Abstract
Guanosine 5′-monophosphate (GMP) is a component in RNA, which functions as a messenger in biological systems. Infrared multiphoton dissociation (IRMPD) spectroscopy, combined with IR-laser ablation of a droplet beam, reveals that the most stable conformer of gas-phase protonated GMP has a keto form and an anti-conformation. This includes two types of rotamers with different orientations of OH groups in the sugar ring. This suggests that our own laser ablation of droplet beam method promotes conformation-selective IRMPD spectroscopy with an effective cooling system in the gas phase.
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