中文摘要：

基本胆固醇与红外激光 desorption/tunable 同步加速器真空被分析紫外光电游离团 spectrometry。胆固醇的一个独占的分子的离子被近的阀值观察有高效率的单个光子的电离。碎片随光子精力的增加被产出。各种各样的碎片的结构与商业电子电离 time-of-flight 团 spectrometry 被决定。主导的破碎小径在 ab initiocalculations 的帮助下详细被讨论。

英文摘要：

Elementary cholesterol was analyzed with IR laser desorption/tunable synchrotron vacuum ultraviolet photoionization mass spectrometry. An exclusive molecular ion of cholesterol is observed by near threshold single-photon ionization with high efficiency. Fragments are yielded with the increase of photon energy. The structures of various fragments are determined with commercial electron ionization time-of-flight mass spectrometry. Dominant fragmentation pathways are discussed in detail with the aid of ab initio calculations.