Electron Beam Excitation of Metal Vapor Excimers

金属蒸气准分子的电子束激发

基本信息

  • 批准号:
    05452069
  • 负责人:
  • 金额:
    $ 3.52万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
  • 财政年份:
    1993
  • 资助国家:
    日本
  • 起止时间:
    1993 至 1994
  • 项目状态:
    已结题

项目摘要

There have been many studies of alkali dimer diffuse bands because of the excimer-type nature.In this work, aimed at understanding the characteristics of the electrical excitation of such diffuse bands and achieving new tunable and high power excimer lasers, we report on the investigation of the Na_2 violet, K_2 yellow and Rb_2 red band emissions and gain measurements by electron beam pumping. The e-beam facility used in the experiment had a peak current of 15kA,a pulse width of 50 ns, and an electron particle energy of 300 keV.A net gain coefficient of 4.5% of the K_2 yellow diffuse band was observed from e-beam-excited mixtures of K/K_2 vapor with argon or helium buffer gas. The continuum spectra centered at 574 nm were attributed to triplet-triplet K_2 2^3II_g*1^3SIGMA^+_u bound-free transitions. Also, an ASE of the Na_2 violet, K_2 yellow and Rb_2 red bands were observed when the excitation energy density exceeded 5 mJ/cm^3. Calculated spectra of the Na_2 and K_2 2^3II_g*1^3SIGMA^+_u by using ab initio potentials are in good agreement with the observed one. The high population density of the 2^3II_g state was proposed to be due to the dissociative recombination of alkali trimer ions (Na_3^+, K_3^+ or Rb_3^+) which are efficiently yielded by electron beam excitation.K_3^++e^-*K_3^* (unstable) *K+K_2 (2^3II_g),Because the reaction energy difference delta E is 0.03 eV for Na and 0.28 eV for K.The process is predicted to have large cross sections. Thus, the upper state of such specific excimer transition may be produced selectively by this reaction kinetics following a very nonselective ionization. For this reason, the potential alkali dimer 2^3II_g*1^3SIGMA^+_u laser might be very suitable for electrically pumping. It is quite conceivable that such dissociative recombination-based excimer lasers might also be presented in the other metal vapor mediums.
碱金属二聚体的扩散带由于其受激准分子的性质而得到了广泛的研究,本文以了解这种扩散带的电激发特性和研制新型的可调谐高功率受激准分子激光器为目的,报道了用电子束泵浦的Na_2紫、K_2黄和Rb_2红波段的发射和增益测量。实验所用电子束装置的峰值电流为15 kA,脉冲宽度为50 ns,电子粒子能量为300 keV。在K/K_2蒸气与Ar或He缓冲气体的混合气体中,电子束激发的K_2黄色扩散带的净增益系数为4.5%。中心位于574 nm处的连续谱属于三重态-三重态K_22^3II_g *1^3SIGMA^+_u束缚-自由跃迁。当激发能密度超过5 mJ/cm^3时,还观察到Na_2紫、K_2黄和Rb_2红的ASE。Na_2和K_2的2^3II_g*1^3SIGMA^+_u的从头算光谱与实验结果符合得很好。2^3II_g态的高布居密度被认为是由于碱金属三聚体离子的解离复合K_3 ^++e^-* K_3^*(不稳定)*K+K_2(2^3II_g),因为Na和K的反应能差Δ E分别为0.03eV和0.28eV。因此,这种特定的受激准分子跃迁的上态可以在非常非选择性的电离之后通过这种反应动力学选择性地产生。因此,潜在的碱金属二聚体2^3II_g*1^3SIGMA^+_u激光器可能非常适合电泵浦。完全可以想象,这种基于解离复合的准分子激光器也可以存在于其他金属蒸气介质中。

项目成果

期刊论文数量(33)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
D.Xing, K.Ueda and H.Takuma: "Long-Lived Zn_2 Excimer Excimer Excited by Relativistic Electron Beam" , Proceedings of The 3rd Topical Meeting on FEL and High Power Radiation, edited by S.Hiramatsu, (National Laboratory for High Energy Physics. 199-218 (19
D.Xing、K.Ueda 和 H.Takuma:“Long-Lived Zn_2 Excimer Excimer Excited by Relativistic Electron Beam”,第三届 FEL 和高功率辐射专题会议论文集,S.Hiramatsu 编辑,(国家高能实验室)
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D.Xing,K.Ueda and H.Takuma: "Electron Beam Excitation of Zn_2 excimer" -Jpn.J.Appl.Phys.33. 1676-1679 (1994)
D.Xing、K.Ueda 和 H.Takuma:“Zn_2 准分子的电子束激发”-Jpn.J.Appl.Phys.33。
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Da Xing (けい 達): "Vacuum ultraviolet transitions from rare-gas alkali metal ionic excimers" J. Phys. B. 28(to be published). (1995)
大兴:“稀有气体碱金属离子准分子的真空紫外跃迁”J.Phys.B.28(待出版)。
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D.Xing,K.Ueda and H.Takuma: "Long-Lived Zn_2 Excimer Excited by Relativistic Electron Beam" Proc.of 3rd Topical Meeting on FEL and High Power Rad.3. 199-218 (1993)
D.Xing,K.Ueda 和 H.Takuma:“由相对论电子束激发的长寿命 Zn_2 准分子”Proc.of 第三届 FEL 和高功率 Rad 专题会议 3。
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D.Xing,K.Ueda and H.Takuma: "Vacuum ultraviolet transitions from rare-gas alkali metal ionic excimers" J.Phys.B. 28(to be published). (1995)
D.Xing、K.Ueda 和 H.Takuma:“稀有气体碱金属离子准分子的真空紫外跃迁”J.Phys.B。
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XING Da其他文献

靶向纳米探针介导的近红外激光热疗
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    0
  • 作者:
    宋盛;WU Bao-yan;吴宝艳;OU Zhong-min;XING Da;周非凡;欧忠敏;ZHOU Fei-fan;SONG Sheng;邢达
  • 通讯作者:
    邢达

XING Da的其他文献

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