Figure 2.

Off-resonant scattering of a Gaussian X-ray pulse from cysteine for different detection frequencies. On the right, we show the pulse power spectrum in blue, with the detection frequency marked as a red line. The pulse propagation vector is shown as a red arrow, pointing at the molecule aligned in the lab frame, with the scattering pattern shown in the background. (a) The detection frequency ω_s is set equal to the pulse center frequency Ω_p, and the scattering signal is dominated by the elastic term. (b) The detection frequency is set to Ω_p − 9 eV, and the inelastic terms are dominant. (c) Chemical structure (left) and lab-frame orientation (right) of the cysteine molecule (O is red, S is green, N is blue, C is grey, H is white).