A study is made of the magnetic moment of the vibrationally excited mo
lecules of the symmetric top type in the states with a non-zero vibrat
ional angular momentum. The formula is obtained for the electronic con
tribution to the vibrational magnetic moment connected with the vibron
ic interactions in the molecule. Calculations of the vibrational g-fac
tor of the molecular ion H-3+ are carried out in the SCF approximation
.