Differential and integrated cross sections for the electron excitation of the 4¹P^ostate of calcium atom

Abstract

Differential cross section (DCS) data for excitation of the 4 1 P o state (2.93 eV) of Ca atoms by electrons have been obtained using a crossed electron-atom beam technique. The measurements were divided into two groups. The first one consists of measurements at 10, 20, 40, 60 and 100 eV impact electron energies from 1 • to 10 • scattering angle interval. The second group of measurements are those at larger scattering angles (10 • -150 • ) at the same energies except 100 eV. Absolute values have been obtained by normalizing generalized oscillator strengths (GOS) to optical oscillator strength (OOS) in the minimum momentum transfer squared (K 2 ) limit. Integral, momentum transfer and viscosity cross sections have been determined from DCSs. A comparison is made with existing relativistic distorted wave calculation.

On the Application of Stark Broadening Data Determined with a Semiclassical Perturbation Approach

“…Na I data [174] have been used for the derivation of electron density radial profiles from Stark broadening in a sodium plasma produced by laser resonance saturation [175] and for the study of the mechanisms of resonant laser ionization [176], Be II [177] data for oscillator strength ratio measurements [178], Ca I [179,180] for the determination of differential and integrated cross sections for the electron excitation of the 41Po state of calcium atom [181] and for investigation of charged particle motion in an explosively generated ionizing shock [182], Ca II [137] for chlorine detection in cement with laser-induced breakdown spectroscopy [183] and for dynamical plasma study during CaCu3Ti4O12 and Ba0.6Sr0.4TiO3 pulsed laser deposition [184], Mg I [185] and Mg II [186] for consideration of plasma plume induced during laser welding of magnesium alloys [187], Sr I [188] for investigation of vapor-phase oxidation during pulsed laser deposition of SrBi2Ta2O9. [189], for the measurement and control of ionization of the depositing flux during thin film growth [190] and for space and time resolved emission spectroscopy of Sr2FeMoO6 laser induced plasma [191], Li II [192] for examination of spatial and temporal variations of electron temperatures and densities from EUV-emitting lithium plasmas [193] and for modeling of continuous absorption of electromagnetic radiation in dense partially ionized plasmas [194], Ba I and Ba II [152,153] for investigation of plasma properties of laser-ablated strontium target [195] and for laser-based optical emission studies of barium plasma [196], Ag I [197] for determination of absolute differential cross sections for electron excitation of silver at small scattering angles [198], Cd I [199] for investigation of cadmium plasma produced by laser ablation, namely for its diagnostics [200], fo...…”

Electron collisions by metal atom vapours

“…Its strong resonance line is suitable for optical pumping at wavelengths in visible domain. Recently, the electron excitation of the 4 1 P state (Murray and Cvejanovic´, 2003;Milisavljevic´et al, 2004;Chauhan et al, 2005;Kawazoe et al, 2006) and the 1;3 D states (Muktavat et al, 2002) were studied, and excitation and ionization (Stevenson and Crowe, 2004) and elastic cross sections (Milisavljevic´et al, 2005) have been measured.…”

Optical and Electron Spectrometry of Molecules of Biological Interest

“…Optical Materials, ISCOM07, Belgrade, Serbia, September [3][4][5][6][7]2007 Optical and Electron Spectrometry of Molecules of Biological Interest Optical absorption and emission spectroscopy together with low energy electron interaction (elastic scattering, excitation, ionization, resonances) with biologically relevant molecules (nitrogen, oxygen, water, alcohols, tetrahydrofuran, tetrahydrofurfuril alcohol, 3-hydroxytetrahydrofuran, pyrimidine, glycine, alanine) are studied in order to understand radiation damage and to investigate the presence of pollutants in the atmosphere. Versatile high resolution electron spectrometers are used in the present study of electron-molecule interactions.…”

“…The first spectrometer ESMA, described in detail elsewhere [6], consists of the titanium oven heated by coaxial heater and hemispherical-energy selectors both in monochromator and analyzer as well as corresponding cylindrical lenses for accelerating, decelerating, and focusing the electron beam. The scattered electrons were energy analyzed by the selector, and were detected by a single-channel electron multiplier.…”