Quantitative Messung des Elektronenaffinitätskontinuums von Chlor mit dem Stoßwellenrohr / Quantitative Measurement Of The Electron Affinity Continuum Of Chlorine With The Shock Tube

1972 ◽  
Vol 27 (6) ◽  
pp. 989-995 ◽  
Author(s):  
G. Pletsch
Keyword(s):  
Shock Tube ◽  
Cross Section ◽  
Electron Affinity ◽  
Quantitative Measurement ◽  
Wavelength Region ◽  
Electron Attachment ◽  
Absolute Intensity ◽  
Intensity Measurements ◽  
Long Wave ◽  
Chlorine Ion

Abstract Using a mixture of chlorine with krypton the continuous spectrum resulting from electron attachment to chlorine atoms is produced in a shock tube. Absolute intensity measurements lead to the detachment cross-section of the negative chlorine ion in the wavelength region between the long-wave threshold at 3434 Å and 2700 Å. The cross-section is compared with known experimental and theoretical values.

scholarly journals Quantitative Ausmessung des Brom-Affinitätskontinuums und Bestimmung der Detachment-und Attachment-Querschnitte

1970 ◽  
Vol 25 (11) ◽  
pp. 1617-1626 ◽  
Author(s):  
H. Frank ◽  
M. Neiger ◽  
H.-P. Popp
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Electron Affinity ◽  
Elastic Cross Section ◽  
Electron Atom ◽  
Intensity Measurements ◽  
Long Wave ◽  
The Mean ◽  
Intense Electron

Abstract A wall stabilized low-current cylindric arc was used to produce the radiation of the negative Bromine-ions. The radiation consists of an affinity-continuum with a long-wave threshold of 3682 Å, yielding an electron affinity for Bromine of 3.366 eV, and of an intense electron-atom Bremsstrahlung in the visible. Intensity measurements of the continua allow the determination of the photo-detachment-and attachment-cross-sections of Bromine and also the determination of the mean elastic cross-section of electrons against Bromine atoms.

Autoionization resonances and configuration-mixing in the emission spectra of Zn I and Cd I

1972 ◽  
Vol 331 (1585) ◽  
pp. 237-247 ◽  
Keyword(s):  
Cross Section ◽  
Capture Cross Section ◽  
Emission Spectra ◽  
Absolute Intensity ◽  
Ionization Probability ◽  
Capture Cross ◽  
Photometric Study ◽  
Intensity Measurements ◽  
Mixing Coefficients ◽  
Configuration Mixing

From new emission spectra of Cd I and Zn I the nsnp 1 P 0 -np 2 3 P 2 features have been identified in each case ( n = 4 for Zn and n = 5 for Cd). Absolute photometric study of the resonances has proved that they have the same half-widths as their shorter-wavelength companions nsnp 3 P 0 -np 2 3 P 2 . The measured auto-ionization probability for the Cd I 5p 2 3 P 2 level is 4.15 x 10 13 s -1 and for the Zn I 4p 2 3 P 2 level is 4.84 x 10 12 s -1 . From the absolute intensity measurements we have determined the configuration-mixing coefficients and, for Cd I, the capture cross-section for the 5sE(d) 1 D 2 continuum associated with the resonance at 310.7 nm.

Quantitative Ausmessung des Chlor-Affinitätskontinuums

1968 ◽  
Vol 23 (8) ◽  
pp. 1213-1220 ◽  
Author(s):  
Günther Mück ◽  
Hanns-Peter Popp
Keyword(s):  
Absorption Coefficient ◽  
Cross Section ◽  
Photon Energy ◽  
Thermodynamic Equilibrium ◽  
Electron Affinity ◽  
Temperature Measurements ◽  
Linear Extrapolation ◽  
Chlorine Ion ◽  
Kirchhoff's Law

The radiation emitted from the axis of a low current cylindric arc in chlorine was quantitatively recorded. In the UV-region appears the affinity-continuum of chlorine which begins at a longwave threshold of 3428 A yielding an electron-affinity for Cl of 3.616 eV. With spectroscopic temperature measurements and by means of Kirchhoff’s law, the absorption coefficient of the affinitycontinuum is obtained after separation from the background with a linear extrapolation. Thereby the detachment cross section of the negative chlorine-ion is calculated as a function of photon energy. Deviations from thermodynamic equilibrium are accounted for.

A Multi-Layer Approach to the Equation of Motion Coupled-Cluster Method for the Electron Affinity

2020 ◽  
Author(s):  
Soumi Haldar ◽  
Achintya Kumar Dutta
Keyword(s):  
Electron Affinity ◽  
Electron Attachment ◽  
Equation Of Motion ◽  
Cluster Method ◽  
Coupled Cluster ◽  
Coupled Cluster Method ◽  
Large Molecules ◽  
Layer Method ◽  
Speed Up ◽  
Attachment Process

We have presented a multi-layer implementation of the equation of motion coupled-cluster method for the electron affinity, based on local and pair natural orbitals. The method gives consistent accuracy for both localized and delocalized anionic states. It results in many fold speedup in computational timing as compared to the canonical and DLPNO based implementation of the EA-EOM-CCSD method. We have also developed an explicit fragment-based approach which can lead to even higher speed-up with little loss in accuracy. The multi-layer method can be used to treat the environmental effect of both bonded and non-bonded nature on the electron attachment process in large molecules.<br>

Sign in / Sign up

Export Citation Format

Share Document