$6 p$ photoionization in high- $Z$ elements and the influences of relativistic Cooper minima

Relativistic Dirac-Slater calculations of the photoionization of the

6 p

subshell in elements in the range

82 \leq Z \leq 100

have been performed, examining cross sections, branching ratios, and angular distributions. The zero (Cooper minimum) which appears in the

6 p \to ε d

nonrelativistic matrix element is split into three relativistically, for the matrix elements

6 p_{\frac{3}{2}} \to ε d_{\frac{3}{2}}

6 p_{\frac{3}{2}} \to ε d_{\frac{5}{2}}

, and

6 p_{\frac{1}{2}} \to ε d_{\frac{3}{2}}

. The outstanding feature of our results is the huge energy splitting between these minima, more than an order of magnitude larger than the discrete

6 p_{\frac{3}{2}} - 6 p_{\frac{1}{2}}

splitting. The origin of this phenomenon is discussed along with its consequences for angular distributions and branching ratios.

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6pphotoionization in high-Zelements and the influences of relativistic Cooper minima