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Formula of [Aun(SR)m]q a species captured in time–course electrospray ionization mass spectra
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aAll clusters are captured as anions by the form of [Aun(SR)m+x Na–y H]q’ (q’ < 0) in ESI-MS analysis (negative ion mode). The net charge of clusters, i.e., q in [Aun(SR)m]q is deduced via the equation q = q’−(x−y).
