Electron-Impact Molecular Excitation and Dissociation as studied by the Infrared Emission Spectroscopy

为了扩展我们的研究的电子碰撞激发和解离过程中使用的UV-VIS发射光谱，使用红外发射光谱已被提出。我们的主要研究结果如下：1）设计并建造了一台测量电子-分子碰撞过程中红外辐射的新仪器。2）测量了电子-氢碰撞过程中激发态氢原子的帕邢线发射光谱。3）由Balmer线和Pschen线的发射截面确定了激发态氢原子（n=4）的方位角量子数分布。与理论预期相反，4f激发态氢原子的发射截面为正。4）讨论了4f原子的形成机制。5）用紫外-可见发射光谱测定了几种碎片的振动和转动分布，但它们的红外光谱测定还没有完成，有待于进一步测量。6）成功地进行了多普勒轮廓测量。阐明了H_2O、C_2H_2、C_2H_4和HCl的离解动力学。

In order to extend our investigations on the electron-impact excitation and dissociation processes using the UV-VIS emission spectroscopy, the use of the infrared emission spectroscopy has been proposed. The major results of our investigations are as follows.1) A new instrument for the measurement of the infrared emission produced in electron-motlcule collision processes has been designed and constructed.2) The emission spectra of the Paschen line of the excited hydrogen atom produced in e-H_2 collisions have been measured, and its emission cross sections have been determined for electron energies of 20-1000 eV.3) The azimuthal quantum number distribution of the excited hydrogen atom (n=4) has been determined from the emission cross sections of the Balmer and Pschen lines. Contrary to the theoretical expectation, there is a positive emission cross section of the 4f excited hydrogen atom.4) The mechanism for the formation of the 4f atom has been discussed. A curve crossing at a larger nuclear distance in the dissociation process would be the most plausible explanation.5) The vibrational and rotational distributions of several fragment species have been determined in the UV-VIS emissdion spectroscopy.However, their IR determination has not been completed, and is to be measured in future.6) Doppler profile measurements have been successfully carried out. The dissociation dynamics of H_2O, C_2H_2, C_2H_4 and HCI have been clarified.