Download Advances in Gas Phase Ion Chemistry, Volume 3 by N.G. Adams, L.M. Babcock PDF

By N.G. Adams, L.M. Babcock

Gas-phase ion chemistry is a huge box which has many functions and which encompasses a number of branches of chemistry and physics. An software that pulls jointly a lot of those branches is the synthesis of molecules in interstellar clouds. This was once a part of the incentive for experiences at the neutralization of ions via electrons and on isomerization in ion-neutral institutions. the result of investigations of specific features of ion dynamics are offered during this quantity. Solvation in ion-molecule reactions is mentioned and prolonged to incorporate multiply charged ions through the applying of electrospray thoughts. This quantity additionally offers a wealth of knowledge on response thermodynamics that is severe in settling on response spontaneity and availability of response channels. extra targeted experiences also are awarded in the direction of the top of this quantity, on the subject of the ionization technique and its nature.

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Dissociative Recombination Reactions Dissociative recombination reactions are thought to be the final step in the synthesis of polyatomic interstellar molecules via chains of ion-molecule reactions. Although these reactions are known to be rapid and dissociative, the branching fractions for the various possible neutral fragments have not been studied extensively. Since the recombination of ions and electrons yields an ionization potential worth of energy, many sets of exothermic products can exist, and these exothermic products can be formed in a wide variety of excited electronic, vibrational, and rotational states.

It is possible that electrons are not the major cartier of negative charge in dense interstellar clouds. It has been suggested that if a large fractional abundance of polycyclic aromatic hydrocarbons (PAHs) exists throughout dense interstellar clouds (see Section I), then electron sticking reactions of the type, PAH + e- ~ PAH- + hv (38) might lead to greater concentrations of PAH anions than of electrons. 85 Although such reactions are indeed expected on statistical grounds to be efficient for large neutrals with sizeable electron affinities, 86 it is not clear that the electron affinities of PAHs are large enough.

Since methanol is a fairly abundant interstellar molecule, and since we know of no other Ion-Molecule Chemistry in Space 23 plausible gas-phase synthesis, if the product channel CH3OH + H is not a major one, methanol may well be formed primarily on dust particles and desorbed by some unknown mechanism into the gas phase. Indeed, a sequence of hydrogenation reactions starting from CO and ending in methanol has been studied on cold laboratory surfaces. 82 As the size of the positive ion becomes very large, statistical considerations indicate that associative recombination via radiative emission should begin to dominate over dissociative channels.

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