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Citation: SHI Yong, ZHOU Xiao-guo, ZHAO Ying-guo, LIU Shi-lin, MA Xing-xiao. An Investigation on Space-charge Effect in the Time-of-flight Mass Spectrometry[J]. Acta Physico-Chimica Sinica, ;2005, 21(11): 1269-1273. doi: 10.3866/PKU.WHXB20051115 shu

An Investigation on Space-charge Effect in the Time-of-flight Mass Spectrometry

1.
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026

Received Date: 11 May 2005
Available Online: 15 November 2005

In the multi-photon ionization experiment, the parent ion peak of time-of-flight (TOF) was observed to become broader with increasing laser power. Briefly, this phenomenon is caused by the space-charge effect of ions. A qualitative theoretical model, that the ion cloud created by the laser has a spherical form and the initial charge distribution is Gaussian, is used to evaluate the full width at half maximum (FWHM), which depends on the laser intensity, the pressure of the sample gas, the extraction electric field, the ionic mass, and the focal length of the lens employed. The proposed model agrees well with the experimental data.
- TOF;Coulomb expansion;Space-charge effect
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