HgCl B2Σ+1/2 formation by low-energy electron impact dissociation of HgCl2 and(or) CH3HgCl molecules: applications to HgCl (B → X) laser

1990 ◽  
Vol 68 (2) ◽  
pp. 166-169 ◽  
Author(s):  
Mohammad F. Mahmood
Keyword(s):  
Energy Range ◽  
Electron Energy ◽  
Cross Sections ◽  
Band System ◽  
Low Energy ◽  
Dissociative Excitation ◽  
Intense Band ◽  
Electron Impact Dissociation ◽  
Low Energy Electrons ◽  
Low Energy Electron

An investigation was made of the process of dissociative excitation of a HgCl radical in the B2Σ+1/2 state due to collisions of low-energy electrons with HgCl2 and CH3HgCl molecules. Using the most intense band of the B2Σ+1/2 – X2Σ+1/2 system of the HgCl radical at 557 nm that corresponds to the ν′ = 0 to ν″ = 22 transition, emission cross sections were measured in the electron energy range 1–100 eV. The threshold electron energy for the observation of the B2Σ+1/2 – X2Σ+1/2 band system has been determined to be 7.0 and 8.0 eV for HgCl2 and CH3HgCl molecules, respectively.

scholarly journals Laser action on the (B–X) band of HgI at 445 nm

1991 ◽  
Vol 9 (4) ◽  
pp. 781-785
Author(s):  
Mohammad F. Mahmood
Keyword(s):  
Kinetic Energy ◽  
Energy Range ◽  
Cross Sections ◽  
Band System ◽  
Laser Action ◽  
Dissociative Excitation ◽  
Intense Band ◽  
X Band ◽  
Integrated Intensity ◽  
Atomic Mercury

Dissociative excitation of the HgI (B–X) band system and atomic mercury lines was observed during collisions of CO+ ions with CH3HgI molecules in the laboratory kinetic energy range 100–1000 eV. By the use of the integrated intensity of the most intense band of the (B–X) transition of the HgI radical at 445 nm, emission cross sections were measured at different kinetic energies of these ions.

Pseudopotential calculations of elastic scattering of low-energy electrons (< 20 eV) from neon atoms

1992 ◽  
Vol 70 (5) ◽  
pp. 305-310 ◽  
Author(s):  
Y. Frongillo ◽  
B. Plenkiewicz ◽  
P. Plenkiewicz ◽  
J.-P. Jay-Gerin
Keyword(s):  
Elastic Scattering ◽  
Energy Range ◽  
Cross Sections ◽  
Impact Energy ◽  
Theoretical Data ◽  
Low Energy ◽  
Pseudopotential Calculations ◽  
Low Energy Electrons ◽  
The Impact ◽  
Good Agreement

Pseudopotential calculations of phase shifts, differential, total, and momentum-transfer cross sections for electrons elastically scattered from neon atoms are reported in the impact energy range 0–20 eV. The results are found to be in very good agreement with existing experimental and other theoretical data.

scholarly journals Взаимодействие низкоэнергетических электронов с молекулами D-рибозы

2021 ◽  
Vol 129 (12) ◽  
pp. 1471
Author(s):  
И.В. Чернышова ◽  
Е.Э. Контрош ◽  
О.Б. Шпеник
Keyword(s):  
Total Cross Section ◽  
Energy Range ◽  
Cross Section ◽  
Electron Scattering ◽  
Cross Sections ◽  
Electron Attachment ◽  
Low Energy ◽  
Dissociative Electron Attachment ◽  
Low Energy Electrons ◽  
First Time

Abstract– The interactions of low-energy electrons (<20 eV) with D-ribose molecules, namely, electron scattering and dissociative attachment, are studied. The results of these studies showed that the fragmentation of D-ribose molecules occurs effectively even at an electron energy close to zero. as well as in the energy range 5.50–9.50 eV. In the total cross section of electron scattering by molecules, resonance features at energies of 5.00–9.00 eV in the region of formation of ionic fragments C3H4O2–, C2H3O2–, OH–, associated with the destruction of molecular heterocycles, were experimentally discovered for the first time. The correlation of the features observed in the scattering and dissociative electron attachment cross sections is analyzed.

scholarly journals Elastic scattering of low-energy electrons by OCS molecules.

2000 ◽  
Vol 53 (3) ◽  
pp. 399 ◽  
Author(s):  
M. H. F. Bettega ◽  
M. A. P. Lima ◽  
L. G. Ferreira
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Electron Scattering ◽  
Cross Sections ◽  
Ab Initio Calculation ◽  
Low Energy ◽  
Low Energy Electrons ◽  
Exchange Approximation ◽  
Low Energy Electron ◽  
Theoretical Results

We report results from an ab initio calculation of low-energy electron scattering by OCS molecules. We used the Schwinger multichannel method with pseudopotentials at the fixed-nuclei static-exchange approximation to calculate elastic integral, differential and momentum transfer cross sections in the energy range from 5 to 50 eV. We compare our results with available theoretical results and experimental data. Through the symmetry decomposition of our integral cross section and eigenphase sum analysis, we found structures in the cross sections that may be interpreted as shape resonances for ∑, ∏ and Δ symmetries. We compared the results for OCS with our previous results on the e––CS2 collision. In particular, we found a similar behaviour in the shape of the symmetry decomposed cross sections of OCS and of CS2 when, for the latter, we sum over the ‘g’ and ‘u’ contributions.

scholarly journals Low-energy electron driven processes in ices: Synthesis reactions and surface functionalization

2008 ◽  
Vol 6 (1) ◽  
pp. 89-98
Author(s):  
I. Martin ◽  
L. Amiaud ◽  
R. Azria ◽  
A. Lafosse
Keyword(s):  
Electron Energy ◽  
Electron Attachment ◽  
Low Energy ◽  
Energy Electron ◽  
Molecular Anions ◽  
Resolution Electron ◽  
Decarboxylation Reaction ◽  
Low Energy Electrons ◽  
Low Energy Electron ◽  
Substrate Surfaces

Low-energy electrons, and subexcitation energy electrons in particular, have the ability to induce efficiently chemical modifications within condensed molecular films and at substrate surfaces. By taking advantage of the Dissociative Electron Attachment (DEA) process, which leads to selective bond cleavages, the induced reactivity can be controlled solely by the electron energy. Two illustrative examples of induced reactivity and substrate functionalization achieved by low-energy electron processing of condensed molecules studied by means of High Resolution Electron Energy Loss Spectroscopy (HREELS) are reviewed, and special interest is given to the possibility of proposing overall reaction mechanisms. The resonant decarboxylation reaction in condensed films of trifluoroacetic acid CF3COOH induced by electrons at ~1 eV involves the formation of the transient species [CF3COOH]#- and the further formation of CO2 by a concerted mechanism. Diamond substrate functionalization by CH2CN organic groups through Cdiam-C and Cdiam-N bonds is performed by 2 eV electron irradiation of condensed acetonitrile CH3CN and involves reactants formed by DEA, that are neutral radicals H? and molecular anions [H2CCN]-.

Low energy (6–18 eV) electron scattering from condensed thymidine (dT) III: absolute electronic excitation cross sections

2020 ◽  
Vol 22 (16) ◽  
pp. 8364-8372
Author(s):  
V. Lemelin ◽  
A. D. Bass ◽  
L. Sanche
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Cross Sections ◽  
Electronic Excitation ◽  
Low Energy ◽  
Resolution Electron ◽  
Excitation Cross Sections ◽  
Low Energy Electron ◽  
First Time ◽  
Electron Energy Loss

We report for the first time the low-energy electron energy loss spectrum for electronic excitation of condensed thymidine measured by high resolution electron energy loss spectroscopy.

Light Emission in the VUV by Dissociative Excitation of CH4 with Low-Energy Electrons

1969 ◽  
Vol 24 (11) ◽  
pp. 1724-1727 ◽  
Author(s):  
W. Sroka
Keyword(s):  
Free Radical ◽  
Cross Section ◽  
Cross Sections ◽  
Light Emission ◽  
Excitation Cross Section ◽  
Low Energy ◽  
Dissociative Excitation ◽  
Single Collision ◽  
Excited Atoms ◽  
Low Energy Electrons

By bombardment of methane with low-energy electrons (0 - 400 eV) the molecule is dissociated in a single collision into excited C and H atoms or into excited H atoms and a free radical. The excited atoms emit a radiation in the vuv (900 Å -1700 Å). The appearance potentials and excitation functions are measured. Approximate values of the cross sections are given. The excitation cross section for the CII-Lines are extremely small (σ ≦ 10-21 cm2), whereas those for the H and CI-lines are of the order of 10-19-10-18 cm2 at 150 eV.

scholarly journals Charmed and bottomed hadronic cross sections from a statistical model

2020 ◽  
Vol 56 (9) ◽  
Author(s):  
Gábor Balassa ◽  
György Wolf
Keyword(s):  
Statistical Model ◽  
Energy Range ◽  
Cross Sections ◽  
Heavy Quarks ◽  
Open Charm ◽  
Low Energy ◽  
Final State ◽  
Proton Antiproton ◽  
Proton Proton

Abstract In this work, we extended our statistical model with charmed and bottomed hadrons, and fit the quark creational probabilities for the heavy quarks, using low energy inclusive charmonium and bottomonium data. With the finalized fit for all the relevant types of quarks (up, down, strange, charm, bottom) at the energy range from a few GeV up to a few tens of GeV’s, the model is now considered complete. Some examples are also given for proton–proton, pion–proton, and proton–antiproton collisions with charmonium, bottomonium, and open charm hadrons in the final state.

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