Photodissociation (PD) spectroscopy of protonated guanosine monophosphate (GMPH+) ions was performed using IR-laser ablation of droplet beam and quadruple ion trap techniques. Photofragmentation of GMPH+ gave a protonated guanine ion (GH+) as the main product. A wide-range PD spectrum (3.9 ∼ 5.4 eV) monitored by the GH+ ion intensity showed four characteristic electronic transitions related to their three different anti glycosyl-bond conformers of GMPH+, which were identified by their π-π* transitions based on time dependent density functional theory calculation. Furthermore, the narrow-bandwidth PD spectrum (4.28 ∼ 4.33 eV) shows the existence of syn glycosyl-bond conformation with keto form.

质子化的单磷酸鸟苷（GMPH +）离子的光解离（PD）光谱是使用液滴束的红外激光烧蚀和四重离子阱技术进行的。GMPH +的光裂解产生质子化的鸟嘌呤离子（GH +）作为主要产物。甲宽范围PD谱（3.9〜5.4电子伏特）监测由GH +离子强度显示与他们的三个不同的四个特征的电子跃迁抗GMPH +，其中鉴定可以通过π-π的糖基键的构象异构*跃迁基于时间相关的密度泛函理论计算。此外，窄带宽PD光谱（4.28〜4.33eV）表明存在具有酮形式的顺式糖基键构象。