Evgenii B Gordon
Russian Academy of Sciences
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Featured researches published by Evgenii B Gordon.
Chemical Physics Letters | 1978
Evgenii B Gordon; B.I. Ivanov; A.P. Perminov; V.E. Balalaev; A.N. Ponomarev; V.V. Filatov
Abstract Rate constants of hydrogen atom exchange with vibrationally excited (ν=1) H 2 , HD and D 2 have been measured. It is established that the main contribution to H + H 2 (ν = 1) and H + HD(ν = 1) reactions at temperatures of 300 K and higher is made by thermoneutral (resonance) channels of exchange. A general scheme for such reactions is proposed.
Journal of Experimental and Theoretical Physics | 2011
Evgenii B Gordon; A. V. Karabulin; V. I. Matyushenko; V. D. Sizov; I. I. Khodos
It is shown that metallic nanowires (5–8 nm in diameter) that form during laser ablation of Ni, Pb, In, and Sn targets embedded in HeII contain extended single-crystal segments, while spherical clusters (about 2 μm in diameter) that form under these conditions have a regular shape and an atomically smooth surface. Such structures are explained by melting of metal ablation products under their coalescence in HeII. The short-term action of a low-intensity beam of electrons with an energy of 200 keV initiates the explosion in metallic spheres preserved in the vacuum chamber of a transmission electron microscope, which is accompanied with the formation of thousands of clusters with a diameter of a few nanometers. This effect is due to metastability of internal mechanical stresses produced upon sharp cooling of molten spheres by liquid helium. A mechanism of condensation of atoms and nanoparticles in quantized vortices of superfluid helium is proposed.
Low Temperature Physics | 2010
Evgenii B Gordon; A. V. Karabulin; V. I. Matyushenko; V. D. Sizov; I. I. Khodos
Laser ablation of metals in superfluid helium has been used to obtain nickel, indium, and lead nanowire bundles. Wires 5–8nm in diameter demonstrate metallic conductivity and are coupled with one another by point contacts. It is shown that the wire bundles attach to sharp tips introduced into the region of condensation and are up to 1cm long. The high intensity and low threshold of electron field emission are explained by the smallness of the radius of individual wires and the long length of a bundle. The superconducting transition temperature is shifted downwards by 2.9K in lead nanowires and upwards by more than 1K in indium nanowires.
Chemical Physics Letters | 1994
Evgenii B Gordon; V.V. Khmelenko; O.S. Rzhevsky
Abstract The peculiarities of electron drift in condensed rare gases in high electric fields can be explained in terms of electron energy losses in inelastic collisions accompanied by the electronic excitation of rare gas atoms. This effect may be useful in creating an excimer laser with condensed rare gases.
Chemical Physics Letters | 1982
Evgenii B Gordon; A.I. Nadkhin; S.A. Sotnichenko; I.A. Boriev
Abstract The small laser pulse gain method, based on photochemical Br and I lasers, is used to probe 2 P 3/2 and 2 P 1/2 states of iodine and bromine atoms in the reactions F + Br 2 → BrF + Br (I), I( 2 P 1/2 ) + Br 2 → IBr + Br (II), and Br + IBr → Br 2 + I (III). The results obtained are capable of formulating a conservation rule for the spin-orbit excited state.
High Energy Chemistry | 2014
Evgenii B Gordon; Alexander V. Karabulin; V. I. Matyushenko; V. D. Sizov; I. I. Khodos
It has been shown that micrometer-sized balls, resulting from the condensation of products of laser ablation of fusible metals in both superfluid helium and water, are in the state of strong internal tension counterbalanced by external compression. By radiation-induced or chemical damage to the integrity of their surface, they break up, ejecting a plurality of nanoparticles. The empty shells of the microspheres, which nonetheless remain intact, are identical to the “hollow spheres” of unclear origin that have been observed previously under laser ablation in usual liquids. The metastability of the microparticles produced by ablation in a liquid should be taken into consideration in their use in engineering and medicine.
Chemical Physics Letters | 1995
Evgenii B Gordon; V. G. Egorov; S. E. Nalivaiko; V. S. Pavlenko; O.S. Rzhevsky
Abstract The spectrum of excitation into the XeCl(B) state is simulated by a procedure rigorously taking into account the bound-bound (bb) and free-bound (fb) transition contributions. The cross-sections for bb-absorption and photoassociation are calculated, and at their maxima, near λ = 308 nm, they amount to 1.2 × 10−16 cm2 and 1.4 × 10−38 cm5, respectively. An experimental approach is developed enabling the distinguishing of fb-transition contributions by monitoring the excitation into the XeCl(B) state in conditions when the equilibrium between nonexcited XeCl(X) molecules and free Xe and Cl atoms does not have time to be completed. The experimentally obtained ratio of intensities for the bb- and fb-transitions, amounting to 1.8–3.3, is in good agreement with the calculations. These experiments enabled estimation of the rate constant for XeCl(X) state dissociation in bimolecular collisions with Xe atoms as being (3–6) × 10−11 cm3 s−1.
Chemical Physics Letters | 1985
I.A. Boriev; Evgenii B Gordon; A.A. Efimenko
The total rate constant for the reaction H + IBr → HI + Br*(Br), HBr + I* (1). (1.5±0.04)×10−10 cm3/s has been obtained at room temperature. The reaction path leading to bromine-atom formation was found to be predominant (≈90%). Our results together with data on the rate constants for the H-atom reactions with halogen and interhalogen (two branches) molecules, show that the rate constants to such reactions are determined exclusively by H-atom interaction with the attacked halogen atom and are nearly independent of the other halogen in the molecule. The rate constants for the Br*(2Psol12 collisional deactivation by H2S and CF3Br have been measured as (6.2±1.6)×10−13 cm3/s, respectively.
High Energy Chemistry | 2017
Evgenii B Gordon; Alexander V. Karabulin; S. A. Krasnokutski; V. I. Matyushenko; I. I. Khodos
As in the case of metals, laser ablation of germanium and silicon in superfluid helium leads to the formation of thin nanowires; spherical nanoclusters are also present in ablation products. A decrease in the resistance of bundles of silicon nanowires with increasing temperature is typical of semiconductors. Laser ablation of amorphous graphite also leads to the formation of quasi-one-dimensional structures, but there are no spherical clusters among the coagulation products. The structure of carbon filaments is amorphous; they contain onion-like entities, and nanodiamonds appear as coagulation products when the concentration of carbon introduced into superfluid helium increases. The peculiar behavior of carbon is associated with the impossibility of its melting at low pressures.
Chemical Physics Letters | 1979
Evgenii B Gordon; A.I. Nadkhin; S.A. Sotnichenko
Abstract Deactivation rate constants of spin-orbital excited Br atoms in the reactions Br(2P 1 2 ) + O2 → Br(2P 3 2 ) + O2 (k1), and Br(2P 1 2 ) + NO → Br(2P 3 2 ) + NO (k4) have been measured with a photodissociative IBr laser on the electronic transition 2P 1 2 −2P 3 2 in the Br atom (λ = 2.7 μm). The values obtained are (6.4 ± 1.8) × 10−14 cm3 s−1 and (1.9 ± 0.6) × 10−12 cm3 s−1, respectively. Comparison with published data leads to the conclusion that, contrary to a widely accepted point of view, the high rate constants for the quenching of excited halogen atoms are due to resonant energy transfer processes and not to the paramagnetic nature of the quencher.