Physics – Atomic Physics
Scientific paper
2008-11-19
Phys. Rev. A 78, 052509 (2008)
Physics
Atomic Physics
21 pages, 9 figures
Scientific paper
10.1103/PhysRevA.78.052509
X-ray four-wave mixing signals generated in the $k_1 + k_2 - k_3$ phase-matching direction are simulated for N1s transitions in para-nitroanline and two-ring hydrocarbons disubstituted with an amine and a nitroso groups. The two-dimensional x-ray correlation spectra (2DXCS) provide background-free probes of couplings between core-electron transitions even for multiple core shells of the same type. Features attributed to couplings between spatially-separated core transitions connected by delocalized valence excitations provide information about molecular geometry and electronic structure unavailable from linear near-edge x-ray absorption (XANES).
Mukamel Shaul
Schweigert Igor V.
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