A unified statistical RRKM approach to the fragmentation and autoneutralization of metastable molecular negative ions of hexaazatrinaphthylenes

2020 ◽  
Vol 22 (5) ◽  
pp. 3073-3088 ◽  
Author(s):  
Rustem V. Khatymov ◽  
Pavel V. Shchukin ◽  
Mars V. Muftakhov ◽  
Igor K. Yakushchenko ◽  
Ol'ga V. Yarmolenko ◽  
...  
Keyword(s):  
Experimental Data ◽  
Negative Ions ◽  
Rrkm Theory

Experimental data on the formation and delayed decay of isolated negative ions are analyzed through the prism of statistical RRKM theory.

CHEMICAL BONDS DISSOCIATION ENERGY

2017 ◽  
Author(s):  
Adel Iakubov
Keyword(s):  
Experimental Data ◽  
Mass Spectrometry ◽  
Dissociation Energy ◽  
Yukawa Potential ◽  
Quantum Hall ◽  
Negative Ions ◽  
Fractional Quantum Hall Effect ◽  
Fractional Quantum ◽  
Fractional Quantum Hall ◽  
Charge Quantization

<p>In previous publications dealing with experimental mass spectrometry of tungsten hexacarbonyl, hexafluoroacetylacetone and its bidentate metal complexes M(hfac)<sub>2</sub>; M = Cu, Pd the obtained data have been not adequately systematized. In this paper, we analyze the previously published experimental data of the various bond dissociation energy.<b> </b>A modified Yukawa potential, which is the exact solution of the problem dependence the chemical bond energy of its length, is used to analyze the experimental data.<b> </b>Experimental results of the formation of ions can be interpreted only in terms of the formation of fractionally charged quasi-particles. <b> </b>As an experimental technique, mass spectrometry of negative ions in electron resonance capture mode ranks next to the fractional quantum Hall effect in which fractional values of the charge quantization are observed. Also noted the possibility capture of electron with “negative” kinetic energy.</p>

Unimolecular reactions, rates and quantum state distribution of products

1990 ◽  
Vol 332 (1625) ◽  
pp. 283-296 ◽  
Keyword(s):  
Experimental Data ◽  
Phase Space ◽  
Transition State ◽  
Quantum State ◽  
Space Theory ◽  
State Distribution ◽  
Unimolecular Reactions ◽  
Rrkm Theory ◽  
Vibrational Excitations ◽  
Phase Space Theory

Microcanonical rates and products rovibrational quantum state distributions of several unimolecular dissociations, and canonical rates of some bimolecular associations, are discussed from the viewpoint of variational Rice-Ramsperger-Kassel-Marcus (RRKM) theory. The results are compared with the experimental data and with the very useful benchmark theory, phase space theory. A two-transition-state description is discussed for the threshold regions for the products vibrational excitations.

CHEMICAL BONDS DISSOCIATION ENERGY

2017 ◽  
Author(s):  
Adel Iakubov
Keyword(s):  
Experimental Data ◽  
Mass Spectrometry ◽  
Dissociation Energy ◽  
Yukawa Potential ◽  
Quantum Hall ◽  
Negative Ions ◽  
Fractional Quantum Hall Effect ◽  
Fractional Quantum ◽  
Fractional Quantum Hall ◽  
Charge Quantization

<p>In previous publications dealing with experimental mass spectrometry of tungsten hexacarbonyl, hexafluoroacetylacetone and its bidentate metal complexes M(hfac)<sub>2</sub>; M = Cu, Pd the obtained data have been not adequately systematized. In this paper, we analyze the previously published experimental data of the various bond dissociation energy.<b> </b>A modified Yukawa potential, which is the exact solution of the problem dependence the chemical bond energy of its length, is used to analyze the experimental data.<b> </b>Experimental results of the formation of ions can be interpreted only in terms of the formation of fractionally charged quasi-particles. <b> </b>As an experimental technique, mass spectrometry of negative ions in electron resonance capture mode ranks next to the fractional quantum Hall effect in which fractional values of the charge quantization are observed. Also noted the possibility capture of electron with “negative” kinetic energy.</p>

scholarly journals The mobility of ions in pure gases

1930 ◽  
Vol 129 (809) ◽  
pp. 162-180 ◽  
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
Water Vapour ◽  
Negative Ions ◽  
Dynamical Theory ◽  
Positive Ions ◽  
Mobility Of Ions ◽  
Observational Errors ◽  
Gas Tight

Although determination of the mobility of ions in gases have been made Almost continuously during the last 30 years, the nature of the ions still remains obscure. The values obtained by different experiments, using a variety of methods, differ by amounts far in excess of those to be attributed to be observational errors and some methods yield results which are complicated and difficult to explain on any simple theory of the nature of the ion. The main facts which have emerged from the mass of experimental data are summarised in “Conduction of Electricity through Gases.”* It seems probable that in none of the experiments made hitherto has the gas under examination been spectroscopically pure. In many cases materials such as ebonite and sulphur have been in contact with the gas. In others the apparatus has been made gas-tight by means of waxed flanges or greased joints. In such conditions the purity of the gas leaves much to be desired. It is continually being contamined by impurities such as water vapour and carbon dioxide coming from the walls of the vessels and from the metals parts of the apparatus as well as by the vapours from the wax, ebonite, etc. Such impurities may have large affinities for electron and may unite with the positive ions to form groups. In such conditions, in a given gas, the ions may well consist of clusters of which the size and mass vary from one experiment to another. The reason why many observers have found the negative ions to be of molecular magnitude and not electrons in nitrogen, hydrogen, etc., becomes Obvious, and it is not surprising that the actual mobilities found are smaller than those calculated theoretically from the standpoint of the classical dynamical theory of gases, assuming the ions to be monomolecular. The present writers for example, found that in an experiments on nitrogen at a pressure of 600 mm, freshly introduced into an apparatus contained under a bell jar, the negative carries consisted of a mixture of ions and electrons. The effect of the contamination coming from the walls was clearly shown by the fact that the number of “normal” ions increased, and of electrons decreased, on leaving the gas in the apparatus overnight.

MASS SPECTROMETRIC ANALYSIS OF SOME HYDROGEN OXIDES. I

1958 ◽  
Vol 36 (2) ◽  
pp. 184-191 ◽  
Author(s):  
Larkin Kerwin ◽  
Maurice Cottin
Keyword(s):  
Experimental Data ◽  
Negative Ions ◽  
Mass Spectrometric ◽  
Mass Spectrometric Analysis ◽  
Spectrometric Analysis

Typical mass spectrograms for H2O, D2O, H2O2, and D2O2 are presented. Both positive and negative ions were observed. The variations of the abundances of the spectrogram components with pressure are given. Some features of the experimental data are discussed.

Microdiffraction Patterns of Small Metallic Particles II; Theoretical Analysis

1982 ◽  
Vol 40 ◽  
pp. 668-669
Author(s):  
A. Gómez ◽  
P. Schabes-Retchkiman ◽  
M. José-Yacamán ◽  
T. Ocaña
Keyword(s):  
Experimental Data ◽  
Electron Diffraction ◽  
Theoretical Analysis ◽  
Size Range ◽  
Dynamical Theory ◽  
Metallic Particles ◽  
Splitting Effect

The splitting effect that is observed in microdiffraction pat-terns of small metallic particles in the size range 50-500 Å can be understood using the dynamical theory of electron diffraction for the case of a crystal containing a finite wedge. For the experimental data we refer to part I of this work in these proceedings.

Evidence for ordered Fe3Ni

1987 ◽  
Vol 45 ◽  
pp. 216-217
Author(s):  
K.B. Reuter ◽  
D.B. Williams ◽  
J.I. Goldstein
Keyword(s):  
Experimental Data ◽  
Martensitic Transformation ◽  
Electron Diffraction ◽  
Room Temperature ◽  
Direct Evidence ◽  
Transformation Product ◽  
Iron Meteorites ◽  
X Ray ◽  
Ni Content ◽  
Temperature Transformation

In the Fe-Ni system, although ordered FeNi and ordered Ni3Fe are experimentally well established, direct evidence for ordered Fe3Ni is unconvincing. Little experimental data for Fe3Ni exists because diffusion is sluggish at temperatures below 400°C and because alloys containing less than 29 wt% Ni undergo a martensitic transformation at room temperature. Fe-Ni phases in iron meteorites were examined in this study because iron meteorites have cooled at slow rates of about 10°C/106 years, allowing phase transformations below 400°C to occur. One low temperature transformation product, called clear taenite 2 (CT2), was of particular interest because it contains less than 30 wtZ Ni and is not martensitic. Because CT2 is only a few microns in size, the structure and Ni content were determined through electron diffraction and x-ray microanalysis. A Philips EM400T operated at 120 kV, equipped with a Tracor Northern 2000 multichannel analyzer, was used.

EELS white line intensities calculated for the 3d and 4d metals

1989 ◽  
Vol 47 ◽  
pp. 388-389
Author(s):  
C. C. Ahn ◽  
D. H. Pearson ◽  
P. Rez ◽  
B. Fultz
Keyword(s):  
Experimental Data ◽  
Line Intensity ◽  
Transition Probabilities ◽  
Initial Increase ◽  
White Line ◽  
Hartree Fock ◽  
Line Intensities ◽  
Integrated Intensity ◽  
X Ray Absorption ◽  
The Continuum

Previous experimental measurements of the total white line intensities from L2,3 energy loss spectra of 3d transition metals reported a linear dependence of the white line intensity on 3d occupancy. These results are inconsistent, however, with behavior inferred from relativistic one electron Dirac-Fock calculations, which show an initial increase followed by a decrease of total white line intensity across the 3d series. This inconsistency with experimental data is especially puzzling in light of work by Thole, et al., which successfully calculates x-ray absorption spectra of the lanthanide M4,5 white lines by employing a less rigorous Hartree-Fock calculation with relativistic corrections based on the work of Cowan. When restricted to transitions allowed by dipole selection rules, the calculated spectra of the lanthanide M4,5 white lines show a decreasing intensity as a function of Z that was consistent with the available experimental data.Here we report the results of Dirac-Fock calculations of the L2,3 white lines of the 3d and 4d elements, and compare the results to the experimental work of Pearson et al. In a previous study, similar calculations helped to account for the non-statistical behavior of L3/L2 ratios of the 3d metals. We assumed that all metals had a single 4s electron. Because these calculations provide absolute transition probabilities, to compare the calculated white line intensities to the experimental data, we normalized the calculated intensities to the intensity of the continuum above the L3 edges. The continuum intensity was obtained by Hartree-Slater calculations, and the normalization factor for the white line intensities was the integrated intensity in an energy window of fixed width and position above the L3 edge of each element.

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