Observation of two-center interference effects for electron impact ionization of N₂

Abstract

In 1966, Cohen and Fano (1966 Phys. Rev. 150 30) suggested that one should be able to observe the equivalent of Young's double slit interference if the double slits were replaced by a diatomic molecule. This suggestion inspired many experimental and theoretical studies searching for double slit interference effects both for photon and particle ionization of diatomic molecules. These effects turned out to be so small for particle ionization that this work proceeded slowly and evidence for interference effects were only found by looking at cross section ratios. Most of the early particle work concentrated on double differential cross sections for heavy particle scattering and the first evidence for two-center interference for electron-impact triple differential cross section (TDCS) did not appear until 2006 for ionization of H 2. Subsequent work has now firmly established that two-center interference effects can be seen in the TDCS for electronimpact ionization of H 2. However, in spite of several experimental and theoretical studies, similar effects have not been found for electron-impact ionization of N 2. Here we report the first evidence for two-center interference for electron-impact ionization of N 2 .

Comparison of experimental and theoretical triple differential cross sections for the single ionization ofCO2 (1πg)by electron impact

“…True coincidences are selected by setting conditions on the peak in the coincidence time spectrum. Further experimental details may be found in [30]- [33].…”

“…A summary of this work up to 2010 was given by Madison and Al Hagan [19]. More recently, studies have been performed for ionization of CH 4 [20], [21], tetrahydrofuran and tetrahydrofurfuryl [22], NH3 [23], the cyclic ethers tetrahydrofuran, tetrahydropyran and 1,4-dioxane [24], tetrahydropyran and 1,4-dioxane [25], phenol [26], N 2 [27], ethane [28], and furfural [29]. The M3DW has not been previously applied to CO 2 .…”

Differential Cross Sections for Elastic Scattering of Electrons From Molecular Nitrogen

“…They calculated the recoil and binary peak ratios for the outer orbitals of the N2 molecule, 3σg, 1πu, 2σ, using the model they produced. In a study to examine interference effects, Chaluvadi et al [18]. With this study, results showing that interference effects are observed as a result of ionization of nitrogen molecule for the first time in the literature.…”

Projectile charge effects on the differential cross sections for the ionization of molecular nitrogen by positrons and electrons

“…The DWBA formalism along with the orientation averaged molecular orbital approximation is capable to produce reliable TDCS results at the incident electron energy 250 eV used in the present study [11,56]. The DWBA has been very successful at the higher energies [9], however the DWBA with PCI effects have been found successful at the intermediate energies also [56].…”