Two Photon Inner Shell Transitions In Molybdenum
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- Category: Molybdenum knowledge
- Published on 01 August 2013
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The two-photon x-ray emission spectra of inner-shell transitions in metallic molybdenum have been studied using large-area energy-dispersive Si(Li) detectors and fast, computer-controlled, time-coincidence electronics.
The discrete energy-summation spectrum displays a peak at 17.1 keV corresponding to the expected 2s→1s transition, as well as a second, more intense peak at 19.7 keV.
Based upon very recent analytical H-atom calculations by Florescu, this latter peak is tentatively identified as due primarily to 3d→1s transitions.
The continuous two-photon spectrum has also been measured on an absolute intensity scale and compared with a frozen-orbital calculation based upon direct summation of the second-order perturbation expansion for the relevant matrix elements.
For the 2s→1s transition, excellent quantitative agreement is found using the self-consistent-field Hartree-Fock wave functions of Clementi and Roetti.
The same calculation predicts that the 3s→1s transition is of negligible relative amplitude. Because the calculational method is inapplicable to d states.
A simple closure approximation is developed which is found to be reasonably good for both the 2s and 3s two-photon transitions, but apparently fails for the 3d transition since it predicts a result which is relatively much too small.
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