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\b\f1\fs32 Two-photon decay of the single K-shell-hole state in mercury 
\par }{\f1 (poster) 
\par 
\par M. Uroic, M. Majer and K. Ilakovac 
\par 
\par Department of Physics, Faculty of Science, University of Zagreb, Bijenicka 32, HR-10000 Zagreb, Croatia 
\par 
\par Measurements of two-photon decay of the single K-shell-hole state in mercury have been made. The decay of radioactive }{\f1\super 201}{\f1 
Tl was used to generate the single-hole states. The radioactive source was placed between two planar germanium detectors in a close 180}{\f1\super 0}{\f1  g
eometry. Pulses from the detectors were fed into a three-dimensional (128*512*512)-channel pulse-height analyzer and recorded in a PC. Two-dimensional E1-E2 energy spectra have been made from the records of coincidence data. The continuous spectra along t
he sum-energy lines E1 + E2 = transition energy,  corresponding to the two-photon transitions of the 2s, 3s, 3d and 4sd electrons to the 1s single-hole, have been derived. The 2s }{\f3 \'ae}{\f1  1s spectrum shows a broad maximum at mid-energy. The 3s }{
\f3 \'ae}{\f1  1s spectrum is similar but of smaller transition probabilities. The 3d }{\f3 \'ae}{\f1  1s spectrum is very strong and shows a minimum at mid-energy, increasing steadily up to the resonance corresponding to the 3d }{\f3 \'ae}{\f1  2p }{\f3 
\'ae}{\f1  1s cascade of L and K X-rays. The 4sd }{\f3 \'ae}{\f1  1s spectrum is similar to the 3d }{\f3 \'ae}{\f1 
 1s spectrum, but of lesser intensity. The spectra have been fitted by the non-relativistic transition probablilites derived using hydrogen-like wave functions (V. Florescu et al., Phys. Rev. A 36, 2155 (1987)), modified for realistic energies of K a
nd L X-ray transitions and radiation damping. Shapes of the spectra are fairly well reproduced. 
\par 
\par }{\b\f1 Key words:}{\f1  two-photon decay, mercury, spectra
\par }{\b\f1 Corresponding author:}{\f1  K. Ilakovac, tel.: +385-1-4680055, fax.: +385-1-4680336, e-mail: ilakovac@phy.hr
\par 
\par }}