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  • AIP Publishing  (19)
  • Asia - CrossAsia  (19)
  • 1
    Online Resource
    Online Resource
    Application of laser dispersion method in apparatus combining H atom Rydberg tagging time-of-flight technique with vacuum ultraviolet free electron laser
    AIP Publishing ; 2020
    In:  Chinese Journal of Chemical Physics Vol. 33, No. 2 ( 2020-04-01), p. 139-144
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 33, No. 2 ( 2020-04-01), p. 139-144
    Abstract: Photodissociation of H2S in the VUV region plays an important role in the atmospheric chemistry and interstellar chemistry. To date, however, few studies have been focused on this topic. In this article, we have described a laser dispersion method applied in the apparatus combining the high-n H atom Rydberg tagging time-of-flight technique with the vacuum ultraviolet free electron laser (VUV FEL). The Lyman-α laser beam (121.6 nm) used in the H-atom detection was generated by the difference frequency four-wave mixing schemes in a Kr/Ar gas cell. After passing through an off-axis biconvex LiF lens, the 121.6 nm beam was dispersed from the 212.6 nm and 845 nm beams due to the different deflection angles experienced by these laser beams at the surfaces of the biconvex lens. This method can eliminate the background signal from the 212.6 nm photolysis. Combined with the VUV FEL, photodissociation of H2S at 122.95 nm was studied successfully. The TOF spectrum was measured and the derived total kinetic energy release spectrum was displayed. The results suggest that the experimental setup is a powerful tool for investigating photodissociation dynamics of molecules in the VUV region which involves the H-atom elimination processes.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp2001008
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
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  • 2
    Online Resource
    Online Resource
    Direct Synthesis of Phenol from Benzene on an Activated Carbon Catalyst Treated with Nitric Acid
    AIP Publishing ; 2011
    In:  Chinese Journal of Chemical Physics Vol. 24, No. 3 ( 2011-06-01), p. 358-364
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 24, No. 3 ( 2011-06-01), p. 358-364
    Abstract: Commercially available coal-based activated carbon was treated by nitric acid with different concentrations and the resultant samples were used as catalysts for the direct hydroxylation of benzene to phenol in acetonitrile. Boehm titration, X-ray photoelectron spectroscopy, scanning electron microscope coupled with an energy dispersive X-ray microanalyzer, and Brunauer-Emmett-Teller method were used to characterize the samples. The number of carboxyl groups on the surface was found to be the main factor affecting the catalytic activity. An optimum catalytic performance with a yield of 15.7% and a selectivity of 87.2% to phenol was obtained.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/24/03/358-364
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
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  • 3
    Online Resource
    Online Resource
    Dynamic Theory of Die Swell for Entangled Polymeric Liquids in Tube Extrusions: New Set of Equations for the Growth and Ultimate Extrudate Swelling Ratios under the Free States
    AIP Publishing ; 2007
    In:  Chinese Journal of Chemical Physics Vol. 20, No. 5 ( 2007-10-01), p. 563-581
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 20, No. 5 ( 2007-10-01), p. 563-581
    Abstract: A new dynamic theory of die swell for entangled polymeric liquids in a steady simple shear flow is proposed which can be used to predict the correlation of the time-dependent and time-independent extrudate swelling behaviors to the molecular parameters of polymers and the operational variables. The theory is based on the O-W-F constitutive equation and the free recovery from Poioeuille flow with different ratios. Experiments show that the magnitudes of the simple shear in the steady simple shear flow may be resolved into the free recoil resulting from the recoverable elastic strains and the viscous heating resulting from the unrecoverable viscoelastic strains. For distinguishing the recoil from the viscous heating, a partition function and two exponential fractions of conformation for the recoil and the viscous heating were defined. Thus the instantaneous, delayed and ultimate recoverable strain, and recoil in the free recovery were correlated to the partition function, the fraction of recoverable conformation, the molecular parameters, and the operational variables. Also the dynamics of the growth equation on the delayed viscoelastic strain and the delayed recoil in free state were deduced. After introducing the condition of uniform two dimensional extensions, the definition of swell ratio and the operational variables into the above correlation expressions and growth equations, then the correlations of the delayed extrudate swelling effect and the ultimate extrudate swelling effects to the molecular parameters and the operational variables were derived. Finally, two new sets of equations on the growth variables and ultimate extrudate swelling ratios under the dynamic and equilibrium states were also deduced from this dynamic theory of die swell. The first set of equations on the ultimate extrudate swelling ratio under the free and equilibrium states was verified by HDPE experimental data at two temperatures and different operational variables. The second set of equations on the growth extrudate swelling ratios under free and dynamic states was verified by PBD experimental data with different molecular weights and different operational variables. An excellent agreement is obtained, which shows that the two sets of equations for the growth and ultimate extrudate swelling ratios can be used directly to predict the correlation of extrudate swelling ratios to the molecular parameters and the operational variables.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/20/05/563-581
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
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  • 4
    Online Resource
    Online Resource
    Dynamic Theory of Die Swell for Entangled Polymeric Liquids in Tube Extrusion: Correlations of Total and Ultimate Extrudate Swell Effects to Growth Time, Shear Stress and Aspect Ratio Under the Free States
    AIP Publishing ; 2008
    In:  Chinese Journal of Chemical Physics Vol. 21, No. 1 ( 2008-02-01), p. 55-68
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 21, No. 1 ( 2008-02-01), p. 55-68
    Abstract: The dynamic theory of die swell deduced in a previous paper was extensively applied to study the extrudate swelling behaviors of two entangled polymeric liquids (HDPE and PBD) in a simple shear flow at steady shear stress. The mechanism and dynamics for the recoils and the recoveries of viscoelastic strains in the extrudate were investigated under the free recovery and dynamic states. It was found that in the course of recovery the free recoil and the growth of die swell in the extrudate may be divided into two recovery regions (instantaneous and delayed regions) and three growth stages (instantaneous, delayed, and ultimate extrudate swelling stages). The free recoil and the extrudate swelling behaviors may be expressed as a function of shear stress. The correlations of instantaneous, delayed, total and ultimate extrudate swell effects to the molecular parameters and the operational variables in the simple shear flow at steady shear stress were derived from the dynamic theory of die swell. Also, two sets of new universal equations on the total extrudate swelling effect (TESE) and ultimate extrudate swelling effect (UESE) were deduced. The first is the universal equation of the logarithmic correlation between the TESE and the growth time under the free and dynamic states; the second is the universal equation of the logarithmic correlation between the UESE and the operational variables under the free and equilibrium states. The first equation was verified by experimental data of PBD with different molecular weights at different operational variables. The second equation was verified by experimental data of HDPE at two temperatures and different operational variables. An excellent agreement result was obtained. The excellent agreement shows that the two universal equations can be used directly to predict the correlations of the TESE and UESE to the growth time, the molecular parameters, and the operational variables under the dynamic and equilibrium states.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/21/01/55-68
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
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  • 5
    Online Resource
    Online Resource
    Photodissociation dynamics of CS2 near 204 nm: The S(3P J )+CS( X 1Σ+) channels
    AIP Publishing ; 2021
    In:  Chinese Journal of Chemical Physics Vol. 34, No. 1 ( 2021-02-01), p. 95-101
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 34, No. 1 ( 2021-02-01), p. 95-101
    Abstract: We study the photodissociation dynamics of CS2 in the ultraviolet region using the time-sliced velocity map ion imaging technique. The S(3PJ)+CS(X1Σ+) product channels were observed and identified at four wavelengths of 201.36, 203.10, 204.85 and 206.61 nm. In the measured images of S(3PJ=2,1,0), the vibrational states of the CS(X1Σ+) co-products were partially resolved and the vibrational state distributions were determined. Moreover, the product total kinetic energy releases and the anisotropic parameters were derived. The relatively small anisotropic parameter values indicate that the S(3PJ=2,1,0)+CS(X1Σ+) channels are very likely formed via the indirect predissociation process of CS2. The study of the S(3PJ=2,1,0)+CS(X1Σ+) channels, which come from the spin-orbit coupling dissociation process of CS2, shows that nonadiabatic process plays a role in the ultraviolet photodissociation of CS2.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp2010183
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
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  • 6
    Online Resource
    Online Resource
    Synthesis and Tribological Properties of Tubular NbS2 and TaS2 Nanostructures
    AIP Publishing ; 2007
    In:  Chinese Journal of Chemical Physics Vol. 20, No. 6 ( 2007-12-01), p. 768-772
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 20, No. 6 ( 2007-12-01), p. 768-772
    Abstract: NbS2 and TaS2 nanostubes were prepared via solid state reaction method, and their tribological properties were studied over a wide range of normal loads and sliding velocities. The size distributions and shapes of sulfides were characterized using transmission electron microscopy and scanning electron microscopy. The results indicated that the NbS2 and TaS2 compounds had tubular structures with the mean diameter of 100 nm and length of 10 mm. The effect of NbS2 and TaS2 nanotubes added in commercial lubricating oil T40, was initially studied using the instrument MS-T3000. The results showed that the antiwear ability of NbS2 and TaS2 as additives was obviously better than that of the normal lubricating oil in ambient conditions. The general frictional properties of the solid lubricant containing TaS2 is better than those of the solid lubricant containing NbS2. The frictional mechanism was discussed.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/20/06/768-772
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
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  • 7
    Online Resource
    Online Resource
    Production of Benzoic Acid through Catalytic Transformation of Renewable Lignocellulosic Biomass
    AIP Publishing ; 2017
    In:  Chinese Journal of Chemical Physics Vol. 30, No. 5 ( 2017-10-27), p. 588-594
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 30, No. 5 ( 2017-10-27), p. 588-594
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/30/cjcp1703047
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
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  • 8
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    Online Resource
    High resolution crossed molecular beams study of the H+HD→H2+D reaction
    AIP Publishing ; 2019
    In:  Chinese Journal of Chemical Physics Vol. 32, No. 1 ( 2019-02-01), p. 123-128
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 32, No. 1 ( 2019-02-01), p. 123-128
    Abstract: The H+H2 reaction is the simplest chemical reaction system and has long been the prototype model in the study of reaction dynamics. Here we report a high resolution experimental investigation of the state-to-state reaction dynamics in the H+HD→H2+D reaction by using the crossed molecular beams method and velocity map ion imaging technique at the collision energy of 1.17 eV. D atom products in this reaction were probed by the near threshold 1+1′ (vacuum ultraviolet+ultraviolet) laser ionization scheme. The ion image with both high angular and energy resolution were acquired. State-to-state differential cross sections was accurately derived. Fast forward scattering oscillations, relating with interference effects in the scattering process, were clearly observed for H2 products at H2(v′=0, j′=1) and H2(v′=0, j′=3) rovibrational levels. This study further demonstrates the importance of measuring high-resolution differential cross sections in the study of state-to-state reaction dynamics in the gas phase.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp1901010
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
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  • 9
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    Online Resource
    Cavity-enhanced saturation spectroscopy of molecules with sub-kHz accuracy
    AIP Publishing ; 2019
    In:  Chinese Journal of Chemical Physics Vol. 32, No. 1 ( 2019-02-01), p. 107-112
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 32, No. 1 ( 2019-02-01), p. 107-112
    Abstract: Saturation spectroscopy is frequently used to obtain sub-Doppler measurement of atomic and molecular transitions. Optical resonant cavities can be used to enhance the effective absorption path length, and the laser power inside the cavity as well to saturate very weak ro-vibrational transitions of molecules. Three different cavity-enhanced methods, cavity enhanced absorption spectroscopy, cavity ring-down spectroscopy, and noise-immune cavity enhanced optical heterodyne molecular spectroscopy (NICE-OHMS), were compared by measuring the Lamb dip of a C2H2 line at 1.4 µm using a cavity with a finesse of 120000. The center of the line was determined by different cavity-enhanced methods, each giving a sub-kHz (δν/ν≈10−12) statistical uncertainty. The sensitivity and precision of different methods were analyzed and compared. As demonstrated in this study, the NICE-OHMS method is the most sensitive one, but more investigation on the systematic uncertainty is necessary before its application in metrology studies toward a sub-kHz accuracy.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp1812272
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
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  • 10
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    Online Resource
    Growth of High Magnetic α-Fe2O3 and Fe3O4 Nanowires via an Oxide Assisted Vapor-Solid Process
    AIP Publishing ; 2011
    In:  Chinese Journal of Chemical Physics Vol. 24, No. 1 ( 2011-02-01), p. 109-114
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 24, No. 1 ( 2011-02-01), p. 109-114
    Abstract: We describes a controllable synthesis procedure for growing α-Fe2O3 and Fe3O4 nanowires. High magnetic hematite α-Fe2O3 nanowires are successfully grown on Fe0.5Ni0.5 alloy substrates via an oxide assisted vapor-solid process. Experimental results also indicate that previous immersion of the substrates in a solution of oxalic acid causes the grown nanowires to convert gradually into magnetite (Fe3O4) nanowires. Additionally, the saturated state of Fe3O4 nanowires is achieved as the oxalic acid concentration reaches 0.75 mol/L. The average diameter and length of nanowires expands with an increasing operation temperature and the growth density of nanowires accumulates with an increasing gas flux in the vapor-solid process. The growth mechanism of α-Fe2O3 and Fe3O4 nanowires is also discussed. The results demonstrate that the entire synthesis of nanowires can be completed within 2 h.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/24/01/109-114
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 2381472-X
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