1991 Fiscal Year Final Research Report Summary
Coherence of Foil-Exited One-electron Atom
Project/Area Number |
01550033
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Research Category |
Grant-in-Aid for General Scientific Research (C)
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Allocation Type | Single-year Grants |
Research Field |
物理計測・光学
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Research Institution | Kyoto University |
Principal Investigator |
ISHII Keishi Kyoto Univ. Fac. Engineering, 工学部, 助教授 (30025944)
|
Project Period (FY) |
1989 – 1990
|
Keywords | Beam-foil Spectroscopy / Excitation Coherence / Quantum Beat / Stark Effect / Hydrogen Atom / 偏光測定 |
Research Abstract |
The photon emission of hydrogen atom created after passage though a thin carbon foil was measured by the beam-foil method. 1. Stark Beats of 'Lyman-alpha Emission of Foil-Exited Hydrogen Atom. The Stark beats of polarized Lyman-alpha emission in VUV region were measured by using a MgF_2-coated toroidal mirror. After passage through a thin carbon foil, the static electric field was applied either parallel or anti-parallel to the beam. Upon reversal of electric field, an appreciable phase shift was observed. The analysis of data leads to the complete determination of the density matrix for n=2 minifold. It is noted that the sp-coherence i. e. odd-coherence has an imaginary component. 2. Zero-field Quantum Beat of Balmer-alpha Emission of Hydrogen Atom. The polarized emission of Balmer-alpha line in visible region was observed. Since the number of density matrix elements became large in the presence of electric field, the zero-field quantum beat was measured. It was found that the sd-coherence has an imaginary component, too. 3. Electric-Field-Differental Quantum Beat. We have developed a new method of determining the initial excitation density matrix. This is similar to the well-known Hanle effect, in which polarized photon emission is measured as a function of magnetic field. The new method proved to work well even in very low current density level. It is observed again that the coherence term has an imaginary component. There is no excitation model, whereby the creation of imaginary component of coherence term is explained. This is confirmed in the present study. It is now open for further theoretical study.
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Research Products
(10 results)