共查询到17条相似文献,搜索用时 485 毫秒
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多体刚性椭球模型是一种比较精确的描述氦原子与钠分子碰撞的理论模型.本文用多体刚性椭球模型计算了不同能量下He的同位素原子3He,4He,7He,10He与Na2分子碰撞的转动激发积分散射截面,表明增加椭球等势面个数可以得到更准确的转动激发积分散射截面;总结出3He,4He,7He,10He-Na2碰撞体系转动激发积分散射截面随相对入射能量和体系约化质量变化的规律;讨论了相对入射能量为100meV时,相互作用势的不同区域对4He-Na2碰撞体系转动激发积分散射截面的影响情况. 相似文献
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基于作者构造的He-HBr体系的各向异性势,采用密耦方法计算了3He,4He,6He和7He与HBr分子在碰撞能量分别为40和75meV时的微分截面,详细讨论了入射氦同位素对微分截面的影响.结果表明:在相同碰撞能量时,随着同位素氦原子质量的增加,总微分截面在0° 时的角分布逐渐增大,同一级衍射振荡极小值位置逐渐向小散射角方向移动;弹性与总非弹性截面交界角逐渐减小,总非弹性截面逐渐增加.碰撞能量越低,入射同位素He原子的
关键词:
同位素效应
微分截面
各向异性势
He-HBr体系 相似文献
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用密耦方法计算了非对称同位素替代分子与氦原子碰撞(He-HD,HT,DT)转动激发,当入射能量E=0.3 eV时,得到了上述碰撞体系的微分散射截面或角分布.基于上述理论计算,讨论了原子与双原子分子碰撞的同位素效应. 相似文献
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The influence of isotope substitution of neon atom on the integral cross sections of rotational excitation in Ne-Na2 collisions 下载免费PDF全文
This paper applies the multiple ellipsoid model to the 16 Ne (20 Ne,28 Ne,34 Ne)-Na 2 collision systems,and calculates integral cross sections for rotational excitation at the incident energy of 190 meV.It can be seen that the accuracy of the integral cross sections can be improved by increasing the number of equipotential ellipsoid surfaces.Moreover,by analysing the differences of these integral cross sections,it obtains the change rules of the integral cross sections with the increase of rotational angular quantum number J,and with the change of the mass of isotope substitution neon atom.Finally,the contribution of different regions of the potential to inelastic cross sections for 20 Ne-Na 2 collision system is investigated at relative incident energy of 190 meV. 相似文献
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The collisional excitation of the lower vibrational levels of
H2(1Σg+) molecules by low-energy electron impact is
computed using an empirical model potential and by solving the
coupled-channels scattering equations within a space-fixed (SF)
frame of reference formulation. Numerically converged partial,
integral inelastic and elastic cross-sections are obtained from what
is an essentially exact treatment of the dynamics and the results
are compared with measurements and with earlier calculations on the
same system. The usefulness of the SF method for handling excitation
processes at near-threshold collision energies is discussed and
analyzed through the calculations of collisional superelastic
partial cross-sections down to 10-2 meV of collision energy. 相似文献
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A. R. Lopes M. H.F. Bettega M.T. do N. Varella M. A.P. Lima 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,37(3):385-392
We report elastic (rotationally summed) and rotationally resolved
cross-sections for scattering of low-energy electrons by the
C3H4 isomers allene, propyne, and cyclopropene, which belong
to the D2d, C3v, and C2v groups, respectively. We
employed the Schwinger multichannel method with pseudopotentials at
the static-exchange approximation, combined with the
adiabatic-nuclei-rotation (ANR) approximation to calculate the
rotational excitation cross-sections for energies ranging from 5
to 30 eV. Our rotational resolved cross-sections show the isomer effect
more strongly related to scattering potentials of different molecular
geometries and to transition selection rules than to differences in mass
distribution which account for the energy spacing in the rotational
spectra of the molecules. 相似文献
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运用准经典轨线方法,基于Roger的3A"势能面,在碰撞能为104.5 kJ/mol时对O(3P)+D2反应的立体动力学性质进行了理论研究. 详细讨论与产物矢量相关的的极化分布函数以及四个极化微分反应截面进行了. 结果表明,产物OD的立体动力学性质对反应物分子H2相似文献
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The (v′=6,J′=43) level in theB 1Π u electronic state of Na2 has been selectively populated by excitation with the 4 880 Å line of the argon laser. Through collisions with He atoms energy is transferred to neighbouring rotational states in Na2 and the density of these states is determined by observing fluorescence to electronic ground state. From previous measurement of the lifetime of theB 1Π u state and new measurements of the intensities of collision induced spectral lines as a function of He pressure, absolute collision cross sections for all rotational transitions up to ΔJ=±5 have been obtained. The total cross section for all rotational transitions observed is σ rot total =65±15 Å2. Preliminary results about collision induced vibrational transitions are also presented. 相似文献
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A. Bähring E. Meyer I. V. Hertel H. Schmidt 《Zeitschrift für Physik A Hadrons and Nuclei》1985,320(1):141-149
Pronounced polarization effects have been observed in inelastic collisions of laser state-prepared Na*(3p,M L) with Na+ leading to Na*(3d) for the energy rangeE CM=20–45 eV. Using linearly polarized light the dependence of the inelastic process on the alignment of the electronic charge cloud of the Na*(3p) prior to the collision has been measured. In studies with left and right hand circularly polarized light the angular momentum transferred in the collision process has been determined. The results are compared with similar data for the 3p→3s deexitation process studied previously [6]. The density matrix of the Na*(3p) state has been evaluated with respect to the collisional excitation to Na*(3d). Semiclassical calculations based on the coupled channel impact parameter approximation using pseudopotentials [7] and nonadiabatic rotational coupling elements for the Na 2 * system [12] have been performed. The agreement with the experimental results is good, in particular for the higher collision energies. 相似文献