Resonantly excited cascade x-ray emission from La

We are monitoring the intensity of the La 5p-4d emission for La metal while scanning across the deeper lying 3d-4f photoexcitation resonances of the same atom. A strong resonant enhancement in the integral intensity of the La 5p-4d fluorescence emission is observed, which is due to cascading decay o...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2005-08, Vol.72 (7), p.075129.1-075129.6, Article 075129
Main Authors: MOEWES, A, WILKS, R. G, KOCHUR, A. G, KURMAEV, E. Z
Format: Article
Language:English
Subjects:
ATOMS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DECAY
EMISSION SPECTRA
FLUORESCENCE
LANTHANUM
MATERIALS SCIENCE
PHOTONS
PROBABILITY
RESONANCE
SELF-ABSORPTION
VACANCIES
X RADIATION
X-RAY SPECTRA
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Summary:We are monitoring the intensity of the La 5p-4d emission for La metal while scanning across the deeper lying 3d-4f photoexcitation resonances of the same atom. A strong resonant enhancement in the integral intensity of the La 5p-4d fluorescence emission is observed, which is due to cascading decay of the resonantly excited 3d{sup 9}4f{sup +1} configuration. The corresponding emission spectrum features a complex satellite structure reflecting the multitude of transitions taking place in a variety of multi-vacancy configurations created by the cascade. We calculate the probability of 5p{yields}4d emission produced by the cascading decay and then take into account self-absorption of the emitted photons. This model provides good agreement with the experimental results. The number of 4d vacancies increases immensely due to electronic cascades. We also observe an enhanced integral intensity in the 5p-4d fluorescence compared to our calculations, which we attribute to intra-atomic resonance processes.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.72.075129