By Hans-D. Beckey, R. Belcher, H. Freiser
Box Ionization Mass Spectrometry makes a speciality of advancements in box ionization (FI) mass spectrometry and describes its purposes in actual chemistry, with emphasis on mass spectrometric difficulties. Physico-chemical difficulties in addition to difficulties of chemical research are thought of in line with concerns equivalent to the chance of box ionization; box dissociation and cost distribution; kinetics of ion decomposition in excessive fields; detrimental ions; floor diffusion; activation of FI emitters; and elucidation of the constructions of natural compounds.
This booklet is created from 4 chapters and starts off with a brief assessment on probably the most very important instructions of analysis in FI mass spectrometry. major fields of analysis are mentioned: physico-chemical investigations and quantitative research or structural choice of natural ingredients. the following bankruptcy is dedicated to focusing and non-focusing resources of FI and covers issues reminiscent of equipment for creation of FI counsel and skinny wires, including using advice and carbon filaments as FI emitters. The final chapters concentrate on the appliance of the FI mass spectrometer to physico-chemical difficulties and to quantitative research of homologous sequence of natural components reminiscent of alkanes, alkenes, alkynes, amines, and alcohols.
This monograph is meant essentially for chemists and mass spectrometrists.
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Extra info for Field Ionization Mass Spectrometry. International Series of Monographs in Analytical Chemistry
19. for t h e case of helium. The evaporation field and t h e ion current fall with increasing temperature, and t h e point of inflection of the curves increases. The F I current of organic molecules also Î0'9 Amps 10-^0 CD o c: IO-" 10-12 3 U 5 6 7V/Â 8 Field FIG. 18. FI current-voltage curves of helium for various metals at 77 °K (p = 6 X 10~3 Torr). The curves are normalized to a common radius of 480 Â. The curves end at the evaporation field strength (according to Southon and Brandon t48i).
The typical length of the etched p a r t is about 3 m m . The effective emission length is then about 2 m m which is sufficient if the wire is mounted in a position vertical to t h e cathode slit of about 1 m m width, as shown in fig. 9. A larger length of the wire increases t h e possibility of rupture of the wire. For etching of a limited length of t h e wire t h e following pro cedure is suitable. First, t h e Wollaston wire is bent t o t h e shape shown in fig. 21. and spotwelded t o t h e wire holder, and a rod 48 F I E L D IONIZATION SOURCES of about 2 m m diameter is heated in a flame and subsequently brought in contact with a wax candle.
Wollaston wire with wire holder and etching bath. 1 μιη 0,8=1 molar KCN solution. ). used in F I mass spectrometry. The silver cover is etched away over t h e length which is desired for F I work (usually a few mm). Wollaston wires can be pre-shaped and fixed into wire holders prior to etching, and t h u s t h e thin and fragile central wires can be handled relatively easily. Fig. 21. shows schematically a wire holder with an etched Wollaston wire. The typical length of the etched p a r t is about 3 m m .
Field Ionization Mass Spectrometry. International Series of Monographs in Analytical Chemistry by Hans-D. Beckey, R. Belcher, H. Freiser