Stability diagram analyzer

Fig. 4.33. Stability diagram for a linear quadrupole analyzer showing four stability regions (I-IV) for X- and y-motion. Reproduced from Ref. [109] with permission. John Wiley Sons Inc., 1986.

Fig. 4.34. Detail of the upper half of region I of the stability diagram for a linear quadrupole analyzer. Reproduced from Ref. [104] with permission. World Scientific Publishing, 1993.

Figure 3.8 Stability diagram for a linear quadrupole mass analyzer, the first stability region showing a line scan. If the rf and dc voltages applied to the quadrupole are adjusted so that an ion mass m3 is inside the tip of the stability region, then heavier ions of mass m2 and m, and lighter ions m4 are outside the stability region and are filtered out.

To test our method, we have analyzed the CB stability diagrams for a SSJ and a DSJ. Our results are all consistent with the results of experiments and the master-equation approach. We showed, that the improved lesser Green function gives better results for weak molecule-to-contact couplings, where a comparison with the master equation approach is possible. 

Early theoretical work by Dedieu and coworkers focused on individual elementary transition metal (TM) reactions for the hydrogenation of ethylene using a model of Wilkinson s catalyst [RhCl(PPH3)3] [3-6]. They used LCAO-MO-SCF calculations to perform an orbital analysis of the oxidative addition step, determine intermediate stability, and analyze the olefin insertion step. Using SCF calculations and orbital correlation diagrams for the valence orbitals of the reactants and products, they analyzed the feasibility and geometry of the oxidative addition shown in (1). 

Over the years, several methods of isolating ions in a QIT have been implemented. Methods include RF/DC isolation, forward and reverse RF resonance ejection isolation, " and various forms of TWF isolation. " The RF/DC isolation methods position the ion of interest near the boundaries of the stability diagram for isolation. In this case, the parameter is set to a nonzero value (see RF/DC isolation point in Figure 9.3b). The RF resonance ejection method sweeps the main RF amplitude and/or the resonance ejection frequency in both the forward and/or reverse directions to eject all but the ion of interest. This technique has been shown to yield high-resolution isolations and can be used to analyze multiply charged ions. ... 

The mean-field SCFT neglects the fluctuation effects [131], which are considerably strong in the block copolymer melt near the order-disorder transition [132] (ODT). The fluctuation of the order parameter field can be included in the phase-diagram calculation as the one-loop corrections to the free-energy [37,128,133], or studied within the SCFT by analyzing stability of the ordered phases to anisotropic fluctuations [129]. The real space SCFT can also applied for a confined geometry systems [134], their dynamic development allows to study the phase-ordering kinetics [135]. 

In this section, we analyze the stable geometries for the Na4 and Mg4 clusters, using molecular orbital (MO) correlation diagrams interpolating between geometries. Structure deformation is often correlated with symmetry breaking, e.g. the Jahn-Teller effect (37), which stabilizes the electronic structures of metal clusters. 

---