Molecular Beam Magnetic Resonance Spectra of TlCl35and TlCl37at Zero Field

Abstract

The molecular beam magnetic resonance method has been used to investigate the spectra of Tl${\mathrm{Cl}}^{35}$ and Tl${\mathrm{Cl}}^{37}$ at zero field. A splitting of the quadrupole line for both isotopes is observed and is attributed to a cosine coupling of the form $c_a\mathbf{I}·\mathbf{J}$, between the chlorine spin ${\mathbf{I}}_a$ and the rotational angular momentum of the molecule J.