Gas-phase N₂ adsorption on protonated tryptophan and dipeptides, hydrogen-bonded with methanol, was investigated as a model for molecular cloud formation using a tandem mass spectrometer containing a cold ion trap. The number of N₂ molecules adsorbed on H⁺Trp(CH₃OH)_m and H⁺Trp-Gly(CH₃OH)_m (m = 0–3) decreased with increasing number of methanol molecules. The surface of the gas-phase ions was covered by the CH₃ groups of methanol upon solvation, which rendered the solvated cluster ions inactive toward N₂ adsorption. The lack of N₂ adsorption on unsolvated H⁺Gly-Trp was ascribed to its compact conformation, which was driven by the intramolecular interactions.

使用含有冷离子阱的串联质谱仪，研究了质子化的色氨酸和二肽与甲醇氢键合的气相N ₂吸附，作为形成分子云的模型。H ⁺ Trp（CH ₃ OH）_m和H ⁺ Trp-Gly（CH ₃ OH）_m（m = 0-3）上吸附的N ₂分子数量随着甲醇分子数量的增加而减少。溶剂化时，气相离子的表面被甲醇的CH ₃基团覆盖，这使溶剂化的簇状离子对N ₂吸附失去活性。缺乏N ₂未溶剂化的H ⁺ Gly-Trp的吸附归因于其紧凑的构象，这是由分子内相互作用驱动的。