Collision-induced reaction

The figures of merit of quadrupole-based ICP-MS, such as the precision of isotope ratio measurements and the detection limits, can be improved significantly, especially for elements which are difficult to determine due to the appearance of isobaric interferences (e.g., by the trace, ultratrace and/or isotope ratio measurements of Ca, Fe, S, As, I or Se).16-22 The occurrence of interference problem can be minimized by the insertion of a collision/reaction cell in ICP-MS as the result of defined collision induced reactions using selected collision/reaction gases or gas mixtures (such as H2, He, NH3, 02, CH4 and others). For each analytical problem, which is different, e.g., for U or... 

Collision induced reactions are also applied in ICP-MS with an ion trap for high mass resolution measurements. Two instrument configurations of the plasma source ion trap (PSIT) are shown in Figure 5.8 a and b, respectively. PSIT I utilizes a linear quadrupole for ion transport and mass selection (Figure 5.8 a) while the PSIT II applies direct injection of ions into the trap (without... 

A pressure study was made by Bowie and Stapleton to learn something of the mechanism of formation of the doubly-charged negative ions. They considered the collision-induced reaction... 

Fig. 18. Experimental setup for the collision-induced reaction of size-selected cluster ions with gas phase molecules.

The chapters of this book are all theoretical in character. This reflects the fact that the conical intersection is a theoretical concept, and as such is not directly accessible to experimental observation. Nevertheless, the concepts, techniques and results discussed in this book are crucial for the interpretation of the observations in time-resolved spectroscopy and chemical kinetics on femtosecond time scales. It is hoped, therefore, that this book is of value not only for the theoretician, but also for the practitioneer in molecular spectroscopy, photochemistry, and collision-induced reaction dynamics. 

Consider a binary mixture of constituents A and B, and assume that the reversible isomerization is a collision-induced reaction. There are then four elementary reactive processes which may occur upon binary collision in the system ... 

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