The magnetic dipole moment and mean-square charge radius of Pt199g (Iπ= 5/2-,t1/2=30.8 min) ground state and Pt199m (Eex=424 keV, Iπ= (13/2)+,t1/2=13.6 s) isomeric state are evaluated for the first time from investigations of the hyperfine splitting of the λ1=248.792 nm transition by in-gas-cell laser ionization spectroscopy. Ground and isomeric states of neutron-rich Pt199 nucleus were produced by a multinucleon transfer reaction at the KEK Isotope Separation System (KISS), designed for the study of nuclear spectroscopy in the vicinity of N=126. The measured magnetic dipole moments +0.75(8)μN and -0.57(5)μN are consistent with the systematics of those of nuclei with Iπ= 5/2- and Iπ= 13/2+, respectively.
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