Vibrational excitation of D2 by low energy electrons
Vibrational excitation of D2 by low energy electrons
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低能电子对 D2 的振动激发
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
A. Phelps
中科院分区：
文献类型：
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作者：
S. Buckman;A. Phelps
通过测量D2与低浓度CO2或CO的混合物的红外发射强度，确定了低能电子产生振动激发D2的激发系数。测量采用电子漂移管技术，覆盖电场与气体密度比（E/n）为（5至80）×10−21 V m2，对应于平均电子能量在0.45至4.5 eV之间。CO2和CO浓度的选择是为了使D2向含碳分子的激发有效转移，但尽量减少CO2或CO的直接激发。测量的红外强度被归一化为N2-CO2和N2-CO混合物在E/n下的预测值，其中振动激发的效率已知非常接近100%。在电子平均能低于1 eV时，实验激发系数与基于电子- d2截面的预测结果吻合得很好，但在电子平均能低于1 eV时，实验激发系数高出约50%。
Excitation coefficients for the production of vibrationally exicted D2 by low energy electrons have been determined from measurements of the intensity of infrared emission from mixtures of D2 and small concentrations of CO2 or CO. The measurements were made using the electron drift tube technique and covered electric field to gas density ratios (E/n) from (5 to 80)×10−21 V m2, corresponding to mean electron energies between 0.45 and 4.5 eV. The CO2 and CO concentrations were chosen to allow efficient excitation transfer from the D2 to the carbon containing molecule, but to minimize direct excitation of the CO2 or CO. The measured infrared intensities were normalized to predicted values for N2–CO2 and N2–CO mixtures at E/n where the efficiency of vibrational excitation is known to be very close to 100%. The experimental excitation coefficients are in satisfactory agreement with predictions based on electron–D2 cross sections at mean electron energies below 1 eV, but are about 50% too high at mean energies ...