Zeeman-Effekt im Mikrowellenrotationsspektrum der AlF-Molekel / Zeeman Effect in the Microwave Rotational Spectrum of the AIF Molecule

Abstract

The Zeeman effect in the microwave rotational spectrum of 27 Al 19 F has been measured in the ground vibrational state υ = 0 in order to determine the gJ -factor and the molecular magnetic susceptibility anisotropy ξT : gJ=-0.08051(8) ; ξT/h=434(38)Hz/(kG) 2 . The molecular quadrupole moment and its electronic part are derived from the values of g j ,ξT , and the rotational constant B 0 . - The spectrum obtained in the magnetic field exhibits resolvable hyperfine structure from the 27 Al nucleus with spin l = 5/2 and enabled us to determine the magnetic shielding anisotropy of this nucleus: σ T=-224(71)·10 -6 . This value agrees reasonably well with an estimated one obtained from an interrelation with the spin-rotation interaction constant c l .