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4
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33746926606
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It is of interest to note that the relaxation of this selection rule in the condensed phase apparently requires the presence of adjacent molecules, such as O2, CO, or N2 [, ] during DEA to O2. Neighboring rare-gas atoms, such as Ar, Kr, or Xe, do not appear to cause relaxation of the above selection rule , 59, 505, H. Sambe, D. E. Ramaker, L. Parenteau, L. Sanche, Phys. Rev. Lett.
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(1987)
Chem. Phys. Lett.
, vol.156
, pp. 606
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Azria, R.1
Sanche, L.2
Parenteau, L.3
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23
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84926599579
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SIMION_ is a public access electrostatic lens analysis and design program available from D. A. Dahl, MS 2208, Idaho National Engineering Laboratory, EG&G Idaho Inc., P. O. Box 1625, Idaho Falls, ID 83415.
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24
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84926546766
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Alternatively, the electron energy may be fixed and the mass filter is scanned over its range to obtain a mass spectrum.
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0004067144
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edited by, A. R. Burns, E. B. Stechel, D. R. Jennison, Springer-Verlag, Berlin
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(1993)
Desorption Induced by Electronic Transitions, DIET V
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Guest, R.J.1
Bennett, R.A.2
Sylva, L.A.3
Sharpe, R.G.4
Barnard, J.C.5
Palmer, R.E.6
MacDonald, M.A.7
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84926535756
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This assumption is not unreasonable, since the disordered, dielectric solid investigated here is a van der Waals solid, i.e., it consists of physisorbed O2 molecules, separated by about 2.5 – 3.5 Å, with binding energies in the low meV range; this is much smaller than the average Ek of O- produced by DEA. Thus, the post dissociation elastic collision of an, e.g., 1.4-eV O- with an adjacent O2 molecule may, to first order, be approximated as an isolated scattering event (i.e., by classical mechanics formalism), since lattice dynamics are much slower than the time of motion of the target-projectile system.
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See, e.g., J. B. Marion, Classical Dynamics of Particles and Systems, 2nd ed. (Academic, New York 1970).
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44
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0000403983
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Can. J. Phys. 30, 185 (1952)
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(1952)
Can. J. Phys.
, vol.30
, pp. 185
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45
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84926568763
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31, 657 (1953).
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48
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84926595114
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for observations of core-excited resonances of O2 between 8 and 13 eV.
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50
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11, 3931.
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84926557165
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It is noted, that the O- yield function of Azria et al.. (Ref. [15], Fig. 2, top curve), associated with the second dissociation limit, displays a weak shoulder near 13.6 eV, in addition to the peak at 14.4 eV; thus, one could argue that perhaps both, the Σu+2(II) and Σg+2(II), resonances participate in DEA at these electron energies.
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