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Estimated cleavage process of DPDTe, DPDSe, and DPDS. (A) Electron density of DPDTe, DPDSe, and DPDS determined by ab initio quantum chemical calculations. The darker the black, the higher the electron density. (B) Energy diagram of DPDTe, DPDSe, and DPDS in heterolytic cleavage process.
