Publications by authors named "Mingli Niu"
Using the recently developed threshold photoelectron-photoion coincidence (TPEPICO) velocity imaging mass spectrometer (Tang et al. Rev. Sci.
View Article and Find Full Text PDFUsing the novel threshold photoelectron-photoion coincidence (TPEPICO) velocity imaging technique, the dissociative photoionization of N(2)O molecule via the C(2)Σ(+) ionic state has been investigated. Four fragment ions, NO(+), N(2)(+), O(+), and N(+), are observed, respectively, and the NO(+) and N(+) ions are always dominant in the whole excitation energy range of the C(2)Σ(+) ionic state. Subsequently, the TPEPICO three-dimensional time-sliced velocity images of NO(+) dissociated from the vibrational state-selected N(2)O(+)(C(2)Σ(+)) ions have been recorded.
View Article and Find Full Text PDFArticle Synopsis
- A new TPEPICO imaging spectrometer is developed at the Hefei National Synchrotron Radiation Laboratory, featuring open electron and ion lenses for simultaneous velocity mapping of photoelectrons and photoions.
- The design includes a repelling electric field instead of a traditional accelerating field, enhancing image magnification and minimizing the impact of energetic electrons.
- Energy and mass resolution measurements show a 9 meV resolution for TPES and a mass resolving power above 900, with a practical application demonstrated through oxygen photoionization experiments resulting in precise kinetic energy distribution measurements.