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Schematic of experimental setup, top view. Inset with projection of interaction region: jet, collimation slit geometry, and Si drift detectors (D).
X-ray absorption spectrum of near the -edge. Experimental data (dots). The Br resonance of at is marked with a vertical line. The fitted components and their sum are shown: Br resonance (dash dot), -edge (dashed), and sum (solid).
(a) Laser/x-ray cross correlation for laser-aligned , ∥/⊥ absorption as a function of laser/x-ray delay. Theory for a rotational temperature is overlaid. (b) Calculated for a (FWHM) laser pulse with an intensity of for .
Laser-on/laser-off ratio of Br fluorescence induced by x-ray excitation on the Br resonance of at , as a function of . and 90° correspond to the parallel and perpendicular configurations for laser and x-ray polarizations. Theory for is the overlaid curve.
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