Quadrupole Hyperfine Structure in the Microwave Spectra of Phosphorous Trichloride and Phosphoryl Chloride

摘要

The quadrupole hyperfine structures of the low rotational transitions in P35Cl3and PO35Cl3have been examined. Calculations of the hyperfine splitting and the Stark effect in theJthinsp;equals;thinsp;1rarr;thinsp;2transition have been made and compared with the experimental results. Measurements of the separation of the two strongest hyperfine components yielded the values minus;53.3thinsp;plusmn;thinsp;1.0 and minus;55.4thinsp;plusmn;thinsp;1.2 Mc/sec for the Psngbnd;Cl bond axis quadrupole coupling constantseqQin the molecules P35Cl3and PO35Cl3, respectively. The Stark effect in theJthinsp;equals;thinsp;1thinsp;rarr;thinsp;2andJthinsp;equals;thinsp;2thinsp;rarr;thinsp;3transitions was analyzed to obtain the values 0.56thinsp;plusmn;thinsp;0.02 and 2.54thinsp;plusmn;thinsp;0.04 D for the dipole moments of PCl3and POCl3, respectively. A phasehyphen;lock klystron stabilization technique was used in recording the spectra to improve the resolution of the spectrograph.