Vibrationally induced nuclear quadrupole coupling in thev3=1 state of189OsO4

摘要

Electric nuclear quadrupole hyperfine structure arising from a quadrupolar nucleus at the center of tetrahedral molecules, such as189OsO4, is symmetry forbidden. However, through vibrationndash;rotation distortion a small nuclear quadrupole coupling is induced. The hyperfine structure due to the vibrationally inducedeqQhas been measured for a number ofPhyphen; andRhyphen;branch transitions in the ngr;3fundamental of189OsO4, by using inverse Lamb dip spectroscopy. Microwave modulation sidebands of CO2laser lines have been used as the tunable infrared radiation. From the analysis of the observed hyperfine structure patterns, the values of the scalar and tensor coupling constants have been determined to be khgr;Vs=minus;4.103plusmn;0.048 MHz and khgr;Vt=minus;3.090plusmn;0.059 MHz.