物理学报2012，Vol.61Issue(1)：114-120,7.
355 nm激光光电离甲醛飞行时间质谱的研究
355 nm laser photoionization of formaldehyde time-of-flight mass spectroscopic study
摘要
Abstract
Multiphoton ionization of formaldehyde hydrated clusters is studied by time-of-flight mass spectrometry using 5 ns,355 nm Nd： YAG laser beam with a power intensity of 10~（11） -10~（12） W/cm~2.The main products including protonated formaldehyde cluster series （CH_20）_nH~＋（n = 1-4）,deprotonated formaldehyde clusters series（CH_20）_nCHO~＋（n = 1-3,and two series based on molecules originating from H_2CO（the deprotonated and protonated forms ）,H_3CO~＋（H_O）_nn = 1,3,5） and HCO~＋（H_2O）_n（n = 1,3,5） are observed,and the simple structures are gave for some clusters.The transformation of formaldehyde mass peak is studied in different laser power density conditions.We find the ion peaks of formaldehyde monomer and water molecle ar a laser intensity of about 9.3×10~（11） W/cm~2.Those mass peaks exist in envelope form and cannot be resolved under our experiment condition.The simple dynamic plasma sheath accelerating model is proposed to explain the physical mechanism of the envelope phenomenon.关键词
甲醛/团簇/飞行时间质谱/激光电离Key words
formaldehyde/cluster/time-of-flight mass spectrum/laser ionization分类
化学化工引用本文复制引用
王燕,姚志,冯春雷,刘佳宏,丁洪斌..355 nm激光光电离甲醛飞行时间质谱的研究[J].物理学报,2012,61(1):114-120,7.基金项目
国家自然科学基金 （）
辽宁省科学基金 （）
教育部科技重点项目（批准号：108034）和教育部博士点基金（批准号：20081411040）资助的课题~~ （）
