High-Resolution Laser Spectroscopy in Sm I by Tunable Diode Laser

Abstract

High-resolution laser spectroscopy in Sm I has been performed by using a tunable diode laser together with a highly collimated atomic beam. Hyperfine structures and isotope shifts of Sm isotopes have been measured for four transitions in the wavelength region of 636--687, nm; the largest isotope shift has been observed. Hyperfine constants A and B of ¹⁴⁷Sm and ¹⁴⁹Sm have been determined for six levels. By using the purest s²-sp transition with the largest isotope shift, nuclear parameters λ, changes in mean-square nuclear charge radii δ ‹ r²›, and nuclear deformation parameters δ ‹ β ²› have been derived and discussed.