(γ, 2e) photo-double ionization of N₂molecules for equal energy sharing

Abstract

We have determined the multiply differential cross sections (MDCS) of the vertical photo-double ionization of diatomic nitrogen with coincidence detection of the ejected electrons, for fixed and random orientations of the internuclear axis, using the correlated product of two two-centre continuum Coulomb functions for the description of the two ejected electrons, which satisfies the exact asymptotic conditions. To verify our procedure, we have applied it to the photo-double ionization of diatomic hydrogen for which many experimental and theoretical results are available. Our results on diatomic hydrogen show the influence of the initial state correlation. In the case of diatomic nitrogen only, the photo-double ionization of the 3σg orbital is considered resulting in the 1Σg state of the residual N dication. The case of the nearby 3Πu final state having an open shell configuration will be considered in a future paper. Our results confirm the symmetry properties of the MDCS and give the optimal ejection angles. A comparison is also made with results obtained by the Gaussian parametrization method.

Auger decay and subsequent fragmentation pathways of ethylene followingK-shell ionization

“…[16,29] as examples). The following channels are observed from the interaction of the E γ = 310 eV right circularly polarized photons with the ethylene molecule:…”

“…Following the detailed investigations of small diatomic molecules in the past as, for example, H 2 [12][13][14], N 2 [5,15,16], CO [17], and O 2 [18][19][20], attention has been turned to more complex systems such as CO 2 [21][22][23][24], H 2 O [25,26], CH 4 [27,28], and C 2 H 2 and C 2 H 4 [29]. A polyatomic molecule can additionally disperse energy between its constituents at conical intersections on the potential energy surfaces (PESs), undergo conformation changes (such as isomerization or twisting), and its fragments can be electronically and vibrationally excited (see, for example, [29][30][31][32][33]).…”

Theoretical study of $(\gamma ,2e)$ photo-double ionization of CO2in the equal energy sharing regime using Dyson orbitals and the parameterized three center continuum wave function

“…The theoretical procedure that we apply in the determination of the MDCS of the e , 2 ( ) g PDI of CO 2 is quite similar to that described in [1] for the N 2 molecule. The main difference here is that in the final state, the residual CO 2 2+ dication, whose electronic configuration is given by , whose fundamental state is a singlet state.…”

“…The two ejected electrons represented symbolically by 1 2 c c in the transition matrix elements will be described by a correlated product of the three-center continuum (ThCC) wave function as applied in [1,2,25] for the two-center case,…”

“…Theoretical study of γ; 2e ð Þ photo-double ionization of CO 2 in the equal energy sharing regime using Dyson orbitals and the parameterized three center continuum wave function O Alwan 1 , O Chuluunbaatar 2,3 , X Assfeld 4 and B B Joulakian 1…”