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Measurement of Emission Cross Sections for Inert-gas Atoms by Electron Impact

通过电子碰撞测量惰性气体原子的发射截面

基本信息

批准号：
11440122
负责人：
TSURUBUTI Seiji
金额：
$ 6.02万
依托单位：
Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440122/
关键词：
electron impact inert-gas atom emission cross section evel excitation cross section apparent excitation cross section the 2p_9 state resonance line time-resolved measurement スピン交換衝突平均寿命絶対測定

项目摘要

Emission cross sections for the np→ns and ns→(n-1)p transitions (Ne : n=3, Ar : n=4, Kr : n=5) of inert-gas atoms have been systematically measured from threshold to 1000 eV in the period of 1991〜2000. We have determined absolute emission cross sections as well as the total cascade cross sections to the ns-state in the visible wavelength range. However, a further reconfirmation had been desired for the absolute optical sensitivity in the near infrared wavelength range of the detection system where no standard lamp was available. We adopted a so-called brandling method utilizing Ar spectra. The obtained cross sections show considerable differences in part with those results previously reported.The 2p_9 → 1s_5 transition in Paschen notation is of particular interest because the 2p_9 state is a pure triplet state and well represented by the term^3 D_3 in the LS-scheme. Theoretical excitation cross sections for the 2p_9 state of Ar and Kr show almost 〜 E^<-3> dependence on the impact energy E, whereas, the experimentally obtained cross sections descend more slowly. Time-resolved intensity decays of the 2p_9 → 1s_5 transition show that the most of the population of the 2p_9 state is due to the cascade transitions from the higher lying Rydberg states at high energies.

在1991 ~ 2000年期间，系统地测量了惰性气体原子（Ne：n=3，Ar：n=4，Kr：n=5）的np→ns和ns→（n-1）p跃迁的发射截面.我们已经确定了绝对发射截面以及总级联截面的ns-态在可见光波长范围内。然而，在没有标准灯可用的情况下，需要进一步确认检测系统在近红外波长范围内的绝对光学灵敏度。我们采用了一种所谓的品牌的方法，利用Ar光谱。所得到的截面与以前报道的结果有很大的不同，帕邢记法中的2p_9 → 1s_5跃迁特别令人感兴趣，因为2p_9态是一个纯三重态，在LS方案中可以用项^3 D_3很好地表示。Ar和Kr的2p_9态的理论激发截面几乎<-3>与碰撞能量E成正比，而实验得到的激发截面下降得较慢。2p_9 → 1s_5跃迁的时间分辨强度衰减表明，2p_9态的大部分布居是由高能区里德伯态的级联跃迁引起的。