Influence of nuclear motion on resonant two-center photoionization

Interatomic-distance dependence of resonant energy-transfer phenomena

“…r,ge ≈ 1.18 × 10 −6 eV [29] is much larger than the Auger width Γ a . When a LiHe dimer [30] is considered instead, the single resonance splits into a multiplet of resonances, in accordance with the various vibrational transitions [18]. On each of these resonances, the nuclear motion tends to reduce the enhancement but not dramatically (F nuc ∼ 0.1 for favoured transitions ν i → ν a → ν f ).…”

“…In this case, the two equivalent electrons must be described by appropriately symmetrized wave functions and their interaction with the field by a two-particle extension of the operator ŴB . This leads to an additional factor of 4 in the 2CPI cross section [18]. Taking this into account and assuming that the field is exactly resonant (∆ = 0), the ratio of the 2CPI and direct photoionization cross sections becomes…”

“…The wave functions of the system are accordingly amended, Ψ i,a,f = Φ i,a,f (r, ξ)ψ (ν) i,a,f (R), to include the internuclear coordinate. When the derivation given above is repeated with these molecular states, the ratio of cross sections adopts the modified form [18]…”

“…mol contains a coherent sum over the intermediate state and an incohrent sum over the final state quantum numbers, including ν f [18].…”

“…Accordingly, inter-site energy transfers are expected to be the more efficient, the closer the atoms lie together. An interatomic process involving ICD is two-center resonant photoionization (2CPI) in a heteroatomic system of two atoms, say A and B [14][15][16][17][18]. Here, a neighboring atom B is first resonantly excited by photoabsorption, this way creating an autoionizing state of the two-center system, which afterwards stabilizes via ICD.…”