科研之友
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摘要
At the magic angle, the time-of-flight mass-spectrometer (TOF-MS) profile depends only on the translational energy distribution of photofragment, and is independent of the angle distribution of recoil momentum, therefore, the translational energy distribution is usually determined by fitting the measured TOF-MS profile. Different from the above procedure, we take another approach in the present work. According to this method, by measuring three widths at half maximum (t(1/2)(1/4)(3/4)(), one-fourth Maximum (t)() and three-fourth maximum (t)) of the TOF-MS profile, the averaged translational energy, the width of translational energy distribution, as well as the width of instrumental function can be determined from numeric tables or mathematical expressions. In this method, both the translational energy distribution and the instrumental function are described by Gaussian functions.
- 出版日期2005-5
- 单位中国科学技术大学
