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碰撞能对H+CH+→C++H2反应立体动力学性质的影响

唐晓平 周灿华 和小虎 于东麒 杨阳

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碰撞能对H+CH+→C++H2反应立体动力学性质的影响

唐晓平, 周灿华, 和小虎, 于东麒, 杨阳

Influence of collision energy on the stereodynamics of the H+CH+→C++H2 reaction

Tang Xiao-Ping, Zhou Can-Hua, He Xiao-Hu, Yu Dong-Qi, Yang Yang
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  • 采用准经典轨线法计算H(2S)+CH+(X1Σ+)→C+(2P)+H2(X1ΣM=g+)反应在其基电子态势能面上的不同碰撞能时的反应截面和立体动力学性质.此外还计算了极化依赖的微分反应截面(2π/σ)(dσ00/dωt)和(2π/σ)(dσ20/dωt).结果表明该反应受到反应物碰撞能影响较大.
    The reactive cross section and stereodynamics at selected collision energies for the H(2S)+CH+(X1Σ+)→C+(2P)+H2(X1Σg+) reaction on a globally smooth ab initio potential surface of the 2A' state are calculated in detail by the quasi-classical trajectory(QCT) method. The calculated cross section decreases with the increase of the collision energy, which is found to be in overall good agreement with the previous time-dependent quantum results in the high collision energy regime (Ec>20 meV). The discrepancy between the QCT and previous quantum cross section below 20 meV can be attributed to the limitations of the classical trajectory method, because the QCT method cannot handle the effect of zero point energy. In general, QCT results show qualitative agreement with the quantum results, which confirmsthe validity of the QCT method. The research shows that the product rotational angular momentum vector is aligned and oriented. The alignment of the product rotational angular momentum vector j' depends very sensitively on the collision energy. With the increase of the collision energy, the alignment effect recedesin the low collision energy region (1500 meV), while it is enhanced in the high collision energy region (500-1000 meV). Moreover, the k-k'-j' distributions tend to be asymmetric with respect to the k-k' scattering plane (or about φr=180°), with two peaks appearing at φr=90° and φr=270°, respectively. This indicates that the product rotational angular momentum is not only in the Y-axis direction but also along the positive Y-axis direction. The peak intensity decreases with the collision energy increasing from 1 meV to 100 meV, while it increases with collision energy increasing from 100 meV to 1000 meV. Therefore the Y-axis orientation effect turns weak with the enhancement of the collision energy in the low energy region, while it becomes strong in the high energy region. In addition, the polarization dependent differential cross sections (PDDCSs) (2π/σ)(dσ00/dωt) and (2π/σ)(dσ20/dωt) are calculated. PDDCS (2π/σ)(dσ00/dωt) results indicate that the products have almost symmetrically scattered forward and backward, and the intensity of the scattering increases with the increase of the collision energy. The PDDCS (2π/σ)(dσ20/dωt) shows that the alignment effect of the rotational angular momentum of the products is stronger at the terminal of the scattering angle than at the other directions.
      通信作者: 和小虎, hxh@dicp.ac.cn;useeu@163.com ; 于东麒, hxh@dicp.ac.cn;useeu@163.com
    • 基金项目: 国家自然科学基金(批准号:21403226,21503226)资助的课题.
      Corresponding author: He Xiao-Hu, hxh@dicp.ac.cn;useeu@163.com ; Yu Dong-Qi, hxh@dicp.ac.cn;useeu@163.com
    • Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 21403226, 21503226).
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    Herráez-Aguilar D, Jambrina P, Menéndez M, Aldegunde J, Warmbier R, Aoiz F 2014 Phys. Chem. Chem. Phys. 16 24800

    [12]

    Bonfanti M, Tantardini G F, Martinazzo R 2014 J. Chem. Phys. A 118 6595

    [13]

    Li Y Q, Zhang P Y, Han K L 2015 J. Chem. Phys. 142 124302

    [14]

    Werfelli G, Halvick P, Honvault P, Kerkeni B, Stoecklin T 2015 J. Chem. Phys. 143 114304

    [15]

    Grozdanov T, McCarroll R 2013 Chem. Phys. Lett. 575 23

    [16]

    Chen M D, Han K L, Lou N Q 2003 J. Chem. Phys. 118 4463

    [17]

    Aoiz F, Brouard M, Enriquez P 1996 J. Chem. Phys. 105 4964

    [18]

    Wu V W K 2011 Phys. Chem. Chem. Phys. 13 9407

    [19]

    Balakrishnan A, Smith V, Stoicheff B 1992 Phys. Rev. Lett. 68 2149

    [20]

    Han K L, He G Z, Lou N Q 1998 Chin. J. Chem. Phys. 11 525 (in Chinese)[韩克利, 何国忠, 楼南泉1998化学物理学报11 525]

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    Kong H, Liu X G, Xu W W, Zhang Q G 2009 Acta Phys.-Chim. Sin. 25 935 (in Chinese)[孔浩, 刘新国, 许文武, 张庆刚2009物理化学学报25 935]

  • [1]

    Langer W 1978 Astrophys. J. 225 860

    [2]

    Draine B T 1986 Astrophys. J. 310 408

    [3]

    Zanchet A, Godard B, Bulut N, Roncero O, Halvick P, Cernicharo J 2013 Astrophys. J. 766 80

    [4]

    Lique F, Werfelli G, Halvick P, Stoecklin T, Faure A, Wiesenfeld L, Dagdigian P J 2013 J. Chem. Phys. 138 204314

    [5]

    Ervin K M, Armentrout P B 1986 J. Chem. Phys. 84 6738

    [6]

    Stoecklin T, Halvick P 2005 Phys. Chem. Chem. Phys. 7 2446

    [7]

    Halvick P, Stoecklin T, Larrégaray P, Bonnet L 2007 Phys. Chem. Chem. Phys. 9 582

    [8]

    Plasil R, Mehner T, Dohnal P, Kotrik T, Glosik J, Gerlich D 2011 Astrophys. J. 737 60

    [9]

    Gerlich D, Disch R, Scherbarth S 1987 J. Chem. Phys. 87 350

    [10]

    Warmbier R, Schneider R 2011 Phys. Chem. Chem. Phys. 13 10285

    [11]

    Herráez-Aguilar D, Jambrina P, Menéndez M, Aldegunde J, Warmbier R, Aoiz F 2014 Phys. Chem. Chem. Phys. 16 24800

    [12]

    Bonfanti M, Tantardini G F, Martinazzo R 2014 J. Chem. Phys. A 118 6595

    [13]

    Li Y Q, Zhang P Y, Han K L 2015 J. Chem. Phys. 142 124302

    [14]

    Werfelli G, Halvick P, Honvault P, Kerkeni B, Stoecklin T 2015 J. Chem. Phys. 143 114304

    [15]

    Grozdanov T, McCarroll R 2013 Chem. Phys. Lett. 575 23

    [16]

    Chen M D, Han K L, Lou N Q 2003 J. Chem. Phys. 118 4463

    [17]

    Aoiz F, Brouard M, Enriquez P 1996 J. Chem. Phys. 105 4964

    [18]

    Wu V W K 2011 Phys. Chem. Chem. Phys. 13 9407

    [19]

    Balakrishnan A, Smith V, Stoicheff B 1992 Phys. Rev. Lett. 68 2149

    [20]

    Han K L, He G Z, Lou N Q 1998 Chin. J. Chem. Phys. 11 525 (in Chinese)[韩克利, 何国忠, 楼南泉1998化学物理学报11 525]

    [21]

    Kong H, Liu X G, Xu W W, Zhang Q G 2009 Acta Phys.-Chim. Sin. 25 935 (in Chinese)[孔浩, 刘新国, 许文武, 张庆刚2009物理化学学报25 935]

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出版历程
  • 收稿日期:  2016-08-23
  • 修回日期:  2016-10-31
  • 刊出日期:  2017-01-20

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