Fine structure and hyperfine structure in the excited configuration 5p ²6s of the antimony I spectrum

Abstract

By optical interference and VUV spectroscopy the doublet system of SbI 5p ²6s was investigated, so that now the hyperfinestructure of all 8 levels of 5p ²6s (A- andB-splitting constants) are known.

From the analysis we receive a spin-orbit parameter ζ_5p =3,538(57) cm⁻¹ and from the hyperfine-analysis single electron splitting constantsa ⁰¹_5p =52.4(4.6),a ¹⁰_5p =−1.6(7.3),a ¹²_5p =72.3(2.3),a ¹⁰_6s =91.7(4.1),b ⁰²_5p =−49.6(1.1) andb ¹¹_5p =30.4(3.2) (all values in mK). For all calculations in the fs- and hfs-analysis the 5p ²6s ² D _3/2 has to be excluded (see discussion).

With the figures given above the quadrupole moment¹²¹ Q(5p ²6s)=−0.44(3) barn was obtained. It is in good agreement with the¹²¹ Q(5p ³).

For the core-polarization by the 5p electron in the innerfieldns-shells (n=1, 2, 3, 4, 5) and the unpaired 6s electron a field of +500(300) kG was obtained.