This book is devoted to some of the major aspects of current research in the area of ion-ion and electron-ion collisions. Featured are the contributions of leading physicists from many countries. Individual papers address the following topics: electron-ion and proton-ion collisions in astrophysics, the role of atomic collisions in fusion, the theory of electron-atom collisions, potential energy curves for dissociative recombination, electron-impact excitation of ions, electron-impact ionization of ions, experimental studies of electron-ion recombination, the theory of low-energy ion-ion charge exchange, the measurement of inelastic ion-ion and electron-ion collisions, the measurement of ion(atom)-ion (atom) charge exchange, confinement of ions for collision studies, and ion-ion recombination using flowing afterglow plasmas.

Physics of ion-ion and electron-ion collisions. Vol. 83

This report discusses the process of dissociative reconsiderations. The particular topics covered are: Upper Limit to Rate Coefficient; Tunneling Dissociative Recombinations; and Signature of Polyatomic Ion Dissociative Recombination. 210 refs., 151 figs., 7 tabs.

Dissociative Recombination: Crossing and Tunneling Modes

Publisher Summary This chapter discusses electron–ion and ion–ion recombination processes. Recombination processes have historically been distinguished by the mechanism responsible for disposal of the excess energy of recombination via radiative decay, dissociation or collision with third bodies. When intermediate resonant states become involved, the processes are further distinguished either by the mechanism for production of an intermediate, collisionally delayed energy-resonant complex of superexcited states if it exists as in dielectronic recombination or by the mechanism subsequently responsible for stabilization of this complex as in dissociative recombination. The customary electronatomic ion dielectronic recombination and electron–molecular ion-direct dissociative recombination are then assigned as dielectronic-radiative and dielectronic-dissociative recombination, respectively, because electron capture initially occurs in both cases via resonant formation of a doubly excited atomic or molecular state, which is subsequently stabilized either by radiation or by dissociation. Collisions with third bodies not only can stabilize dielectronic recombination to give dielectronic-collisional recombination, but it can also enable dissociative recombination to yield collisional-dissociative recombination.

Electron-Ion and Ion Ion Recombination Processes

Two-photon transitions from the ground state of atomic xenon gas, $\mathrm{Xe}{(}^{1}{S}_{0}),$ to ${\mathrm{Xe}}^{\mathrm{*}}$ $\mathrm{nf}$ and $\mathrm{np}$ Rydberg states have been excited in an apparatus that combines ion time-of-flight and photoelectron detection capabilities. Evidence is presented that shows that xenon atoms excited to $\mathrm{nf}$ states with $n=4--8$ undergo rapid associative ionization with ground-state xenon atoms to form ${\mathrm{Xe}}_{2}^{+},$ while those excited to $\mathrm{np}$ states with $n=8--11$ do not. Subsequent ${\mathrm{Xe}}_{2}^{+}$ dissociative recombination (DR) favors exit channels where xenon atoms are formed predominately in $6p$ and $5d$ excited states. Comparisons with older optical studies suggest that photoelectron spectroscopy provides a simple but effective means of studying short-time (ns) DR dynamics.

Resonance-enhanced multiphoton-ionization–photoelectron study of the dissociative recombination and associative ionization of Xe 2 +

Final product states of Ne{sub 2}{sup +} dissociative recombination were studied using time-of-flight spectroscopy to determine the kinetic energies released. The dissociative recombination occurred in a sustained discharge in the presence of a variable magnetic field and discharge voltage, at pressures of 5{endash}15 mTorr. Under different conditions various excited states were observed ranging from the lowest 3s metastable states to higher Rydberg states within 0.00054 eV of the dissociation limit. From their narrow widths, it is deduced that these higher states arose from Ne{sub 2}{sup +} ions with subthermal energies. From two of these narrow distributions, we obtain an improved value for the dissociation limit D{sub 0}(Ne{sub 2}{sup +})=1.26{plus_minus}0.02eV. {copyright} {ital 1997} {ital The American Physical Society}

/pdf/dissociative-recombination-product-states-and-the-24n7nm5ef5.pdf

Dissociative-recombination product states and the dissociation energy D{sub 0} of Ne{sub 2}{sup +}

The paper deals with the optical investigation of the dissociative recombination of Ne
 2
 +
 molecular ions with electrons in the afterglow period of d.c. and high-frequency glow discharges. It has been confirmed experimentally that the dissociative recombination produces excited atoms in the Ne (3p
 i
 ) states and in the Ne (3d
 j
 states at room electron temperature. Then, the normalized partial recombination coefficients have been determined as 〈α(3d)〉=0·26 and t<α(3p)〉=0·74.

Population of the excited Ne atoms in 3d levels by dissociative recombination in the neon afterglow plasmas at room temperature

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Population of the excited Ne atoms in 3d levels by dissociative recombination in the neon afterglow plasmas at room temperature