A study of electron scattering from benzene: Excitation of the 1B1 u , 3E2 g , and 1E1 u electronic states

We measured differential cross sections for electron-impact electronic excitation of pyrimidine, both as a function of electron energy up to 18 eV, and of scattering angle up to 180• . The emphasis of the present work is on recording detailed excitation functions revealing resonances in the excitation process. The differential cross sections were summed to obtain integral cross sections. These are compared to results of R-matrix calculations, which successfully reproduce both the magnitude of the cross section and the major resonant features. Comparison of the experiment to the calculated contributions of different symmetries to the integral cross section permitted assignment of several features to specific core-excited resonances. Comparison of the resonant structure of pyrimidine with that of benzene revealed pronounced similarities and thus a dominant role of π-π * excited states and resonances. Electron energy loss spectra were measured as a preparation for the cross section measurements and vibrational structure was observed for some of the triplet states. A detailed analysis of the electronic excited states of pyrimidine is also presented.

Section: A Dependence On Electron Energysupporting

confidence: 82%

“…7 and 8. The present pyrimidine data are, however, in very good agreement with the benzene data of Kato et al, 49 indicated by triangles in Figs. 7 and 8, especially in the range IV.…”

Section: A Dependence On Electron Energysupporting

confidence: 78%

See 1 more Smart Citation

Absolute cross sections for electronic excitation of pyrimidine by electron impact

Regeta

Allan

Mašín

et al. 2016

“…Note that similar estimates for the forward angle extrapolation of inelastic transitions have been successful for many other targets. [40][41][42] In the present work, the derived GOS-dipole forward angle extrapolation, plus or minus 50% (commensurate to the experimental uncertainty on the DCS data), is used as the range of forward angle DCS values in order to calculate realistic uncertainties for the derived ICS. The ICSs derived using the GOS-dipole extrapolation are also presented in Table III.…”

Section: Experimental Methods and Analysis Techniquementioning

confidence: 99%

Elastic and inelastic cross sections for low-energy electron collisions with pyrimidine

Mašín

Gorfinkiel

Jones

et al. 2012

Self Cite

We present theoretical elastic and electronic excitation cross sections and experimental electronic excitation cross sections for electron collisions with pyrimidine. We use the R-matrix method to determine elastic integral and differential cross sections and integral inelastic cross sections for energies up to 15 eV. The experimental inelastic cross sections have been determined in the 15-50 eV impact energy range. Typically, there is quite reasonable agreement between the theoretical and experimental integral inelastic cross sections. Calculated elastic cross sections agree very well with prior results.

“…Nonetheless, we caution that the Born approximation is not a very sophisticated approach and that as a result of this scaling procedures are often employed in conjunction with its use. 33,34 …”

Section: A Low Energies and Low Fields (0 E/n 0 35 Td) -The Need Formentioning

confidence: 99%

Transport coefficients and cross sections for electrons in water vapour: Comparison of cross section sets using an improved Boltzmann equation solution

Ness

Robson

Brunger

et al. 2012

This paper revisits the issues surrounding computation of electron transport properties in water vapour as a function of E/n0 (the ratio of the applied electric field to the water vapour number density) up to 1200 Td. We solve the Boltzmann equation using an improved version of the code of Ness and Robson [Phys. Rev. A 38, 1446 (1988)], facilitating the calculation of transport coefficients to a considerably higher degree of accuracy. This allows a correspondingly more discriminating test of the various electron–water vapour cross section sets proposed by a number of authors, which has become an important issue as such sets are now being applied to study electron driven processes in atmospheric phenomena [P. Thorn, L. Campbell, and M. Brunger, PMC Physics B 2, 1 (2009)] and in modeling charged particle tracks in matter [A. Munoz, F. Blanco, G. Garcia, P. A. Thorn, M. J. Brunger, J. P. Sullivan, and S. J. Buckman, Int. J. Mass Spectrom. 277, 175 (2008)].