2 edition of dissociation of 10 keV HeH+ molecular ions. found in the catalog.
dissociation of 10 keV HeH+ molecular ions.
Johannes Hendrikus Franciscus Maria Schopman
Written in English
|The Physical Object|
|Number of Pages||72|
Radiative Association: bond formation Timescales: s - vibrational transition, s - electronic transition, s - collisional timescale (or lifetime of collisional complex) => molecule formation only after ~ collisions ( if electronic transitions are available)! Slow for small reactants, but can be rapid for complex radicals. Normally, the hydronium ions produced from the first reaction suppress the dissociation of water to such an extent that the contribution of hydronium ions from the second equilibrium is negligible. Under these circumstances, one H 3 O + ion is formed for each A-ion, and we write.
energy interval kev. Previous papers from this Laboratory10"12 have described the apparatus used here for the determina-tion of atomic collision cross sections, and inasmuch as the same equipment served for the measurements of molecular ion dissociation, a detailed description will not be necessary. Suffice it to say that, as is customary. The reaction in which water breaks into hydrogen and hydroxide ions is a dissociation reaction. When a molecular compound undergoes dissociation into ions, the reaction can also be called ionization. H 2 O → H + + OH-When acids undergo dissociation, they produce hydrogen ions. For example, consider the ionization of hydrochloric acid.
the Ag + (aq) and Cl − (aq) ions become AgCl(s), but the Na + (aq) ions and the NO 3 − (aq) ions stay as Na + (aq) ions and NO 3 − (aq) ions. These two ions are examples of spectator ions, ions that do nothing in the overall course of a chemical reaction. They are present, but they do not participate in the overall chemistry. Collision-induced dissociation (CID), also known as collisionally activated dissociation (CAD), is a mass spectrometry technique to induce fragmentation of selected ions in the gas phase. The selected ions (typically molecular ions or protonated molecules) are usually accelerated by applying an electrical potential to increase the ion kinetic energy and then allowed to collide with neutral.
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The momentum distribution of the H+ dissociation fragments of 10 keV 'HeH+. See caption of fig. THE DISSOCIATION OF 10 keV HeH+ MOLECULAR IONS. IV the corl'esponding excess energies, ed, of the excited molecule above the dissociation limit are given in tables I and II. The dissociation of HeD+ has been investigated in the same by: The lowest pressure in the ion source is torr.
The mean time between two collisions is thus about s. While the lifetime of the 21P state is in the order of THE DISSOCIATION OF 10 keV (HeH)+ MOLECULAR IONS s, this state will give the Cited by: Book chapters Books Proceedings Theses Search.
Moutinho, Chemi-ionization in neutral-neutral collisions, Leiden University, Read more. F.W. Saris, Characteristic x-ray production F.W. Saris, Characteristic x-ray production by heavy ion-atom collisions.
Directional effects of the molecular ion reflection from a crystal surface. Surface Science Letters(), LL DOI: /(82) Peter Børgensen, Chen Hao-Ming, Hans Sørensen.
Stopping of 1–2 keV/amu hydrogen ions in solid by: Resolved beams of ions with energies between 10 and kev were passed through thin targets and the resulting beam analyzed as to momentum and energy. Equilibrium charge ratios were obtained for various ions after passing through thin films of Ni or organic polymer.
Cross sections for several reactions of oxygen ions with gas targets were also obtained. For gaseous targets, some of the Cited by: dissociation of 10 keV HeH+ molecular ions.
book The total and partial photodissociation cross sections of the molecular ion HeH+ are computed by time-dependent methods for fragmentation into the excited shells n=1,2,3 up to a photon energy of.
We have measured the intensity and polarizations of light emitted from atomic excited states of dissociated molecular ions. The dissociations are induced when fast molecular ions ( keV/amu) are transmitted through thin carbon foils.
A calculation of multiple scattering and the Coulomb explosion gives the average internuclear separation of the projectile at the foil surface. Molecular ions of the rare gases (He2+, Ne2+, A2+, Kr2+, and Xe2+) produced by electron impact at gas pressures from to mm Hg have been studied with a small mass spectrometer.
This paper reports on etch yield measurements on Au films by ion beams generated from Ar, Ne, O 2, N 2, CF 4, and C 2 F 6 in a Kaufman‐type ion gun for ion energies between and keV.
Ions and neutral species emanating from the gun are characterized by mass spectrometry. For CF 4 and C 2 F 6 the ion composition is a strong function of the magnetic field in the gun, CF + 3 being the.
Absolute cross sections have been measured for electron-impact dissociative excitation and ionization of the helium-hydride ion (HeH +) leading to the formation of helium ions He. Ion storage rings with an internal, merged electron beam target were used (10–12) to measure DR of molecular ions at electron temperatures that reached below 20 K.
These studies and related theoretical work (13 – 15) revealed the strong collision energy dependence of the cross section from predissociating molecular Rydberg states, formed. The technique of ion kinetic energy spectroscopy has been applied to a study of S +. formation from H 2 S +.
and O +. formation from H 2 O +ecular formation of S +. occurs by predissociation of the first excited state via the repulsive 4 A 2 state of H 2 S + the classical crossover region this reaction proceeds rapidly on the mass spectrometer time scale but tunneling through.
Many new phenomena have been found, especially concerning the dissociative recombination of molecular ions with electrons.1 The object of the present research is directed toward heavy molecular ions.
Dissociative recombination (DR) of molecular ions with electrons is a complex, poorly understood molecular process. Its critical role as a neutralising agent in the Earth's upper atmosphere is now well established and its occurrence in many natural and laboratory produced plasma has been a strong motivation for studying the event.
We have studied multiple ionization and dissociation of a trapped protonated peptide (leucine enkephalin) as induced by keV singly and doubly charged ions (H +, He +, 2+) to demonstrate the potential of keV ions as a future tool for peptide identification.
In contrast to conventional excitation techniques, the fragmentation pattern exhibits very strong peaks due to loss of sidechains in.
Cambridge Core - Atomic Physics, Molecular Physics and Chemical Physics - Dissociative Recombination of Molecular Ions - by Mats Larsson. The helium hydride ion or hydridohelium(1+) ion or helonium is a cation (positively charged ion) with chemical formula HeH +.It consists of a helium atom bonded to a hydrogen atom, with one electron removed.
It can also be viewed as protonated helium. It is the lightest heteronuclear ion, and is believed to be the first compound formed in the Universe after the Big Bang.
Absolute cross sections have been measured for electron-impact dissociative excitation and ionization of the helium-hydride ion (HeH+) leading to the formation of helium ions Heq+ (q = 1–2). Measurements have been performed for electron energies ranging from the respective thresholds up to keV.
Abstract. Dissociative electron capture has been studied in low — energetic collisions of multiply charged ions with simple diatomic molecules (H 2, D 2; E~(1*q) keV).The different possible capture reactions are separated with the aid of time-of-flight spectra, which are obtained by the coincident measurement of projectile and recoil ions.
The chapter includes an introduction to the main ionisation techniques in mass spectrometry and the way the resulting fragments can be analysed.
First, the fundamental notions of mass spectrometry are explained, so that the reader can easily cover this chapter (graphs, main pick, molecular ion, illogical pick, nitrogen rule, etc.).
Isotopic percentage and nominal mass calculation. The Dissociation of H+ The Dissociation of HeH+.- Discussion.- 5. Translational Spectroscopy.- Collisional Dissociation of keV N+2 Ions.- Collisional and Unimolecular Dissociation of keV HeH+ Ions.- Photodissociation of H+ 6. Concluding Remarks.- References.- 7 Collision-Induced Dissociation of Polyatomic.Dissociation, in chemistry, the breaking up of a compound into simpler constituents that are usually capable of recombining under other conditions.
In electrolytic, or ionic, dissociation, the addition of a solvent or of energy in the form of heat causes molecules or crystals of the substance to break up into ions (electrically charged particles).). Most dissociating substances produce ions by.Full text of "A bibliography on ion-molecule reactions, January to March Compiled by the Mass Spectrometric Data Center: F.
N. Harllee, H. M. Rosenstock, and J. T. Herron" See other formats TECHNICAL A Bibliography on Ion-Molecule Reactions January to March F. N. HARLLEE, H. M. ROSENSTOCK, AND J, T.
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