Ion attachment techniques

Fujii T, Arulmozhiraja S, Nakamura M, Shiokawa Y. Mass spectrometry for on-line monitoring of perfluoro compounds using Li ion attachment techniques. Anal Chem. 2001 73 2937 0. 

Fujii X, Syouji K. Mass spectrometric detections of neutral radicals in CH microwave discharge by usage of LP ion attachment techniques. J Appl Phys. 1993 74 3009-12. 

Fig. 6.2 Schematic of an Aerodyne aerosol mass spectrometer (AMS). Vaporized aerosol species are ionized and analyzed via mass spectrometry. This figure shows the ion attachment version of ionization methods. Other existing versions of the AMS that utilize several unique ionization methods and developments that are not shown in this schematic are discussed in the text. Extended drawing of flash vaporizer system shows that the particle beam first impacts on a vaporizer, and volatile aerosol components that vaporize are subsequently subjected to cationization. The unique feature of this detection scheme is the fact that a vaporizer is directly coupled into an ion attachment technique to enable a two-step particle vaporization and ionization process. The separation of the vaporization and ionization processes allows for quantitative detection of aerosol mass with the AMS. (Reprinted with permission from Ref [8]. 2007, John Wiley and Sons)...

Ion attachment mass spectrometry (lAMS) has proven to be a rMque method that complements electron-impact ionization mass spectrometry for the determination of components in chemical processes and environments, such as microwave discharge plasma. The identification of intermediate free radicals and other species in chemical reactions is particularly challenging. One of the greatest advantages of lAMS is that it can be used to directly analyze gaseous compounds. The features that allow this system to detect the intermediate free radicals (refer to Sect. 5.2.4) and novel molecular species produced in various plasmas have been extensively explored (Sect. 5.2.7), and lAMS techniques can be used to identify and quantify compounds and mixtures under plasma and pyrolysis (Sect. 6.4) conditions. To extend the ion attachment technique to ion trap mass spectrometry (Sect. 6.5) or time-of-flight mass spectrometry (Sect. 6.6) has been realized. 

Chapter 6 describes the concept of hybrid mass spectrometric system with ion attachment technique as ionization method. A combined (hypemated) MS represents time-of-flight (TOP), ion trap quadmpole, ion mobility spectroscopy, ion cyclotron resonance (ICR) or aerosol MS, while descriptions of specially designed inlet system include chromatographic introduction (inlets), and various pyrolysis probes for evolved gas analysis. Some applications of each technology are presented, together with representative and/or illustrative examples. In addition, development of portable lAMS is provided along with explanations and spectral applications. 

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