Measurement of the fine structure splittings of atomic Se and Sn in their ground 3P states

Abstract

Magnetic dipole transitions between the fine structure components of atomic Se and Sn in their ground 3P states have been observed by the technique of carbon monoxide laser magnetic resonance. The fine structure intervals have been measured much more accurately than previously. For Se, the 3P1-3P2 transition was detected. Measurements were made for 77Se through the nuclear hyperfine splitting (I= 1/2 ) and for 78Se and 80Se by the observation of Lamb (saturation) dips. The J=1-2 interval was measured as 1989.49812(75), 1989.49798(36) and 1989.49831(36) cm-1 for 77Se, 78Se and 80Se respectively. The 80Se-78Se isotopic shift has been measured very accurately from saturation dips. The gJ-factor for the 3P2 component was estimated to be 1.49129(14) from Zeeman splittings. The parameters which describe the hyperfine splitting for 77Se, were determined to be A1=-137(88) MHz and A2=544(45) MHz. For Sn, both J=1 from 0 and 2 from 1 transitions were detected. Hyperfine structure was observed, but not resolved, for 117Sn and 119Sn, both of which have I= 1/2 . The J=1-0 interval was measured to be 1691.807 65(75) and 1691.807 10(75) cm-1 for the unresolved pairs 117119/Sn and 118120/Sn respectively. The J=2-1 interval for the unresolved pair 118120/Sn was determined to be 1735.864 05(75) cm-1.