期刊
出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nimb.2007.04.186
关键词
photoionization; fragmentation; imaging; velocity map; coincidence
We have built a velocity map imaging (VMI) spectrometer optimized for angle-resolved photoionization experiments with synchrotron radiation (SR) in the VUV and soft X-ray range. The spectrometer is equipped with four electrostatic lenses that focus the charged photoionization products onto a position-sensitive multi-hit delay-line anode. The use of two additional electrostatic lens elements as compared to the standard design of Eppink and Parker [A.T.J.B. Eppink, D.H. Parker, Rev. Sci. Instr. 68 (1997) 3477] provides better focusing of an extended interaction region, which is crucial for most SR applications. Furthermore, the apparatus is equipped with a second micro-channel plate detector opposite to the VMI spectrometer, enabling electron-ion coincidence experiments and thereby mass-resolved ion spectroscopy independent of the time structure of the synchrotron radiation. First results for the photofragmentation Of CO2 molecules are presented. (c) 2007 Elsevier B.V. All rights reserved.
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