The present study deals with the calculation of elastic [integrated and differential cross section (DCS)], momentum-transfer, excitation, ionization sections for electron impact on S${}_{2}$ molecules using R-matrix method. target states are represented by including correlations via a configuration-interaction technique. We used double zeta plus polarization Gaussian basis set contracted as (12,8,1)/(6,4,1) S atoms. results static exchange, correlated one-state, 20-state close-coupling...

The three-body breakup of [C2H2]3+ formed in collision with Xe9+ moving at 0.5 atomic units velocity is studied by using recoil ion momentum spectroscopy. Three-body channels leading to (H+, C+, CH+) and H+, C2+) fragments are observed the experiment their kinetic energy release measured. into occurs via concerted sequential modes, whereas shows only mode. By collecting events coming exclusively from CH+), we have determined for unimolecular fragmentation molecular intermediate, [C2H]2+. ab...

We have employed the $R$-matrix method to compute elastic (integrated and differential), momentum-transfer, excitation, ionization cross sections for electron impact on NH radical. The target states are represented by including correlations via a configuration interaction technique. results of static exchange, correlated one-state interaction, 19-state close-coupling approximation presented. detected stable anionic bound state ${}^{2}\ensuremath{\Pi}$ NH${}^{\ensuremath{-}}$ having...

Cross sections for rotational excitation and de-excitation of the HeH+ ion by an electron impact are computed using a theoretical approach that combines UK R-matrix code multi-channel quantum defect theory. The thermally-averaged rate coefficients derived from obtained cross fitted to analytical formula valid wide range temperatures.

We have computed elastic differential, momentum-transfer, excitation, ionization cross sections, collision frequencies, and scattering length for electron impact on the ${\mathrm{O}}_{2}$ molecule, which are using R-matrix method. The results of static exchange, correlated one-state, 22-state close-coupling approximation presented. detected a stable anionic bound state ${}^{2}{\ensuremath{\Pi}}_{g}$ ${\mathrm{O}}_{2}{}^{\ensuremath{-}}$ two shape resonances ${}^{2}{\ensuremath{\Pi}}_{u}$...

We have employed the R-matrix method [1] to compute elastic (integrated and differential cross section DCS), momentum-transfer excitation ionization sections for electron impact on S2 molecule. calculated DCS, in correlated one-state model, by using POLYDCS program of Sanna Gianturco [2]. The data section, generated from is used effective collision frequencies [3] over a wide temperature range (200-30000 K). are binary-encounter Bethe (BEB) model [4] compared with [5, 6].

We have measured electron and hole multiplication factors impact ionization coefficients in 550 Å GaAs/500 Al0.3Ga0.7As quantum wells with an intermediate Al0.45Ga0.55As barrier (50 100 Å) inserted the well region. It is seen that while value of α(E) insensitive to position well, β(E) very sensitive. The α/β varies from less than unity 5, depending on this barrier. These results suggest confinement scattering play a major role making greater these multilayered structures.

The PH radical is an interesting case to study because of its ${\ensuremath{\pi}}^{2}$ electronic configuration, which leads the three low-lying states, $X$ ${}^{3}{\ensuremath{\Sigma}}^{\ensuremath{-}}$, $a$ ${}^{1}\ensuremath{\Delta}$, and $b$ ${}^{1}{\ensuremath{\Sigma}}^{+}$. singlet states possess long lifetimes, direct combination with ground state not allowed. This similar ${\mathrm{O}}_{2}$ case. $\mathit{R}$-matrix method employed calculate elastic differential integral cross...

We have analyzed data obtained from double-crystal x-ray rocking curve measurements to determine the lattice constants, strain relaxation, thickness, and critical thickness of a thin InxGa1−xAs layer embedded in GaAs. The use very wide scan angle (∼2.0°) allows simultaneous determination buried with greater accuracy. thicknesses so for InGaAs layers are smaller than that predicted by energy balance model larger force model.

The SO radical with an even number of electrons belongs to open-shell system due its ${\ensuremath{\pi}}^{2}$ ground-state electronic configuration. This configuration gives rise three low-lying states $X {}^{3}{\ensuremath{\Sigma}}^{\ensuremath{-}}$, $a {}^{1}\ensuremath{\Delta}$, and $b {}^{1}{\ensuremath{\Sigma}}^{+}$. inclusion these target in a trial wave function the entire scattering have important implications resonances that may be detected this molecule. $R$-matrix method is...

ABSTRACT HCO+ is one of the most abundant polyatomic ion in Universe, also its presence planetary atmospheres and interstellar medium (ISM) makes it an interesting case to study. Low energy e−-HCO+ collisions result rotational excitation other molecular processes. In this study, cross-sections for transitions are evaluated four levels (j = 0, 1, 2, 3) using UK R-matrix method multichannel quantum defect theory (MQDT). The used generate scattering matrices, through which computed. past two...

The results of ab initio scattering calculations for low-energy electron collisions with the B${}_{2}$ molecule using $R$-matrix method have been presented. differential and momentum-transfer cross sections along effective collision frequency over a wide temperature range (300--30 000 K) are computed at one-state close-coupling level. In this work, 61-state performed to compute integral (elastic excitations). We investigated five resonances: two in excitation...