The relative optical excitation functions and polarizations of the Sr resonance line (4607 \AA{}) and of the ${\mathrm{Sr}}^{+}$ resonance lines (4078 and 4216 \AA{}) have been measured, using crossed electron and strontium-atom beams, for electron energies from the excitation thresholds to 1497 eV. The electron-beam energy resolution was \ensuremath{\sim} 0.22 eV for energies below 13 eV, and the atom beam was optically thin. The excitation functions of the ionic lines were measured relative to that of the atomic resonance line at fixed energies near the maxima of the excitation functions. Using spontaneous-emission branching ratios, this yields the ratios of total excitation cross sections for the atomic and ionic resonance levels (including cascades). The Sr $5^{1}P$ excitation function has been normalized to Born theory taking account of cascade at 1497 eV, where the energy dependence of the excitation function has converged to the theoretical behavior. The resulting normalized cross sections have been compared with available theoretical calculations and other measurements. The 4607-\AA{} polarization function is consistent with the theoretical threshold limit within experimental uncertainity.The relative optical excitation functions and polarizations of the Sr resonance line (4607 \AA{}) and of the ${\mathrm{Sr}}^{+}$ resonance lines (4078 and 4216 \AA{}) have been measured, using crossed electron and strontium-atom beams, for electron energies from the excitation thresholds to 1497 eV. The electron-beam energy resolution was \ensuremath{\sim} 0.22 eV for energies below 13 eV, and the atom beam was optically thin. The excitation functions of the ionic lines were measured relative to that of the atomic resonance line at fixed energies near the maxima of the excitation functions. Using spontaneous-emission branching ratios, this yields the ratios of total excitation cross sections for the atomic and ionic resonance levels (including cascades). The Sr $5^{1}P$ excitation function has been normalized to Born theory taking account of cascade at 1497 eV, where the energy dependence of the excitation function has converged to the theoretical behavior. The resulting normalized cross sections have been compared with available theoretical calculations and other measurements. The 4607-\AA{} polarization function is consistent with the theoretical threshold limit within experimental uncertainity.

Physical Review AMar 1, 197627 citations

Relative oscillator strengths of the atomic lines of erbium

Kiril B. Blagoev, V. A. Kamarovskii

Optics and SpectroscopyMar 1, 19772 citations

Hyperfine Structure in the Spectrum of Erbium

Kiyoshi Murakawa, Shigeki Suwa

Physical ReviewFeb 15, 195213 citations

Effect of the low-lying D level on the cross section for excitation by slow electrons of the Cs atom resonance line

I. I. Fabrikant

The cross sections of the excitation of cesium atoms by slow (E< or =5eV) electrons are calculated in the approximation of strong coupling of the 6s, 6p, and 5d states. It is shown that the inclusion of the 5d level reduces the total excitation cross sections significantly (by about 1/3). Such a change is explained by the presence of a long-range dipole interaction between the low-lying 6p and 5d levels. The influence of this interaction on the magnitude of the cross section is analyzed by a model example. (AIP)The cross sections of the excitation of cesium atoms by slow (E< or =5eV) electrons are calculated in the approximation of strong coupling of the 6s, 6p, and 5d states. It is shown that the inclusion of the 5d level reduces the total excitation cross sections significantly (by about 1/3). Such a change is explained by the presence of a long-range dipole interaction between the low-lying 6p and 5d levels. The influence of this interaction on the magnitude of the cross section is analyzed by a model example. (AIP)

Aug 1, 19761 citation

Electron excitation of the resonance lines of the alkali-metal atoms

S. T. Chen, Alan C. Gallagher

We have measured the relative optical-excitation functions and polarizations of the K, Rb, and Cs resonance lines, using crossed electron and atom beams, for electron energies from threshold to 1500 eV. The electron energy resolution was \ensuremath{\sim}0.25 eV for energies below 13 eV, and the atom beam was optically thin. The atomic resonance-level ( ${n}^{2}P$ ) excitation functions have been normalized to the Born theory in the high-energy limit. Comparisons are made with other measurements and calculations. The polarizations and total cross sections for H, Li, Na, K, Rb, and Cs are also compared with each other in reduced units to investigate systematic behavior.We have measured the relative optical-excitation functions and polarizations of the K, Rb, and Cs resonance lines, using crossed electron and atom beams, for electron energies from threshold to 1500 eV. The electron energy resolution was \ensuremath{\sim}0.25 eV for energies below 13 eV, and the atom beam was optically thin. The atomic resonance-level (${n}^{2}P$) excitation functions have been normalized to the Born theory in the high-energy limit. Comparisons are made with other measurements and calculations. The polarizations and total cross sections for H, Li, Na, K, Rb, and Cs are also compared with each other in reduced units to investigate systematic behavior.

Physical Review AFeb 1, 197889 citations

The relative optical excitation functions and polarizations of the Sr resonance line (4607 \AA{}) and of the

{\mathrm{Sr}}^{+}

resonance lines (4078 and 4216 \AA{}) have been measured, using crossed electron and strontium-atom beams, for electron energies from the excitation thresholds to 1497 eV. The electron-beam energy resolution was \ensuremath{\sim} 0.22 eV for energies below 13 eV, and the atom beam was optically thin. The excitation functions of the ionic lines were measured relative to that of the atomic resonance line at fixed energies near the maxima of the excitation functions. Using spontaneous-emission branching ratios, this yields the ratios of total excitation cross sections for the atomic and ionic resonance levels (including cascades). The Sr

5^{1}P

excitation function has been normalized to Born theory taking account of cascade at 1497 eV, where the energy dependence of the excitation function has converged to the theoretical behavior. The resulting normalized cross sections have been compared with available theoretical calculations and other measurements. The 4607-\AA{} polarization function is consistent with the theoretical threshold limit within experimental uncertainity.

{n}^{2}P

) excitation functions have been normalized to the Born theory in the high-energy limit. Comparisons are made with other measurements and calculations. The polarizations and total cross sections for H, Li, Na, K, Rb, and Cs are also compared with each other in reduced units to investigate systematic behavior.