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Chirp-dependent ionization of hydrogen atoms in the presence of super-intense laser pulses

Chinese Physics B 2021年第9期30卷 267-273页

作者： Fengzheng Zhu Xiaoyu Liu Yue Guo Ningyue Wang Liguang Jiao Aihua Liu Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China School of Mathematics and Physics Hubei Polytechnic UniversityHuangshi 435003China College of Physics Jilin UniversityChangchun 130012China

We perform a theoretical study on dynamic interference in single photon ionization of ground state hydrogen atoms in the presence of a super-intense ultra-fast chirped laser pulse of different chirp types(equal-power and equal-FWHM laser pulses)by numerically solving the time-dependent Schrödinger equation in one *** investigate the influences of peak intensity and chirp parameters on the instantaneous ionization rate and photoelectron yield,*** also compare the photoelectron energy spectra for the ionization by the laser pulses with different chirp *** find that the difference between the instantaneous ionization rates for the ionization of hydrogen atom driven by two different chirped laser pulses is originated from the difference in variation of vector potentials with time.

关键词： ultrafast laser field single photon ionization quantum interference

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Protonated acetone ion chemical ionization time-of-flight mass spectrometry for real-time measurement of atmospheric ammonia

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Journal of Environmental Sciences 2022年第4期34卷 66-74页

作者： Fengshuo Dong Hang Li Bing Liu Ruidong Liu Keyong Hou Environment Research Institute Shandong UniversityQingdao 266237China Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Ammonia(NH_(3))is ubiquitous in the atmosphere,it can affect the formation of secondary aerosols and particulate matter,and cause soil eutrophication through ***,the use of radioactive primary reagent ion source and the humidity interference on the sensitivity and stability are the two major issues faced by chemical ionization mass spectrometer(CIMS)in the analysis of atmospheric *** this work,a vacuum ultraviolet(VUV)Kr lamp was used to replace the radioactive source,and acetone was ionized under atmospheric pressure to obtain protonated acetone reagent ions to ionize *** ionization source is designed as a separated three-zone structure,and even 90 vol.%high-humidity samples can still be directly analyzed with a sensitivity of sub-ppbv.A signal normalization processing method was designed,and with this new method,the quantitative relative standard deviation(RSD)of the instrument was decreased from 17.5%to9.1%,and the coefficient of determination was increased from 0.8340 to *** humidity correction parameters of the instrument were calculated from different humidity,and the ammonia concentrations obtained under different humidity were converted to its concentration under zero humidity condition with these correction *** analytical time for a single sample is only 60 sec,and the limit of detection(LOD)was 8.59 pptv(signalto-noise ratio S/N=3).The ambient measurement made in Qingdao,China,in January 2021 with this newly designed CIMS,showed that the concentration of ammonia ranged from 1 to 130 ppbv.

关键词： Ammonia(NH_(3)) Chemical ionization mass spectrometer(CIMS) Vacuum ultraviolet(VUV)lamp single photon ionization Real-time analysis

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Selective Dehydrogenation of Diaminobenzenes by Deep Ultraviolet single photons

Selective Dehydrogenation of Diaminobenzenes by Deep Ultravi...

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第十五届全国化学动力学会议

作者：吴海铭 Zhixun Luo State Key Laboratory for Strucutral Chemistry of Unstable and Stable species Institute of ChemistryChinese Academy of Sciences

single-photon ionization mass spectrometry(SPI-MS) is known as an important technique available for chemical identification because organic molecules are readily fragmented under usual laser radiation.1 The use of deep ultraviolet(DUV) radiation takes advantages for SPI-MS especially for the compounds with ionization potentials below the energy of a single DUV *** 177.3-nm all-solid-state DUV laser single-photon ionization based on our customed time-of-fight mass spectrometer(TOF-MS) system has a unique advantage in distinguishing diaminobenzenes isomers which possess ionization energies close to 7.0 eV. The reasonable performance is attributed to the synergistic effect of short pulse duration,high single photon energy,and high photon flux of the all-solid-state DUV laser and distinguishing merits of *** is found that the dramatic selectivity of diaminobenzenes isomers pertains to varied photochemical processes initiated by the DUV laser radiation.A single-photon ionization process dominates for 1,4-diaminobenzene(PPD) resulting in a fragmentation-free mass spectrum;photo-induced dehydrogenation is observed for 1,2-diaminobenzene(OPD) and 1,3-diaminobenzene(MPD).The dramatic intensity ratio of the molecule parent ion relative to its dehydrogenation fragment reveals selective C-H activates under the DUV single photons.

关键词： deep ultraviolet laser time-of-fight mass spectrometer diaminobenzenes isomers single photon ionization

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