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Journal ArticleDOI

Photoablösung von Elektronen bei einigen stabilen negativen Ionen

01 May 1970-Zeitschrift für Naturforschung A-Vol. 25, Iss: 5, pp 621-626
TL;DR: In this paper, the authors measured the photodetaehment of electrons from some stable negative ions with cross sections of about 10-17 cm2, and the following minimal detachment energies were found: H-: 0.776 eV, C-*: < 0.5 eV and SO-: 1.05 eV.
Abstract: Photodetaehment of electrons from some stable negative ions has been measured. Cross sections of about 10-17 cm2, and the following minimal detachment energies were found: H-: 0.776 eV, C-*: < 0.5 eV, CH-: 0.74 eV, C2- : 3.54 eV, C2H- : 3.73 eV, SO-: 1.09 eV, and SO-: 1.0 eV with an accuracy better than + 0.05 eV.
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Journal ArticleDOI
TL;DR: In this article, the energy spectra of electrons photodetached from a fixed frequency argon ion laser were studied, and the angular distribution anisotropy parameter β was measured for OH− and NH2− at 4880 A, as −0.993 ± 0.040, and 0.027± 0.012, respectively.
Abstract: Using a fixed frequency argon ion laser we have studied the energy spectra of electrons photodetached from OH−, NH2−, NH−, SO2−, and S2−. We determined the following electron affinities: EA(OH)= 1.829−0.014+0.010 eV, EA(NH2)=0.779±0.037 eV, EA(NH)=0.38±0.03 eV, EA(SO2)=1.097±0.036 eV, and EA(S2)=1.663±0.040 eV. Additionally, the angular distribution anisotropy parameter β was measured for OH− and NH2− at 4880 A, as −0.993 ± 0.040, and 0.027±0.012, respectively, and information about negative ion vibrational constants is presented.

206 citations

Journal ArticleDOI
TL;DR: The absolute electron affinities of pi charge transfer complex acceptors have been examined and the "best" values have been chosen as discussed by the authors, and the magnetron results for anthraquinone and benzoquinone are not in agreement with the half-wave reduction potential data.
Abstract: The absolute electron affinities of pi charge transfer complex acceptors have been examined and the ’’best’’ values have been chosen. All of the results obtained by the magnetron method, including the estimates for hexafluorobenzene and tetracyanoethylene, were accepted. However, the magnetron results for anthraquinone and benzoquinone are not in agreement with charge transfer complex and half‐wave reduction potential data. The half‐wave reduction potential data and the charge transfer complex data for all of the other acceptors for which absolute electron affinities are available were found to be consistent with the usual correlation equations and their associated assumptions. The parameters from these correlations have been used to calculate the absolute electron affinities for about 150 acceptors.

178 citations

Journal ArticleDOI
TL;DR: In this article, the electron affinity of the ground state of C2 and the ionization potentials of ground and first excited states of C 2 have been computed, and particular atten...
Abstract: Coupled‐cluster methods including effects of triple excitations have been used with large basis sets to study several electronic states of C2, C−2, and C+2. re, ωe, De, and Te have been computed for each state considered. For those states for which experimental data are available, the errors are typically less than 0.002 A, 20 cm−1, and 0.1 eV for re, ωe, and De, respectively. These errors are comparable with the best previous results on C2 and significantly smaller than those for previous calculations on C−2 and C+2. For Te the results are also satisfactory and comparable with previous work, but some difficulties arise when one or both of the states have considerable multireference character. For two states of C+2 not experimentally characterized, the present data should be sufficiently accurate to be of some assistance to experimental studies.The electron affinity of the ground state of C2 and the ionization potentials of the ground and first excited states of C2 have been computed, and particular atten...

137 citations

Journal ArticleDOI
TL;DR: In this paper, the electron affinity of CH was determined to be (1.238 ± 0.008) eV and the 4 Σ− CH term energy was found to be 0.742 ± 0.008 eV.

133 citations