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  • AIP Publishing  (20)
  • Asia - CrossAsia  (20)
  • 1
    Online Resource
    Online Resource
    Photodissociation of HOD via the C̃ 1B1 State: OD/OH Branching Ratio and OD Bond Dissociation Energy
    AIP Publishing ; 2011
    In:  Chinese Journal of Chemical Physics Vol. 24, No. 2 ( 2011-04-01), p. 129-133
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 24, No. 2 ( 2011-04-01), p. 129-133
    Abstract: Photodissociation of jet-cooled HOD via the C̃ state around 124 nm has been studied using the H(D)-atom Rydberg tagging time-of-flight technique. Rotational state resolved action spectrum and the product translational energy distribution spectra have been recorded for both D+OH and H+OD dissociation channels. Product channel OH/OD branching ratios for the individual C̃-X̃ rotational transition have been determined. A comparison is also given with the B̃-X̃ and Ã-X̃ transitions. In addition, the dissociation energy of the OD bond in HOD has been determined accurately to be 41751.3±5 cm−1.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/24/02/129-133
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
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  • 2
    Online Resource
    Online Resource
    Miniature Boat Fabrication with Striking Loading Capacity in Seawater from Hydrophobic Steel Mesh
    AIP Publishing ; 2015
    In:  Chinese Journal of Chemical Physics Vol. 28, No. 6 ( 2015-12-27), p. 762-766
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 28, No. 6 ( 2015-12-27), p. 762-766
    Abstract: A superhydrophobic steel mesh film was prepared by combination of macro-scale rough surface and low surface energy material treatment through a facile coating method. The contact angle for seawater is measured to be as high as 130.16°. A reformed Cassie-Baxter equation was applied for the theoretical predictions of this novel material for the first time. Good agreement between the predictions and experiments was obtained. The loading capacities of these boats, fabricated from the resulting hydrophobic steel meshes, were also characterized. The highest loading weight about 17.50 g was obtained by the steel mesh treated by 2.0wt% (heptadecafluoro-1,1,2,2,-tetradecyl)trimethoxysilane solution. The striking loading capacity of this miniature boat may be attributed to the air film trapped around the mesh surface. This novel superhydrophobic steel mesh material have wide applications on medical materials, marine materials and smart materials.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/28/cjcp1503030
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
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  • 3
    Online Resource
    Online Resource
    Vibrational Spectra of Nonrigid Molecule HCP in an Algebraic Model
    AIP Publishing ; 2006
    In:  Chinese Journal of Chemical Physics Vol. 19, No. 6 ( 2006-12-01), p. 478-480
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 19, No. 6 ( 2006-12-01), p. 478-480
    Abstract: An algebraic Hamiltonian for the two coupled nonlinear vibrations of highly excited nonrigid molecule HCP was presented. The Hamiltonian reduces to the conventional one in a limit which was expressed in terms of harmonic oscillator operators. It showed that the algebraic model can better reproduce the data than the conventional model by fitting the observed data of HCP.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1360/cjcp2006.19(6).478.3
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
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  • 4
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    Online Resource
    Influence of molecular stacking pattern on excited state dynamics of copper phthalocyanine films
    AIP Publishing ; 2022
    In:  Chinese Journal of Chemical Physics Vol. 35, No. 6 ( 2022-12-01), p. 900-906
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 35, No. 6 ( 2022-12-01), p. 900-906
    Abstract: Photophysical processes occurring within organic semiconductors is important for designing and fabricating organic solar cells. Copper phthalocyanine (CuPc) is a typical electron acceptor. In this work, the triplet exciton lifetime is prolonged by altering the molecular stacking pattern of the CuPc film. For CuPc thin films, the excited state decays are mainly determined by the triplet-triplet annihilation process. The ultrafast transient absorption measurements indicate that the primary annihilation mechanism is one-dimensional exciton diffusion collision destruction. The decay kinetics show a clearly time-dependent annihilation rate constant with γ∝t−1/2. Annihilation rate constants are determined to be γ0 = (2.87±0.02)×10−20 cm3·s−1/2 and (1.42±0.02)×10−20 cm3·s−1/2 for upright and lying-down configurations, respectively. Compared to the CuPc thin film with an upright configuration, the thin film with a lying-down configuration shows longer exciton lifetime and higher absorbance, which are beneficial to organic solar cells. The results in this work have important implications on the design and mechanistic understanding of organic optoelectronic devices.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp2103052
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
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  • 5
    Online Resource
    Online Resource
    Detection of radiocarbon dioxide with double-resonance absorption spectroscopy
    AIP Publishing ; 2021
    In:  Chinese Journal of Chemical Physics Vol. 34, No. 4 ( 2021-08-01), p. 373-380
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 34, No. 4 ( 2021-08-01), p. 373-380
    Abstract: Fast and accurate quantitative detection of 14CO2 has important applications in many fields. The optical detection method based on the sensitive cavity ring-down spectroscopy technology has great potential. But currently it has difficulties of insufficient sensitivity and susceptibility to absorption of other isotopes/impurity molecules. We propose a stepped double-resonance spectroscopy method to excite 14CO2 molecules to an intermediate vibrationally excited state, and use cavity ringdown spectroscopy to probe them. The two-photon process significantly improves the selectivity of detection. We derive the quantitative measurement capability of double-resonance absorption spectroscopy. The simulation results show that the double-resonance spectroscopy measurement is Doppler-free, thereby reducing the effect of other molecular absorption. It is expected that this method can achieve high-selectivity detection of 14CO2 at the sub-ppt level.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp2103045
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
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  • 6
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    Online Resource
    Effect of Hydrogen Addition on Methane HCCI Engine Ignition Timing and Emissions Using a Multi-zone Model
    AIP Publishing ; 2009
    In:  Chinese Journal of Chemical Physics Vol. 22, No. 3 ( 2009-06-01), p. 290-296
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 22, No. 3 ( 2009-06-01), p. 290-296
    Abstract: Ignition timing control is of great importance in homogeneous charge compression ignition engines. The effect of hydrogen addition on methane combustion was investigated using a CHEMKIN multi-zone model. Results show that hydrogen addition advances ignition timing and enhances peak pressure and temperature. A brief analysis of chemical kinetics of methane blending hydrogen is also performed in order to investigate the scope of its application, and the analysis suggests that OH radical plays an important role in the oxidation. Hydrogen addition increases NOx while decreasing HC and CO emissions. Exhaust gas recirculation (EGR) also advances ignition timing; however, its effects on emissions are generally the opposite. By adjusting the hydrogen addition and EGR rate, the ignition timing can be regulated with a low emission level. Investigation into zones suggests that NOx is mostly formed in core zones while HC and CO mostly originate in the crevice and the quench layer.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/22/03/290-296
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
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  • 7
    Online Resource
    Online Resource
    Preparation and Performances of RuO2/TiO2 Films Photocatalyst Supported on Float Pearls
    AIP Publishing ; 2007
    In:  Chinese Journal of Chemical Physics Vol. 20, No. 6 ( 2007-12-01), p. 789-795
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 20, No. 6 ( 2007-12-01), p. 789-795
    Abstract: RuO2/TiO2 films were deposited on float pearls (FP) by the sol-gel-dipping method. The substrates were coated with RuO2/TiO2 precursor sol, air-dried at 120C and further heated at 500C to obtain the coupled photocatalyst of RuO2/TiO2 films supported on FP (RuO2/TiO2/FP). The structure of coupled photocatalyst was characterized by SEM, XRD, and FT-IR technique, respectively. The results showed TiO2 has anatase structure and doped RuO2 was highly dispersed on the surface of TiO2 particles as amorphous. The average thickness of RuO2/TiO2 films (3 layers) on FP was determined to be about 1 m. This study was carried out under the following conditions: volume 60 mL, initial concentration of beta-cypermethrin (BEC) 45 mg/L, pH 6.5, amount of RuO2/TiO2/PF 5 g/L, air flow rate 200 mL/min, reaction time 60 min. The degradation rates of BEC are 88.1% (125 W Hg lamp), 82.8% (8 W UV lamp), and 75.1% (8 W solar lamp), respectively. The photocatalytic degradation of BEC was experimentally demonstrated to follow the Langmuir-Hinshelwood kinetic model, and the reaction rate constant (17.5 mg/(L min)) and the adsorption constant (3.486 L/g) were determined, respectively. It was also found that the RuO2/TiO2/FP photocatalyst has significantly the visible light photoactivity for degradation of BEC.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/20/06/789-795
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
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  • 8
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    Online Resource
    Theoretical Study of Isoprene Dissociative Photoionization
    AIP Publishing ; 2017
    In:  Chinese Journal of Chemical Physics Vol. 30, No. 1 ( 2017-02-27), p. 43-49
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 30, No. 1 ( 2017-02-27), p. 43-49
    Abstract: Theoretical calculations have been carried out to investigate the possible dissociation channels of isoprene. We focus on the major fragment ions of C5H7+, C5H5+, C4H5+, C3H6+, C3H5+, C3H4+, C3H3+ and C2H3+, which were observed experimentally from the isoprene dissociative photoionization. The energy calculations were performed with the CBS-QB3 model. All the geometries and energies of the fragments, intermediates and transition states involved in the dissociations channels were determined. Finally, the mechanisms of the dissociation pathways were discussed on the comparison of theoretical and experimental results.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/30/cjcp1606131
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
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  • 9
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    Online Resource
    Photodissociation Dynamics of Methanol and Ethanol at 157 nm
    AIP Publishing ; 2008
    In:  Chinese Journal of Chemical Physics Vol. 21, No. 4 ( 2008-08-01), p. 301-307
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 21, No. 4 ( 2008-08-01), p. 301-307
    Abstract: 157 nm photodissociation of jet-cooled CH3OH and C2H5OH was studied using the high-n Rydberg atom time-of-flight (TOF) technique. TOF spectra of nascent H atom products were measured. Simulation of these spectra reveals three different atomic H loss processes: one from hydroxyl H elimination, one from methyl (ethyl) H elimination, and one from secondary dissociation of the methoxy (ethoxy) radical. The relative branching ratio indicates secondary dissociation of ethoxy is less important than that of methoxy. The average angular anisotropy parameter of methanol is negative (with 0.3), indicating the transition dipole moment is perpendicular to the COH plane. The slightly more negative value of ethanol (with 0.4) implies that ethanol has a longer rotational period. These experimental results indicate that both systems undergo fast internal conversion to the 3s surface after it is excited to the 3px surface, and then dissociate on the 3s surface. The translational energy distribution of the CH3O+H products reveals extensive CH3 rocking or CH3 umbrella excitation in the CH3O radical. However the vibrational structures are not resolved in the C2H5O radical.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/21/04/301-307
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
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  • 10
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    Online Resource
    Adsorption Behavior of CH2 and CH3 on Metal Clusters Cun ( n = 16)
    AIP Publishing ; 2008
    In:  Chinese Journal of Chemical Physics Vol. 21, No. 5 ( 2008-10-01), p. 445-450
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 21, No. 5 ( 2008-10-01), p. 445-450
    Abstract: Using density functional theory with generalized gradient approximation and hybrid functional, we studied the properties of energy, charge population, and vibration of CH2 and CH3 adsorbed on Cun (n = 16) clusters. The results show that the DFT calculation with the hybrid functional matches the experimental results better in both cases. The calculation results indicate that the adsorption of CH2 is stronger than that of CH3. During adsorption, the charges transfer from Cu to CH2 or CH3. The obtained vibrational frequencies for different modes of CH2 and CH3 adsorbed on Cun agree well with the experimental results for the adsorption on Cu(lll) surface.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1088/1674-0068/21/05/445-450
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 2381472-X
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