POLARIZATION EFFECTS IN MOLECULAR X-RAY FLUORESCENCE

Issue		J. Phys. Colloques Volume 48, Number C9, Décembre 1987 X-Ray and Inner-Shell Processes Vol. 1


Page(s)		C9-761 - C9-763
DOI		http://dx.doi.org/10.1051/jphyscol:19879132

X-Ray and Inner-Shell Processes
Vol. 1

J. Phys. Colloques 48 (1987) C9-761-C9-763
DOI: 10.1051/jphyscol:19879132

POLARIZATION EFFECTS IN MOLECULAR X-RAY FLUORESCENCE

D.W. LINDLE¹, P.L. COWAN¹, R.E. LaVILLA¹, T. JACH¹, R.D. DESLATTES¹, R.C.C. PERERA² and B. KARLIN³

¹ National Bureau of Standards, Gaithersburg, MD 20899, U.S.A.
² Center for X-Ray Optics, Lawrence Berkeley Laboratory, Berkeley, CA 94720, U.S.A.
³ National Synchrotron Light Source. Brookhaven National Laboratory, Upton, NY 11973, U.S.A.

Abstract
Highly polarized x-ray fluorescence has been observed following K-shell excitation of several Cl-containing molecules. Monochromatic synchrotron radiation (SR) with a high degree of linear polarization was used to resonantly excite Cl 1s electrons in CH₃Cl, and the three Freons, CF₃Cl, CF,Cl₂, and CF₃Cl. The subsequent Cl Kβ fluorescence was found to be strongly linearly polarized. The direction of polarization of the Kβ fluorescence is determined in part by the symmetry of the valence-orbital electron involved in the fluorescence decay which fills the Cl 1s hole. Our results illustrate that the core-level resonance lifetimes are short enough to preclude substantial disorientation of the molecule prior to fluorescence decay. Measurements of this type may prove to be a sensitive probe of orbital symmetry in more complicated molecular systems, condensed matter, and adsorbates.

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