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Chinese Physics Letters

Measurement of Integrated Stokes Parameters for He 3 ^3p State Excited by Spin-Polarized Electrons

丁海兵, 庞文宁, 刘义保, 尚仁成

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

综合司烧参数 P-i (i = 1， 2,3 ) 为他 3 P-3 -> 2 S-3 (1 )(388.9nm ) 在来自扎根的状态的刺激到以后的转变 3 (3 ) 由一根极化 transverselyspin 的电子横梁的 p 状态在近的阀值精力被测量区域。试验性的结果被介绍。线性极化的 P-2 在事件精力范围上与零一致，提供为联合机制的 LS 的证据 3 (3 ) p 状态。测量圆形的极化 P-3 是非零，显示在极化 thespin 的电子原子碰撞过程的强壮的电子电子交换效果。

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综合司烧参数 P-i (i = 1， 2,3 ) 为他 3 P-3 -> 2 S-3 (1 )(388.9nm ) 在来自扎根的状态的刺激到以后的转变 3 (3 ) 由一根极化 transverselyspin 的电子横梁的 p 状态在近的阀值精力被测量区域。试验性的结果被介绍。线性极化的 P-2 在事件精力范围上与零一致，提供为联合机制的 LS 的证据 3 (3 ) p 状态。测量圆形的极化 P-3 是非零，显示在极化 thespin 的电子原子碰撞过程的强壮的电子电子交换效果。
Spin-orbit and exchange effects are separately identified through the measurement of integrated Stokes parameters P2{P}_{2}P2​ and P3{P}_{3}P3​ for the decay radiation from spin-polarized electron impact excited states. The observations are made for the radiations from the transitions ${3p}^{\ensuremath{'}}[\frac{1}{2}{]}_{1}\ensuremath{\rightarrow}{3s}^{\ensuremath{'}}[\frac{1}{2}{]}_{0}$ (616.4 nm) and $3p[\frac{1}{2}{]}_{1}\ensuremath{\rightarrow}3s[\frac{3}{2}{]}_{2}$ (703.3 nm) in neon just above threshold.
Photoionization of He(nsup1sup 1sup1 sup3sup 3sup3P) atoms excited by polarized light
For neon 3p states excited by transversely polarized electrons, the integrated Stokes parameters, and , have been measured from threshold to 300 eV for the decay photons of 692.9, 667.8 and 717.4 nm wavelengths from the and states, respectively. The and parameters for the 692.9 and 667.8 nm transitions indicate similar excitation mechanisms consistent with their similar ` L S component states'. The non-zero indicates the breakdown of L S -coupling and the large values near threshold suggest a significant exchange process. For the 717.4 nm transition, the three Stokes parameters are much smaller than those of the other two lines. The low is surprising since the large (75.4%) -coupled component state was expected to cause large exchange effects.
The 3s-3p excitation of spin-polarized Na atoms by Ne+{\mathrm{Ne}}^{+}Ne+ ions has been studied for impact energies Elab=200{E}_{\mathrm{lab}=200}Elab=200​ eV to 6 keV, i.e., in the adiabatic regime. The total excitation cross section and the three Stokes polarization parameters of the fluorescence light have been measured. The linear polarization of the light shows a preferential excitation of the \ensuremath{\Vert}ml{m}_{l}ml​\ensuremath{\Vert}=1 magnetic substates. The circular polarization probes the spin orientation of the excited 3p state. At the highest impact energies investigated the experimental data are compatible with conservation of spin orientation during the collision. With decreasing impact energy, the spin polarization of the final 3p state becomes smaller than the spin polarization of the initial 3s state. This apparent spin depolarization is attributed to the exchange interaction between the Na valence electron and the unfilled Ne+{\mathrm{Ne}}^{+}Ne+ 2p5{p}^{5}p5 core in the quasimolecule formed during the collision.