Fasci Antonio Castrillo Athanasios Laliotis Livio Gianfrani