Fig. 2.

(A) The acceptor control stimulated X-ray Raman process invoked by two X-ray pulses, of which the carrier frequencies ${\omega }_1^0$ are resonant with the cobalt (acceptor) local core excitation and ${\omega }_2^0$ is resonant with the bridge to cobalt emission transition, respectively. (B) The two pulses ${\mathrm{ℰ}}_1$ (blue) and ${\mathrm{ℰ}}_2$ (red) in the time domain with their phases ${\varphi }_1$ and ${\varphi }_2$, respectively. See SI Appendix, Eq. S14 for detailed expressions. (C) The two pulses in the frequency domain with the carrier frequencies ${\omega }_1^0=\mathrm{7,720.65}$ eV and ${\omega }_2^0=\mathrm{7,721.53}$ eV, bandwidths ${\sigma }_1={\sigma }_2=3$ eV, and the maximum field intensities $E_1=E_2=5\times {10}^{11}$ V/cm. The amplitude ratio η is defined as $E_2/E_1$. See SI Appendix, Eq. S15 for expressions.