preformed ions
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scholarly journals Ion Yields for Some Salts in MALDI: Mechanism for the Gas-Phase Ion Formation from Preformed Ions

2011 ◽  
Vol 23 (1) ◽  
pp. 162-170 ◽  
Author(s):  
Jeong Hee Moon ◽  
Young Sik Shin ◽  
Yong Jin Bae ◽  
Myung Soo Kim
Keyword(s):  
Gas Phase ◽  
Ion Formation ◽  
Ion Yields ◽  
Maldi Mechanism ◽  
Gas Phase Ion ◽  
Preformed Ions

Cationization by Alkali Ion Attachment in Laser Desorption Mass Spectrometry

1982 ◽  
Vol 37 (1) ◽  
pp. 9-14 ◽  
Author(s):  
R. Stoll ◽  
F. W. Röllgen
Keyword(s):  
Gas Phase ◽  
Laser Desorption ◽  
Exchange Reactions ◽  
Organic Salts ◽  
Laser Desorption Mass Spectrometry ◽  
Desorption Mass Spectrometry ◽  
Mass Spec ◽  
Ion Attachment ◽  
Preformed Ions ◽  
Alkali Ion

Abstract The formation of quasimolecular ions by alkali ion attachment in laser desorption mass spec-trometry has been investigated by using a CW CO2 laser. For molecules such as sucrose the desorption of preformed ions could be excluded. Evidence is presented for the ionization by alkali ion attachment in the gas phase. Quasimolecular ions of organic salts were found to result from cationization reactions in the gas phase and from surface reactions. Very fast cation exchange reactions have been discovered for salts and acids impinging on alkali ion emitting surfaces.

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