Gaseous Carbonium Ions from the Decay of Tritiated Molecules

Reaction of oxygen(3P) atoms with toluene and 1-methylcyclohexene

“…1 -Methyl-1,2-epoxycyclohexane may be formed from either of the initially formed biradicals A or B by ring closure, while 2-methylcyclohexanone may be formed from A by a 1,2 H atom shift or from B by 1,2 methyl migration. 1,2 ring contraction leads to 1-methylcyclopentenecarboxaldehyde and methyl cyclopentyl ketone from A and B, respectively, probably via Plot of selected product yields (N2 = 1) against total N20 pressure for the reaction of 0(3P) atoms with 1 -methylcyclohexene at Fragmentation, such as to CO, of the vibrationally or electronically excited products formed will be more important at low pressures in the absence of stabilizing collisions, and hence the addition product yields will increase with pressure while the fragmentation product yields will decrease, as observed.…”

Chemical Effects of Tritium Decay in Aqueous Solution of Uracil

“…Nevertheless, the present observations can be rationalized in the foUowing fashion. When the tritium decays in the C(5) Position of uracil, the helium departs as a neutral atom [20], leaving a radical excited and with a positive Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 7/26/15 3:56 PM Charge localized primaiüy on the C(5) = C(6) bond (I).…”

Ion-Molecule Reactions Following β-decay of Tritiated Cyclobutane and Cyclopentane

“…However, as shown by the double-resonance observations (Table 1), the tritiated C4H7+ species are also formed by hydride and tritide transfer to the C4H7+-like primary ions, and so the observed yields of these species represent a combination of ions formed as a result of the beta decay and secondary product ions. The formation of gaseous carbonium ions by this nuclear process has been a convenient technique by which their properties and reactions may be studied, and CACACE [5,7] has exploited this approach in an extensive series of investigations. Each molecule studied was at least double-labelled with tritium, so that after beta decay of one tritium, the others permit tracing the fate of the daughter species.…”

“…on the properties of recoil species at the moment they are created by the decay or reaction [1,2]. There is also a vast body of knowledge on the chemistry of "hot atoms" at the moment they react with substrate molecules and thereby become stabilized in chemical combination [3][4][5]. However, the recoil species may undergo numerous collisions with neighboring molecules between its birth and the collision in which it reacts chemically to form a stable observable product, and consequently the species that finally reacts may bear little resemblance to the initial recoil.…”