Observation of an anomalous decay ratio between the molecular field split levels in the S 2pcore photoelectron andLVVAuger spectrum ofH2S

The S 2${\mathit{p}}_{3/2}$2${\mathit{p}}_{1/2}$ spin-orbit splitting of ${\mathrm{H}}_2$S has earlier been assigned different values by Auger and x-ray photoelectron spectroscopies. We resolve this apparent ambiguity by presenting very high resolution synchrotron radiation excited Auger and photoelectron spectra, where the molecular field splitting in the ‘‘S 2${\mathit{p}}_{3/2}$’’ photoelectron line is observed to be 110(5) meV. The difference in spin-orbit splitting is explained in terms of a new strong propensity rule for Auger decay from molecular field split levels. A value of 70(10) meV for the S 2p lifetime width in ${\mathrm{H}}_2$S is also obtained.