HYPERFINE STRUCTURE STARK EFFECT AND ZEEMAN EFFECT OF $Rb^{83}F^{19}$

Author Institution: Physikalisches Institut der Universit\""{a}t BonnA molecular beam resonance apparatus with electric fourpole lenses as A- and B-fields and with parallel superimposed electric and magnetic transition fields was used. Molecules in different rotational states are separated by the A-field. Spectra of molecules in different vibrational states are resolved by their different Stark effect energies. By this means the versatility of a pure magnetic apparatus is combined with the good resolving power of a pure electric apparatus, i.e. magnetic and electric properties can be measured in definite states. The spectrum of RbF has been measured under weak field and strong field conditions in the region 20-400 V/cm and 0-4000 Gauss for $J = I$ and $v = 0.1$. One is able to analyse the spectrum completely using the Hamiltonian: $\begin{array}{c}\mathcal{H} = BJ^{2} - (\mu_{e1}E)-\frac{\mu_{1}}{I_{1}}[I_{**}(1 - \partial)\cdot H] - \frac{\mu_{2}}{I_{2}}[I_{2} \cdot (1 -\partial_{2})\cdot H] - \frac{\mu_{**}}{J}(JH)\frac{1}{2}(H \cdot \xi \cdot H) - (I_{1} \cdot eq Q \cdot I_{1}/ f(I_1)\\ + c_1 (I_{1} J) + c_{2} (I_{2}J) + I_{1}\cdot d \cdot I_{2})\end{array}$ In general, the interaction constants are obtained by various independent line-combinations. The results are: $\begin{array}{lccc}Constant & Dimension & v = 0 & v=1\\ \mu(1 - \partial)/h (Rb) & \mu_{K} & 1.3474(5) & 1.3473(7)\\ \mu_{J}/hJ & \mu_{B} & -29.79(2)\cdot 10^{-6} & -29.71(2)\cdot 10^{-6}\\ \partial_{T} (Rb) & & -1.26(69)\cdot^{-4} & -0.8(11)\cdot 10^{-4}\\ c/h(F) & kHz & 10.4(7) & 10.6(4)\\ d**/h & kHz & 0.36 (23) & 1.0(13)\\ d_{T}/h & kHz & 0.69(22) & 0.81(23)\\ \partial_{T}(F) && 0.88(10)\cdot 10^{-4} & 0.72(5) \cdot 10^{-4}\\ eqQ/h(Rb) & MHz & -70.3410(26) & -69.556(11)\\ c/h(Rb) & kHz & 0.479(48) & 0.52(20)\\ \xi_{T}/h & kHz/Gauss^{2} & 6.1(17)\cdot10^{-7} & 7.7(126)\cdot 10^{-7}\\ \mu_{01} & Deb & 8.535(4) & 8.605(4)\end{array}$ From these quantities the quadrupole moment of the electronic charge distribution has been derived. This value is compared with those of the other alkali halides