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7 results on '"Li, Fang-Li"'

3. Investigation of trace p-dichlorobenzene using laser mass spectrometry

Author

Jing Ma Jing Ma, Lei Ding Lei Ding, Li Fang Li Fang, and Weijun Zhang Weijun Zhang

Subjects
Materials science, Mass spectrometry, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention, Wavelength, law, Excited state, Ionization, Mass spectrum, Laser power scaling, Electrical and Electronic Engineering, Atomic physics, Ground state
Abstract

The time-of-flight mass spectrum (TOFMS) relative to the resonant two-photon ionization of gas phase p-dichlorobenzene was obtained in the wavelength range of 240-250 nm by a home-made system. A special design was made to reduce the effect of memory on the inner wall of the sample inlet system suitable for the investigation of semi-volatile organic compound. In this wavelength range, p-dichlorobenzene molecules firstly absorbed one photon to be excited from the ground state 1Ag(S0) to the first excited state 1B2u(S1), then absorbed another photon to be ionized. The relationship between the signal intensity of p-dichlorobenzene molecular ion C6H435Cl+2 at 248-nm wavelength and the laser power was given. The 1.52 power index of C6H435Cl+2 was a typical identification of the 3/2 power law. The relationship between the ion signal intensity of C6H435Cl+2 and the sample concentration was close to a linear one in the ppm(V/V) range, which led to a detection limit of 125 ppb(V/V) for p-dichlorobenzene.

Published
2008

5. Measurement of algae PSII photosynthetic parameters using high-frequency excitation flashes

Author

Chaoyi Shi, Chaoyi Shi, primary, Yujun Zhang, Yujun Zhang, additional, Gaofang Yin, Gaofang Yin, additional, Nanjing Zhao, Nanjing Zhao, additional, Jingbo Duan, Jingbo Duan, additional, Xiaoya Yu, Xiaoya Yu, additional, Xue Xiao, Xue Xiao, additional, Tingting Gan, Tingting Gan, additional, Li Fang, Li Fang, additional, and Wenqing Liu, Wenqing Liu, additional

Published
2014
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