Resonances and their effects above and below the electron-impact ionization threshold of D₂

Nondissociative electron and photon ionization cross sections of molecular hydrogen and deuterium

“…Golden (1971) and Schowengerdt and Golden (1975) have shown that the formation of 'f' and 'g' H − 2 and subsequent decay by one-or two-electron processes to H + 2 is an important indirect contribution to the near-threshold electron-impact ionization of H 2 . Weingartshofer and Eyb (1975) found that D 2 has stronger features than H 2 above the ionization threshold and identified six distinct peaks in D 2 , in contrast to only two peaks in H 2 . The stronger spectrum of D 2 enabled Weingartshofer and Eyb (1975) to resolve several autoionizing triplets (d 3 u , k 3 u and n 3 u ).…”

“…Weingartshofer and Eyb (1975) found that D 2 has stronger features than H 2 above the ionization threshold and identified six distinct peaks in D 2 , in contrast to only two peaks in H 2 . The stronger spectrum of D 2 enabled Weingartshofer and Eyb (1975) to resolve several autoionizing triplets (d 3 u , k 3 u and n 3 u ). They found that the autoionization contribution of the triplet and resonance series to total ionization decreases from 90% to 30% as E increases from 15.47 to 16.10 eV.…”

Ab InitioCalculations of Vibrationally Resolved Resonances in Electron Collisions withH2, HD, andD2<

“…Over the last thirty years, many experiments have studied these resonance series for e-H 2 [2][3][4][5][6][7][8][9] as well as e-D 2 [2,6,7,9,10] and e-HD [7,9]. The standard model for these anionic Feshbach-type resonances is that the electron is temporarily trapped in a potential associated with a particular excited state of the target.…”

“…The vibrational energy levels are shown in Table III points on the potential curve in the swapover area, it is impossible to compute reliably the levels in this region. The vibrational labeling used in Table III for the energy levels of series c is determined by the existence of the 11.19 eV level from [3] in H 2 2 and the 11.25 eV level from [10] in D 2 2 . Under the assumption that these are correct, our results appear to be just over 0.4 eV above the experimental results for all the isotopomers, with excellent matching between the vibrational spacings, particularly for the lower levels.…”