A core-excited peptide model, N-methylformamide, and its isotopically substituted species were used to resolve the channels of specific dissociation. The variation of each product branching ratio with photon energy from three isotopically substituted molecules was measured. From the branching ratios of the products with varied ratios of mass to charge, the variation of the branching ratio of each dissociation channel was resolved. The obvious specific reaction mechanism dominantly involves only the dissociation channel that involves breaking the peptide bond and eliminating two hydrogen atoms to form CNH₂⁺. An element-specific dissociation was observed on breaking a CO bond.

核心激发的肽模型N-甲基甲酰胺及其同位素取代的物质用于解析特定解离的通道。测量了来自三个同位素取代分子的每个产物支化比随光子能量的变化。从质荷比变化的产物的支化比，解决了每个解离通道的支化比的变化。明显的特异性反应机理主要仅涉及解离通道，该解离通道涉及破坏肽键并消除两个氢原子以形成CNH ₂ ⁺。在破坏C O键时观察到元素特异性解离。