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Electron energy distribution functions (eedf) in CO2 laser discharge (He—CO2—N2—CO mixture) have been calculated by solving the Boltzmann equation in the presence of given concentrations of excited (vibrational and electronic) states. The results show a well structured eedf as a result of second kind collisions coming from metastable electronic states of N2 and He as well as a strong dependence of rate coefficients for CO2 dissociation and for the ionization of the different species. 相似文献
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Electron energy distribution functions in rf molecular plasmas have been calculated by solving the time dependent Boltzmann equation in the presence as well as the absence of vibrationally and electronically excited molecules and thus of first kind and second kind (superelastic) collisions with them. The results, which refer to a model plasma composed by three components (the ground state, a lumped vibrational state and a lumped electronic state), show that these collisions with vibrationally and electronically excited molecules strongly affect the modulation of the electron energy distribution function and related quantities. 相似文献
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Electron energy distribution functions (edf) in non equilibrium oxygen have been calculated by solving the Boltzmann equation coupled to a system of vibrational master equations. The results show the importance of both superelastic vibrational collisions and of the presence of oxygen atoms in affecting edf. The coupling between the Boltzmann equation and the system of vibrational master equations brings to a temporal evolution of edf, which progressively changes from a cold molecular gas situation (all molecules in the ground vibrational level) to a vibrationally excited molecular gas and finally to a gas composed by oxygen molecules and oxygen atoms. All electronic rate coefficients follow a temporal evolution. due to the corresponding evolution of edf. Finally the present results are used for discussing the dissociation rate of molecular oxygen in electrical discharges. 相似文献
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用三火球模型分析了核--核以AGS(the Alternating Gradient Synchrotron)和SPS(the Super Proton Synchrotron)能量碰撞中产生质子的快度分布. Monte Carlo方法计算的结果分别与金--金以6, 8和10.8A GeV的能量并以不同中心性碰撞、铅-铅以158A GeV/c的动量碰撞、以及硫-硫以200A GeV/c的动量碰撞的实验数据符合. 相似文献
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采用一种仔细考虑了作用截面、表面弥散和形变效应的核碰撞几何,同时考虑到在每一次碰撞中领头质子损失能量,得到了高能p-Al碰撞的横能分布,计算结果与200GeV/cp-Al、Cu及U碰撞的实验数据符合.In this paper, the nuclear collision geometry which was considered carefully in the interaction cross sections, surface effects and nuclear deformations is adopted. The energy loss of leading proton in each collision is considered. The transverse energy distributions in high energy p A collisions are obtained. The calculated results are in agreement with the experiment data of 200 GeV/ c p Al, Cu and U collisions. 相似文献
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The Effect of Secondary Collisions in the Rapidity Distribution in Relativistic Heavy Ion Collisions
Based on the participant model the effect of secondary collisions in relativistic heavy ion collisions is analyzed by introducing additional contributions in fragmentation regions. The rapidity distributions of n of NA35 and WA80 groups are well reproduced. Special improvement is shown in the target fragmentation region. 相似文献
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通过求解Lorentz简化的玻尔兹曼方程,得到射频放电CH4等离子体中电子的能量分布函数.求解过程中使用一个简化的射频电场模型代替泊松方程求解放电电场.共计包含6类环境气体及27种电子碰撞反应.通过EEDF对等离子体中的电子反应率系数、电子平均能量、电子的传输率系数等进行求解分析.结果表明,在等离子体鞘层区域电子能量具有Maxwell分布形式,在正柱区域具有Druyvesteyn分布形式.最高电子能量和最大反应率系数出现在鞘层区域.电子的迁移率系数和扩散率系数随射频周期的演化时空分布不均匀. 相似文献
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Kolesnikov V. Kireyeu V. Lenivenko V. Mudrokh A. Shtejer K. Zinchenko D. Bratkovskaya E. 《Physics of Particles and Nuclei Letters》2020,17(2):142-153
Physics of Particles and Nuclei Letters - Data on hadron multiplicities from inelastic proton-proton interactions in the energy range of the NICA collider have been compiled. The compilation... 相似文献
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测量了K- Cs混合蒸气中碰撞能量合并过程K(4P) +Cs(5D)→Cs(6S) +K(4D ,6S)速率系数,测量是相对于已知速率系数的过程[即Cs(6P) +Cs(5D)→Cs(6S) +Cs(7DJ) ]进行的。利用激光光解K2 和Cs2分子,得到Cs(6P ,5D)和K(4P)态原子,探测直接由光解离产生的原子发射的与由碰撞转移而布居的原子激发态发射的荧光的相对强度,结合Cs(6P)和K(4P)态的有效寿命,得到异核碰撞能量合并速率系数分别为2. 6×10 -9和3 .6×10 -9cm3 ·s-1。讨论了其他过程对速率系数的影响。 相似文献
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《中国物理C(英文版)》1991,15(2):131-139
The intermittency of multiparticle production processes in high energies oxygen,silicon and sulphur induced emulsion and sulphur gold interactions are investigated systematically.It is found that in the pseudorapidity region 1~0.1,the EMU01 data exhabits the intermittent behaviour.The intermittent indexes are found to decreases with increasing the incident energy and mean multiplicity and to increase with increasing target mass.It seems also to increase as the projectile mass increases. 相似文献
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利用强子-强子碰撞的模型PYTHIA以及核-核碰撞的模型RQMD比较了各种电荷起伏测量量的快度依赖性,结果发现,这些测量量对快度的依赖性依赖于模型. 但是,电荷关联能很好地测量整体电荷守恒以及短程快度关联性质. 因此,被认为是一个好的反应电荷起伏的测量量. 相似文献
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Abstract The behaviour of electron energy function distribution in hollow cathode discharge at resonant light irradiation is analyzed. The function is calculated for energies near and higher than the energy excitation ?1 of the hellium metastable levels. It turns out that the electron energy function distribution is essentially influenced in the vicinity of point ?1. 相似文献
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Lo Ronnie H. Miley George H. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1974,2(4):198-205
An integral balance technique for calculation of the electron energy distribution in a radiation-induced plasma is described. Results predict W-values reasonably well and compare favorably with more complicated Monte-Carlo calculations. The distribution found differs from that in a normal electrical discharge and is of interest in radiation-pumped laser research. 相似文献
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综述了重离子耗散碰撞激发函数中截面涨落现象的实验与理论研究的现状. The present status of the studies on the cross section fluctuation phynomeno in dissipative heavy ion collisions (DHIC) is reviewed, especially for the fluctuation characteristics and the theoretical deuelopment. 相似文献