High-accuracy laser spectroscopy of $${{f{H}}}_{{f{2}}}^{{oldsymbol{+}}}$$ and the proton–electron mass ratio - Nature

High-accuracy laser spectroscopy of $${{f{H}}}_{{f{2}}}^{{oldsymbol{+}}}$$ and the proton–electron mass ratio  Nature ...

High-accuracy,laser,spectroscopy,of,$${{f{H}}}_{{f{2}}}^{{oldsymbol{+}}}$$,and,the,proton–electron,mass,ratio