Figure 4

Electrolytic spray MS using Pd₄₀Ni₄₀P₂₀ MSR. (A) Electrolytic spray using an amorphous Pd₄₀Ni₄₀P₂₀ MSR is showing peaks of Ni, Pd and P at various composition in the positive ion mode. Crystalline Cu is present as impurity on the surface and hence been electrolytically etched. Complex peak at m/z 309.8 corresponds to PdNiPO(OH)(ACN)₂ which is expanded in the inset and compared with calculated isotope pattern. (B) Tandem Mass spectrometry (MS/MS) of m/z 309.8 at laboratory collision energy 25 V showing Ni and ACN loss and finally resulting in Pd⁺ at higher collision energy. Presence of Ni is also seen at lower mass (expanded in the inset). Collision energy dependent MS/MS spectra are shown in Fig. S6.