ChemInform Abstract: ENERGY PARTITIONING IN UNIMOLECULAR DECOMPOSITION. ISOTOPE EFFECTS ON THE KINETIC ENERGY RELEASE IN THE LOSS OF HYDROGEN FROM (CH2-OH)+

1978 ◽  
Vol 9 (33) ◽  
Author(s):  
G. J. RICKARD ◽  
N. W. COLE ◽  
J. R. CHRISTIE ◽  
P. J. DERRICK
Keyword(s):  
Kinetic Energy ◽  
Energy Release ◽  
Isotope Effects ◽  
Kinetic Energy Release ◽  
Energy Partitioning ◽  
Unimolecular Decomposition

Isotope effects on kinetic energy release. Elimination of CH4 from [CH3CHOH]+ and [CH2OCH3]+

1989 ◽  
Vol 93 (2) ◽  
pp. 215-223 ◽  
Author(s):  
Kevin F. Donchi ◽  
Einar Uggerud ◽  
Georg Hvistendahl ◽  
Peter J. Derrick
Keyword(s):  
Kinetic Energy ◽  
Energy Release ◽  
Isotope Effects ◽  
Kinetic Energy Release

Kinetic Energy Release and Energy Partitioning During the Ionic Fragmentation in Metastable Ions

1983 ◽  
Vol 38 (5) ◽  
pp. 524-527
Author(s):  
F. H. Abd El-Kader ◽  
M. S. Abd El-Fattah
Keyword(s):  
Kinetic Energy ◽  
Temperature Dependence ◽  
Kinetic Energy Release ◽  
Molecular Ions ◽  
Energy Partitioning ◽  
Unimolecular Decomposition ◽  
Centrifugal Barrier ◽  
Metastable Ions ◽  
Significant Temperature ◽  
Ionic Fragmentation

The kinetic energy released in the unimolecular decomposition of some metastable transitions has been investigated. It was found to have a significant temperature dependence in cases of H‘ loss from molecular ions. This is attributed to the tunelling of H• atom through the centrifugal barrier.The activation energies of the reverse reactions “εr≠” and the kinetic energy released “TB” have been determined for the loss of H• from acetonitrile and elimination of HCN from benzonitrile. The partitioning energy quotients q=TB/εr≠ are found = 0.91 and 0.58 for acetonitrile and benzonitrile respectively.

The mass and ion kinetic energy spectra of H 2 , HD and D 2

1972 ◽  
Vol 327 (1568) ◽  
pp. 1-11 ◽  
Keyword(s):  
Fine Structure ◽  
Kinetic Energy ◽  
Energy Release ◽  
Isotope Effects ◽  
Kinetic Energy Release ◽  
Energy Spectra ◽  
Vibrational States ◽  
First Excited State ◽  
Ion Kinetic Energy ◽  
Double Focusing

The collision-induced reactions, (1) H +· 2 → H + + H · , (2) H + 3 → H + + H 2 , and (3) H + 3 → H +· 2 + H · , and the corresponding reactions of the deuterated species, have been examined for their kinetic energy release using a double focusing mass spectrometer. Reaction (1) encompasses two discrete processes, the first apparently involving only the ground electronic state of H + 2 and the second apparently occurring via excitation to the repulsive first excited state. Isotope effects on the kinetic energy release associated with the transition to the repulsive state in process (1) are consistent with the proposed mechanism. Process (2) gives a ‘meta- ­ stable peak’ which shows fine structure, possibly due to individual vibrational states of H 2 . Reaction (3) occurs by electronic transition to a repulsive state(s).

Kinetic Energy Release and Position of the Transition State for С6Н7+ Ions Produced from Isomeric C7H8O Precursors

1991 ◽  
Vol 46 (12) ◽  
pp. 1021-1025 ◽  
Author(s):  
Ezzat T. M. Selim ◽  
M. A. Rabbih ◽  
M. A. Fahmey
Keyword(s):  
Kinetic Energy ◽  
Transition State ◽  
Energy Release ◽  
Benzyl Alcohol ◽  
Kinetic Energy Release ◽  
Heat Of Formation ◽  
Molecular Ions ◽  
Energy Partitioning ◽  
Endothermic Reaction ◽  
Late Transition

Abstract The energetic requirement and mechanisms for CHO' loss from the molecular ions of isomeric C7H8O precursors have been reported. The heat of formation of [C6H7]+ (protonated benzene) was determined and ε* evaluated. Measurement of the kinetic energy release TB gives the energy-partitioning quotients q= TB/εr* which range from 0.38 to 0.99. The energy available and TB are small for the strongly endothermic reaction of benzyl alcohol but increase sharply in the case of the weakly endothermic reaction of anisole. All reactions have "late" transition states, the position X0*of the transition state on the reaction coordinate varying from 0.64 to 0.93

Electron impact studies. CXXI. Release of kinetic energy during negative-ion fragmentations. The loss of NO+ from substituted nitrobenzene molecular anions

1978 ◽  
Vol 31 (3) ◽  
pp. 573 ◽  
Author(s):  
JH Bowie ◽  
T Blumenthal ◽  
PY White
Keyword(s):  
Kinetic Energy ◽  
Energy Release ◽  
Electron Impact ◽  
Kinetic Energy Release ◽  
Negative Ion ◽  
Unimolecular Decomposition ◽  
Impact Studies ◽  
Nitrobenzoic Acid ◽  
Molecular Anions ◽  
T Values

Kinetic energy release values [T(50%) values] between 0.05 and 0.8 eV have been noted for the unimolecular decomposition M- → (M-NO.)- of the molecular anions of variously substituted nitrobenzenes. Large T values are observed when the substituent is strongly electron-withdrawing. Composite peaks are obtained for m-nitrobenzoic acid and m-nitroacetophenone, showing the occurrence of two distinct processes in these cases.

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