ISSN:
0951-4198
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
Al+, Cr+ and Cu+ gas-phase ions have found to attach effciently to two polymers, polystyrene and polyethylene glycol (PEG) in laser-desorption time-of-flight experiment, and are shown to be viable alternatives to be commonly used Na+, K+ and Ag+ ions. At high laser powers, in the range 8.0 × 107 to 2.0 × 108 W/cm2, ions can be attached by desorption from a support made of the apporoptite meal. An alternative method is to add the metal ion in the form of a salt containing the metal in the +1 oxidation state, when such salt are available. This method requires lowe laser powers, in the range 2.0 × 107 to 8.0 × 107 W/cm2. The two desorption/attachment methods are characterized by different optiomal time-delay values for recording of spectra. Polystyrence has been found to have a hight affinity for attachemnt to Al+, Cr+, and Cu+ than to K+, while PEG has ben found to have a hight affinity for K+ than for Al+, Cr+. These preferential attachments are discussed in terms of the hard and soft acids and bases principle.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/rcm.1290060906
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