Nascent product vibrational state distributions of ion–molecule reactions: The proton transfer reactions F−+HX→HF(v)+X−, X = Cl, Br, and I

1981 ◽  
Vol 75 (10) ◽  
pp. 4873-4884 ◽  
Author(s):  
James C. Weisshaar ◽  
Timothy S. Zwier ◽  
Stephen R. Leone
Keyword(s):  
Proton Transfer ◽  
Vibrational State ◽  
Transfer Reactions ◽  
Ion Molecule Reactions ◽  
Proton Transfer Reactions

Field Induced Ion Molecule Reactions in Adsorbed Layers Studied by Pulsed Field Desorption

1974 ◽  
Vol 29 (2) ◽  
pp. 230-238 ◽  
Author(s):  
F. W. Röllgen ◽  
H. D. Beckey
Keyword(s):  
Proton Transfer ◽  
Ionization Potential ◽  
Chemical Interaction ◽  
Transition Probability ◽  
Transfer Reactions ◽  
Field Desorption ◽  
Pulsed Field ◽  
Ion Molecule Reactions ◽  
Adsorbed Layers ◽  
Proton Transfer Reactions

The formation of ions under field ionization conditions is partly due to ion molecule reactions in adsorbed layers on the emitter surface. In order to study these reactions a pulsed field desorption (PFD) technique was applied, by which ions resulting from these reactions are detected with high relative intensity. The PFD-mass spectra of some small organic molecules are discussed with respect to the principal reaction mechanisms and types of ions formed. It was found that if reactions involving chemical interaction with the surface are left out of consideration only proton transfer reactions are the primary processes. Desorption products resulting from proton transfer reactions are, for example, (M+H)+, (2M+H)+, (3M+H)+, (M+CH3)+ and (2M)+ ions in the case of methanol. The formation of complexes preceeding atom rearrangement reactions are suppressed by the high electric field and consequently could not be detected. Secondary reactions of the (M-H)•-radical lead to the elimination of H- from molecules and in certain cases to the formation of addition complexes. Field induced reactions were found to occur almost adiabatically, i.e. it is not necessary to supply the ionization potential of the proton donor in a proton transfer reaction. Products of reactions with ionization energies above the ionization potential of the molecules involved in the reaction are not observable. To a first approximation the electron transition probability for field reactions seems to be dependent on the energy of formation of the ions and not on the type of reaction.

Ion-molecule reactions of formic acid. I. Proton-transfer reactions

1978 ◽  
Vol 31 (10) ◽  
pp. 2157 ◽  
Author(s):  
CG Freeman ◽  
PW Harland ◽  
MJ McEwan
Keyword(s):  
Proton Transfer ◽  
Formic Acid ◽  
General Equation ◽  
Reasonable Agreement ◽  
Transfer Reactions ◽  
Rate Coefficients ◽  
Collision Rate ◽  
Dipole Orientation ◽  
Ion Molecule Reactions ◽  
Proton Transfer Reactions

Rate coefficients are reported for a number of proton-transfer reactions with formic acid. These reactions can be represented by the general equation �������������������������� XH++HCOOH → (HCOOH)H+ +X : (X = CH4, H2O, N2, CO, HCN, HCHO, CH3OH and H2S). Reasonable agreement was obtained between our observed results and predictions based on the average-dipole-orientation (ADO) model except that ADO theory may slightly underestimate the collision rate.

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