Elastic Scattering from Atomic Oxygen and Photodetachment fromO−

Abstract

A method developed by Temkin to allow for polarization effects in low-energy scattering of electrons from atoms has been extended to include all direct contributions from the polarized orbitals and the exchange contribution from the most important type of polarized orbital. The analysis has been applied to atoms with configurations ls 2 2s 2 2p<t. Cross sections for the elastic scattering of slow electrons by atomic oxygen are given for energies <6.5 eV. The additional direct polarization terms are found to be important in calculating s-wave elastic cross sections for O, as they decrease the cross section by a factor of 2 near threshold; but the exchange d orbitals of the oxygen atom are relatively unimportant in relation to all direct polarization terms. Photodetachment cross sections for 0~ are given for photon energies in the range 1.47 to 5.5 eV, and are found to be in good agreement with experiment when polarization terms are included and the dipole velocity approximation is used.

Scattering of Electrons by C, N, O,N+,O+, andHenry1, Burke2, Sinfailam3 1969Phys. Rev.Self Cite2871300View full textAdd to dashboardCite

“…We used recent stopping-power data 4 "" 6 and data obtained in this laboratory. 7 The ionization cross sections in absolute units are calculated by normalizing our data to the ionization cross section o^= 53 b reported by Khan et al? for protons at 100 keV.…”

Ab initiocalculation of frequency-dependent atomic dipole polarizability

“…Henry [4] also determined the static dipole polarizability of atomic oxygen. He extended the method developed by Temkin [5] to include all direct contributions from the polarized orbitals and the exchange contribution from the most important type of polarized orbital.…”

Photoelectron spectroscopy ofO−at 266 nm: Ratio of ground- and excited-state atomic oxygen production and channel-resolved photoelectron anisotropy parameters

“…At lower energy, branching ratios between the fine structure components of the O( 2 P J ) → O( 3 P J ) transitions have been studied [6,7,9]. On the theoretical side, some studies around 266 nm have only reported the total photodetachment cross section [15][16][17][18][19], while partial channel-resolved cross sections have indeed also been presented in several calculations [20][21][22][23] allowing a direct comparison to the present experiment. Thus, the ratio 1 D : 3 P after detachment has so far been calculated to ∼0.8 [20] (from their Fig.…”

“…Under these aspects the photodetachment process has been the subject of both experimental [2][3][4][5][6][7][8][9][10][11][12][13][14] and theoretical [3,[15][16][17][18][19][20][21][22][23][24][25] investigations for more than half a century.…”

“…In this paper we report on an investigation of the electronoxygen scattering states formed by photodetachment at 266 nm, thus with an internal energy where the production of excited state O( 1 D) and ground state O( 3 P ) compete, and where so far only theoretical calculations have been available [15][16][17][18][19][20][21][22][23]. The experiment uses a fast beam of ions crossed by a pulsed laser beam inside a magnetic-bottle photoelectron spectrometer (see Refs.…”