Thermal desorption of quasimolecular ions

The thermal desorption of [M + Alkali] + quasimolecular ions from a heated metal surface is reported for some alkali salts of carboxylic acids and mixtures of alkali halides with a crown ether, glucose and adenosine. No quasimolecular ion could be detected from sucrose. With benzo[15]crown‐5 the desorption of [M + Na] + ions takes place even below the threshold temperature for thermionic emission of alkali ions. In addition, the desorption of intact [B(C 6 H 5 ) 4 ] − ions from a layer of NaB(C 6 H 5 ) 4 is reported.