Joint experimental and theoretical study on low-energy elastic electron scattering by gaseous alkynes: Differential cross sections, shape resonances, and methylation effects
Joint experimental and theoretical study on low-energy elastic electron scattering by gaseous alkynes: Differential cross sections, shape resonances, and methylation effects
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DOI：
10.1103/physreva.105.042809
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发表时间：
2022-04
影响因子：
2.9
通讯作者：
M. A. Khakoo;G. Tatreau;J. Childers;K. Oen;J. Fernández;B. Hlousek;M. Zawadzki;F. Bardela;L. V. S. Dalagnol;G. M. Moreira;M. Bettega;A. S. Barbosa
中科院分区：
文献类型：
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作者：
M. A. Khakoo;G. Tatreau;J. Childers;K. Oen;J. Fernández;B. Hlousek;M. Zawadzki;F. Bardela;L. V. S. Dalagnol;G. M. Moreira;M. Bettega;A. S. Barbosa
低能电子被乙烯散射的实验和理论弹性截面的详细比较（），在我们小组早期由Gaufet等人做过。本文介绍了其甲基化衍生物丙炔（propyne）和同分异构体1-丁炔和2-丁炔（2-butyne）。用孔径气源相对流动法测量了入射电子能在1 ~ 30 eV范围内的微分截面和散射角。我们早期的工作是在一个更大的能量范围内进行的。采用带伪势的Schwinger多通道方法，在静态交换加极化近似下对冲击能进行了理论计算。除了微分截面外，我们还给出了积分和动量传递截面，我们用这些截面讨论了这些系统中存在的形状共振和其他物理现象，例如Ramsauer-Townsend最小值的存在。我们还将我们的理论和实验结果与文献中已有的数据进行了比较。
A detailed comparison of experimental and theoretical elastic cross sections for low-energy electron scattering by ethyne (), taken earlier in our group by Gaufet al.[Phys. Rev. A 87, 012710 (2013)10.1103/PhysRevA.87.012710], and some of its methylated derivatives, propyne (), and the isomers 1-butyne and 2-butyne (), taken here, are presented. The present differential cross sections were measured at incident electron energies ranging from 1 eV to 30 eV and for scattering angles fromtousing the relative flow method with an aperture gas source. Our earlier work was taken over a larger energy range of up to. The theoretical calculations were carried out for impact energies up to, employing the Schwinger multichannel method with pseudopotentials in the static-exchange plus polarization approximation. In addition to the differential cross sections, we present the integral and momentum transfer cross sections with which we discuss the shape resonances present in these systems and other physical phenomena, such as the presence of Ramsauer-Townsend minimum. We also compare our theoretical and experimental results with previous data that are available in the literature.