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个人信息Personal Information
教授
博士生导师
硕士生导师
主要任职：Professor Dr. Hongbin Ding
其他任职：物理学院学术委员会主任，等离子体联合研究中心主任,中国光学工程学会LIBS专委会副主任, 中国核学会核聚变等离子体分会常务理事，辽宁省物理学会副理事长，国际ITER-ITPA 委员
性别：男
毕业院校：巴塞尔大学
学位：博士
所在单位：物理学院
学科：等离子体物理. 光学工程
联系方式：hding@dlut.edu.cn
电子邮箱：hding@dlut.edu.cn
355 nm laser photoionization of formaldehyde time-of-flight mass spectroscopic study
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论文类型：期刊论文
发表时间：2012-01-01
发表刊物：ACTA PHYSICA SINICA
收录刊物：SCIE、PKU、ISTIC、Scopus
卷号：61
期号：1
ISSN号：1000-3290
关键字：formaldehyde; cluster; time-of-flight mass spectrum; laser ionization
摘要：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 (CH2O)(n)H+(n = 1-4), deprotonated formaldehyde clusters series (CH2O)(n)CHO+ (n = 1-3, and two series based on molecules originating from H2CO ( the deprotonated and protonated forms), H3CO+(H2O)(n = 1, 3, 5) and HCO+(H2O)(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 x 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.