A Direct Experimental Determination of the Electron Affinity of Oxygen

Abstract

The electron affinity of oxygen atoms for one electron, the negative of the energy change at absolute zero of the reaction e−+Ogas→Ogas−,has been determined to be 70.8±2.0 kcal./mole. The method used was to determine the ratio of negative ions to electrons leaving a hot filament surface exposed to oxygen gas at a low pressure.

Exciton and Low‐Energy Interband Structures in SrO and BaO

“…Since the separation of the two doublets in SrO is about 6~L o and EPC cannot be responsible for this second doublet as one would expect a separation of the order of WLO or smaller. We might identify I1 as the EPC of I ; this however would leave a value for the spin-orbit splitting of x 3 5 0 meV, a value larger by a factor of 15 from that predicted [15] for the 0-ion, and would not explain why one obtains separations of 73 and 44 meV instead of 60 meV. Also it seems to us that the strength of this structure is much too large for any type of three-particle complex.…”

Surface ionization

“…20. Определение энергии сродства к электрону методом отрицательной поверхностной ионизации Формула (63) была использована Майером с сотрудниками для опре-деления £ атомов хлора 89 ' 97 , брома 98 , иода 4 и кислорода 94 · 95 . Измерялось отношение -р в приборе типа магнетрона.…”

“…Наиболее прямым методом определения S -методом фотоионизации отрицательных ионов -было найдено для атомов кислорода S -l,^8 б 90 . Из формул (56) и (60) следует, что при таком значении S ток /~ в условиях опытов 94 ' 95 должен быть так мал, что вряд ли может быть вообще измерен.…”

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

“…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.…”

“…threshold ( 2 P J =1/2,3/2 → 3 P J =0,1,2 ) has been addressed to establish an accurate value for the electron affinity [2,11,13], the energies of the individual fine structure transitions [11,12], as well as the precise energy dependence of the photodetachment cross section [4,12]; in total the photodetachment cross section is experimentally determined up to photon energies of 4 eV, and only a single experimental study [4] has addressed the photodetachment cross section in the region where production of the 1 D state of oxygen is energetically allowed. Another class of experiments (green arrows in Fig.…”