Neutralization and charge transfer in H⁺-H^-and H-H collisions

Abstract

Cross sections for charge transfer, neutralization and excitation in H-H and H- -H+ collisions are presented in the energy range 1-30 keV. The semiclassical close-coupling approach is used with a two-centre two-electron atomic state expansion and frozen total spin. All details of the two-centre atomic state expansion scheme are given. The basis is expanded onto the bound state of H- and the two-centre H(1s)-H(nlm ) states, where n covers the K, L and M shells. A good agreement with experiments is achieved for charge transfer, neutralization and excitation to H(2s) in H-H collisions. Disagreement with previously published close-coupling calculations and experimental data is noted, especially for two-electron charge transfer in H- -H+ .

Complex Formation of Adenosine 3',5'-Cyclic Monophosphate with β-Cyclodextrin: Kinetics and Mechanism by Ultrasonic Relaxation

“…15 Based on the crystallography studies, both the syn and anti glycosyl conformations of cAMP are found in the active site of PDE with the syn conformation of cAMP occurring in PDE10A2 and the anti conformation of cAMP occurring in PDE4D. 17 Upon cleavage of the phosphodiester bond by PDE, the resulting AMP favors the anti conformation. 18 However, the syn/anti glycosyl conformations of cAMP that resulted from ultrasonic relaxation are only observed when there are high concentrations of cAMP (e.g.…”

Switching classical trajectory Monte Carlo method to describe two-active-electron collisions

“…We have also analyzed the convergence with statistics estimating the standard deviation error of the probability as explained in [54], and we have found errors smaller than 3%. These cross sections are compared to experimental data [26,28], previous 4b-CTMC [36,38], and semiclassical atomic close-coupling [31] calculations. Our 4b-CTMC cross section agrees with that of Dimitriou et al [38], as it could be expected since these authors also employed the standard 4b-CTMC method.…”

“…Particular attention has been paid to this electron capture reaction from the theoretical side; it has been studied by means of semiclassical close coupling [29][30][31], perturbative first Born [32][33][34][35], and four-body CTMC (4b-CTMC) [36][37][38] approaches. The 4b-CTMC calculations of Becker and McKellar [37] drastically underestimated the cross section for reaction (1).…”

“…H + + H − collisions have been studied extensively, from both the experimental [39][40][41][42][43][44] and theoretical [30,31,[45][46][47][48][49][50][51][52] sides. In this respect, the main challenges of a classical description are to describe a stable two-electron target anion and to correctly represent the mutual neutralization process,…”

Cloud point extraction spectrophotometric determination of trace quantities of bismuth in urine

“…The disadvantages of liquid-liquid extraction include the use of large volumes of organic solvents. Nevertheless, several other techniques for pre-concentration of Bi have been proposed, including preconcentration using Mg-W cell electrodeposition, 14 preconcentration with sodium di-n-propyl dithiophosphinate and activated carbon in a batch method, flow injection on-line two stage solvent extraction, 15 flow injection on-line sorption preconcentration 16,17 and solid phase extraction. [18][19][20][21][22] When the micellar solution of a nonionic or weakly polar surfactant is heated, the surfactant changes from water soluble to oil soluble.…”