No abstract available

[en] A simple regioselective synthesis of cinnoline derivatives was achieved by a one-pot three component synthetic methodology. New substituted 7,8-dihydrocinnolin-5(6H)-ones are prepared via one-pot three component reaction of arylglyoxals with 1,3-cyclohexanedione and dimedone in the presence of hydrazine hydrate in moderate to good yields

No abstract available

[en] The effect of electron scavengers on diamagnetic polarization Psub(D) in cyclohexane were examined and compared with the experimental yield of Ps formation (inhibition and anti-inhibition effects) for the same solutions. The effect of C₆F₆ on Psub(D) has been shown to sharply contrast to the anti-inhibition effect in Ps formation. These results suggest that Muonium formation is different from Ps formation, and does not agree with the simple spur reaction model. (Auth.)

[en] In order to clarify the mechanism of Mu formation, effects of scavengers on Psub(D) in cyclohexane were examined and compared with the experimental yield of Ps formation for the same solutions. These results suggest that Mu formation is different from Ps formation, and does not agree with the simple spur reaction model

No abstract available

No abstract available

[en] The experimental data of Tabata et al on ion pair recombination in pulse-irradiated cyclohexane are shown to be adequately described by the second-order equal concentration kinetic equation with time-dependent rate constant of the form k(t) Btsup(α-1), O < α <= 1. (author)

[en] The transient transport problem of an isolated ion pair in the presence of an external electric field has been analyzed by solving numerically a modified version of Smoluchowski's equation. Computations were performed for the case of a delta function initial distribution of electron--cation pairs formed in irradiated cyclohexane for the following strengths: 10, 30, 50, 70, and 100 kV cm^-1. Several useful results were obtained from the analysis, such as the surviving fraction of cation--electron pairs as a function of time and field strength, the asymptotic limits of the yields, and the spatial distribution of ion pairs as a function of their orientation to the direction of the external field. The time it takes to reach 95% of the asymptotic limit of the recombined fraction of the initial ion pairs ranges from 32 to 113 psec for fields ranging from 100 to 10 kV cm^-1, respectively. The asymptotic yields of the survival fraction obtained for all the electric fields are in good agreement with the free ion yields calculated by using Onsager's solution of the steady-state problem

[en] The physico-chemical processes occurring in the particle (ion, electron, photon) bombardment of a surface are reviewed, with particular emphasis on the ion beam-solid interaction. The main factors influencing the chemical reactions which occur by ion bombardment will be discussed in terms of Lindhard-Scharff-Schiott (LSS) theory on the basis of experimental data obtained on both organic and inorganic simple systems as well as on polymers. Some typical reaction schemes will be reported and the modification of the physical properties of the bombarded surface will be shown to be connected with the chemical nature of the products formed as a consequence of the energy deposition of the ion beam. A few examples showing the importance of the above phenomena in the field of surface and interface analysis will be given. (Author)