Predominance of Knockout Reactions at High Energy in Collisions of X + H₂ (X = O(³P), F, Cl, T, and H)

Abstract

Quasiclassical trajectory studies have been carried out for the reactions of O( 3 P), F, Cl, T, and H with H 2 over a wide range of relative collision energy. For all five systems at low energy the projectile reacts only with the H atom it hits first (direct reaction), but at high energy the major product channel is the knockout reaction, where the atom hits one H atom but then goes on to react with the other one. This behavior is consistent with the direct interaction with product repulsion model and is attributed to a common feature of the potential energy surfaces, namely, a strong repulsion between the two H atoms after the system makes the rapid transition between the reactant and product regions of the surface. Evidence for the importance of knockout reactions at high energy is also seen in the angular distribution of the products, particularly in the persistence of product molecules scattered into the backward hemisphere.

Electromagnetic and Microwave Absorption of Nanocrystalline Alloy Fe_0.2(Co_0.2Ni_0.8)_0.8 and Nanocomposite SrFe₁₂O₁₉/Ni_0.5Zn_0.5Fe₂O₄ Microfibers

“…The magnetic nanocrystalline alloy Fe 0.2 (Co 0.2 Ni 0.8 ) 0.8 and nanocomposite SrFe 12 O 19 / Ni 0.5 Zn 0.5 Fe 2 O 4 microfibers were prepared by the citrate gel transformation and reduction process, which was similar to our previous works [9][10]. The crystalline structure of samples was examined by X-ray diffraction (XRD) on a Rigaku D/Mmax2500PC diffractometer using Cu Kα radiation.…”

Manganese Oxide Nanoparticles: An Insight into Structure, Synthesis and Applications

“…MnO 2 nanorods were thermally decomposed over a range of 700 °C to 1000 °C. Decomposition of MnO 2 nanorods to Mn 3 O 4 directly above 1000 °C when urchin-like particle size reached micron level size [54].…”

Magnetic Properties of Aligned Co2Z Hexagonal Z‐Ferrite Fibers

“…24 Magnetic maghemite (c-Fe 2 O 3 ) solid fibers, hollow fibers, fiber-in tube, and tube-in-tube nanostructures (<500 nm diameter) have been produced by electrospinning and annealing at 500°C per 2 h. 25 Song et al published a series of articles in 2010 detailing the preparation of M ferrite hollow fibers drawn from a citrate gel to produce fibers of 1-4 lm diameter, and up to 10 cm length. [26][27][28] No-one else has reported fibers of the more complex hexaplana ferrites. In this study, we report and compare the magnetic properties of aligned ferroxplana Co 2 Z hexaferrite fibers made by the author.…”