Electron Collisions With Ammonia And Formamide In The Low- And Intermediate-energy Ranges

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)We report an investigation on electron collisions with two nitrogen-containing compounds, namely ammonia (NH3) and formamide (NH2CHO). For ammonia, both theoretical and experimental differential, integral, and momentum-transfer cross sections, as well as calculated grand-total and total absorption cross sections, are reported in the 50-500 eV incident energy range. Calculated results of various cross sections are also reported for energies below 50 eV. Experimentally, angular distributions of the scattered electrons were measured using a crossed electron beam-molecular beam geometry and then converted to absolute differential cross sections using the relative flow technique. Absolute integral and momentum-transfer cross sections for elastic e - ammonia scattering were also derived from the measured differential cross sections. For formamide, only theoretical cross sections are presented in the 1-500 eV incident energy range. A single-center-expansion technique combined with the method of Padé was used in our calculations. For both targets, our calculated cross sections are compared with the present measured data and with the theoretical and experimental data available in the literature and show generally good agreement. Moreover, for formamide, two shape resonances located at 3.5 eV and 15 eV which correspond to the continuum 2A'' and 2A' scattering symmetries, respectively, are identified. The former can be associated to the 2B1 shape resonance in formaldehyde located at around 2.5 eV, whereas the latter can be related to the 2E resonance in ammonia at about 10 eV. 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Advances On The Brazilian Toroidal Grating Monochromator (tgm) Beamline

We report on an important advance for the vacuum ultraviolet and soft X-ray TGM beamline at Laboratório Nacional de Luz Síncrotron (LNLS). This beamline provides photons in the energy range 12-330 eV using three gratings. It is well known that TGMs deliver relatively high flux at these energies but harmonic contamination can be a serious problem. Of special interest for the users is the range between 12 and 21 eV covered by one of the gratings for studies of outer and inner valence ionization processes in gases as well as solids. Here, we report a solution to the harmonic contamination problems based on a noble gas phase filter combined with thin metal foil barriers. © 2005 Elsevier B.V. All rights reserved.144-14711251127Suits, A.G., (1995) Rev. Sci. Instrum., 66 (10), p. 4841Mercier, B., (2000) J. Vac. Sci. Technol. A, 18 (5), p. 253

Electron Scattering By Methanol And Ethanol: A Joint Theoretical- Experimental Investigation

We present a joint theoretical-experimental study on electron scattering by methanol (CH 3OH) and ethanol (C 2H 5OH) in a wide energy range. Experimental differential, integral and momentum-transfer cross sections for elastic electron scattering by ethanol are reported in the 100-1000 eV energy range. The experimental angular distributions of the energy-selected electrons are measured and converted to absolute cross sections using the relative flow technique. Moreover, elastic, total, and total absorption cross sections for both alcohols are calculated in the 1-500 eV energy range. A complex optical potential is used to represent the dynamics of the electron-alcohol interaction, whereas the scattering equations are solved iteratively using the Padé's approximant technique. Our calculated data agree well with those obtained using the Schwinger multichannel method at energies up to 20 eV. 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