Quadrupole moment in the excited 2P1/2state

Computation of the quadrupole moment values in the 2P 1/2 states of hydrogen and meso-hydrogen is carried out. It is shown that allowance for the hyperfine interaction of the electron ( mu - meson) with the proton in the first order of perturbation theory results in giant values of the quadrupole moment of the atoms: Q H =4.0*10 -19 cm 2 , Q M =3.3*10 -21 cm 2 .