In: Physical Review A: Atomic, Molecular, and Optical Physics, 2011, vol. 83, no. 3, p. 032713
In a joint experimental and theoretical effort, we carried out a detailed study of elastic electron scattering from Kr atoms. Absolute angle-differential cross sections for elastic electron scattering were measured over the energy range 0.3-9.8 eV with an energy width of about 13 meV at scattering angles between 0° and 180°. Excellent agreement is obtained between our experimental data and...
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In: Journal of Physics B: Atomic, Molecular and Optical Physics, 2011, vol. 44, no. 6, p. 065201
In a joint experimental and theoretical effort, we carried out a detailed study of electron impact excitation of the 4p⁵ 5s states of Kr. We present angle-differential cross sections over the entire angular range (0°–180°) for a number of energies in the near-threshold region, as well as energy scans for selected angles. The experimental results are in very satisfactory agreement with...
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In: Chimia, 2010, vol. 64, no. 3, p. 173-176
An instrument for the measurement of absolute dissociative electron attachment cross sections was constructed and applied to two prototype molecules, acetylene (C₂H₂) and deuterated acetylene (C₂D₂). The isotope effect at the first dissociative electron attachment band at 3 eV was determined-the cross section for C₂D⁻/C₂D₂ is 14.4 times smaller than that for C₂H⁻/C₂H₂. The...
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In: Physical Review A, 2010, vol. 81, no. 04, p. 042706
Absolute differential elastic and vibrational excitation cross sections up to v=11 were measured for CO in scattering angle ranges extending to 180° at energies between 0.2 and 5 eV (and an elastic measurement at 10 eV). The lowest angles were 0° for inelastic scattering and between 5° and 20° for elastic scattering, depending on energy. Integral cross sections were derived by integrating...
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In: Journal of Physics B: Atomic, Molecular and Optical Physics, 2010, vol. 43, no. 8, p. 085206
In a joint experimental and theoretical effort, we carried out a detailed study of electron scattering from Kr atoms in the energy range of the low-lying Kr⁻($4p^5 5s^2$) Feshbach resonances. Absolute angle-differential cross sections for elastic electron scattering were measured over the energy range 9.3–10.3 eV with an energy width of about 13 meV at scattering angles between 10° and...
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In: Physical Chemistry Chemical Physics, 2009, vol. 11, p. 7640-7648
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In: Journal of Physics B, 2009, vol. 42, no. 21, p. 215202
Using two different experimental setups with energy widths of about 6 and 13 meV, we obtained significantly improved results for the energy dependence of angle-differential (10°–180°) elastic and vibrationally inelastic cross sections for electron scattering from N₂ molecules in the energy range around the narrow N⁻₂(R²Σ⁺g) resonance. The energy location and the natural...
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In: Physical Review A, 2009, vol. 80, no. 1, p. 012706
Absolute partial cross sections for dissociative electron attachment to H–C≡C–H and D–C≡C–D have been measured using a time-of-flight ion spectrometer combined with a trochoidal electron monochromator. For C₂H₂ the present data are in good agreement with the total cross sections measured previously in our laboratory using the total ion-collection method. The present measurements...
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In: Physical Review A, 2008, vol. 77, p. 042715
Experimental and calculated absolute differential cross sections for the scattering of low-energy electrons from ethene are presented. Emphasis is on the excitation of the ã³B1u³(π,π*) state, but selected elastic and vibrational excitation cross sections are also given. In contrast to earlier calculations, which were nearly a factor of 2 too large,...
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In: Physical Chemistry Chemical Physics, 2008, vol. 10, p. 1507-1511
Dissociative electron attachment (DEA) to diethyl ether yielded primarily the C₂H₅O⁻ ion, with a strong Feshbach resonance band at 9.1 eV and a weaker shape resonance band at 3.89 eV. Very similar spectra were obtained for dibutyl ether, with C₄H₉O⁻ bands at 8.0 and 3.6 eV. Some of these primary ions subsequently lost H₂ and yielded weaker signals of the C₂H₃O⁻ and...
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