Unique Home Furniture, Home Decorating and Home Decoration Store
Equiv-ilent To Negative Ions: When gammas interact with matter, they eject :lectrons and it is these free fast electrons (equiv-ilent to negative ions) together with ions which hey produce which are detected and measured.
Once ionization has occurred, various methods ire in use for recognizing and evaluating it; imong these are voltage change, current flow 'pulse or change), condensation (around ionized luclei), crystal conduction, and photographic nethods. Two of the most important radiation letecting instruments are the ionization chamber and the Geiger-Muller (G-M) counter.
Several reports of research, which were published during the year, described continuing progress in the preparation of stable car-bonium ions, with the controversy over the existence of nonclassical carbonium ions still largely unresolved. Carbonium ions are organic ions with a positively charged carbon atom. In one of the most interesting of these papers, G. A. Olah and co-workers used fluosulfonic acid and antimony pentafluoride in liquid sulfur dioxide as a strongly acid medium.
Using this reagent, they formed stable carbonium ions from alcohols and carbonyl compounds; the fluosulfonic acid also formed carbonium ions from saturated hydrocarbons and ion derivatives (9) from esters. Treatment of various halogenated compounds with a similar reagent produced bridged halonium (organic ion with positively charged halogen) ions (10), acyloxonium (positively charged carboxyl group) ions (11), and arylonium (positively charged phenyl group) ions (12).
An unsubstituted cyclopropenium salt was isolated by R. Breslow, J. T. Groves, and G. Ryan, starting with a related halogen com
pound. Such compounds are based on cyclo propene: |
|
