The current status of superelastic scattering studies for e<sup>-</sup>-Na atom collisions

Sang, R. T.; Farrell, Peter M.; Madison, Don H.; MacGillivray, W. R.; Standage, M. C.

doi:10.1088/0953-4075/27/6/018

Cited by 25 publications

(20 citation statements)

References 40 publications

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“…Computer Stokes parameters for (i) the excitation of the 3S-3P transition and (ii) the de-excitation of the 4S-3P transition by 22 eV incident electrons. Previous measurements by Scholten et al (1993), Sang et al (1994) and Hermann et al (1977) are shown together with the present data and calculations.…”

Section: Methodssupporting

confidence: 66%

Atomic collision parameters for electron de-excitation of the 4S-3P transition of sodium

Shurgalin

Murray

MacGillivray

et al. 1999

J. Phys. B: At. Mol. Opt. Phys.

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A comparison of measured Stokes parameters and atomic collision parameters (P lin , γ, L ⊥ , P +) is made for the excitation and de-excitation of the 3S-3P and 4S-3P transitions of Na respectively, for electrons with incident energies of 22, 30 and 50 eV. These parameters are obtained from 'time-inverse' experiments in which electrons are either superelastically (3P-3S) or inelastically (3P-4S) scattered from the laser prepared 3P state. The data are compared with calculations from a convergent close coupling (CCC) model and a second-order distorted wave Born (DWB2) model. Both models demonstrate very good agreement for 3S-3P transitions. For the 4S-3P transitions, the DWB2 is in better accord with experiment than the CCC for the P lin parameter, the CCC is in excellent agreement with experiment for γ and L ⊥ , and neither is in accord with experiment for P + .

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Section: Methodssupporting

confidence: 66%

Atomic collision parameters for electron de-excitation of the 4S-3P transition of sodium

Shurgalin

Murray

MacGillivray

et al. 1999

J. Phys. B: At. Mol. Opt. Phys.

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“…Rabi frequency (GHz) Measurements involving electron superelastic scattering from the 32P3/2 level of Na excited from both states of the 3 2 S1/ 2 ground level by radiation from two lasers have been performed recently (Sang et al 1994). Values for pi and P~ at electron scattering angles of greater than 15° were able to be obtained.…”

Section: Superelastic Scattering Methods (2a) Modelling Of Optical Pummentioning

confidence: 99%

“…The experimental protocol was similar to the single step superelastic scattering experiments (see, for example, Sang et al 1994) and details are given elsewhere (Sang 1995). The energy gaps between the 3 2 S1/ 2 and the 3 2 P 3 / 2 levels and the 3 2 P 3 / 2 and 32D5/2 levels are 2·1 and 1· 6 e V respectively.…”

Section: (2b) Electron Superelastic Scattering From the 3 2 D S / 2 Lmentioning

confidence: 99%

“…The vertical error bars are the statistical estimate of one standard deviation, while the horizontal bars indicate the error in the value of the scattering angle. The experimental data are compared with theoretical calculations by Madison (1994) and McEachran (1994) using second order distorted wave Born approximation (DWBA2) models (Bartschat and Madison 1987;Zuo et ai. 1991;Srivastava et al 1992).…”

Section: Stepwise Electron-laser Excitation Coincidence Measurements mentioning

confidence: 99%

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New Data from Laser Interrogation of Electron-Atom Collisions Experiments

Masters¹,

Sang²,

MacGillivray³

et al. 1996

Aust. J. Phys.

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Recent data from two methods in which high resolution laser radiation is used to assist in determining electron-atom collision parameters are presented. The electron superelastic method has yielded the first measurement of Stokes parameters for electron de-excitation of the 32D5/2-32P3/2,1/2 transition of atomic Na, the upper level having been optically prepared by resonant, stepwise excitation from the 3 2 S1/ 2 ground level via the 3 2 P 3/ 2 level using two single mode lasers. As well, we report on the development of a model to determine the optical pumping parameters for superelastic scattering from the 3 2 P 3/ 2 level when it is prepared by two lasers exciting from the F = 1 and F = 2 states respectively of the 3 2 S1/ 2 ground level. Data are also presented for collision parameters for the excitation of the 6 1 So-6 1 PI transition of the I = 0 isotope of Hg by electrons of 50 e V incident energy. The technique employed for these measurements is the stepwise electron-laser excitation coincidence method, in which the electron excited atom is further excited by resonant laser radiation, and fluorescence photons emitted by relaxation from the laser excited state are detected in coincidence with the scattered electron.

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“…Shortly thereafter similar studies on Ba (see, e.g., Register et al 1978Register et al , 1983 were initiated in our laboratory. Measurements have been reported subsequently on Na (Herman and Hertel 1982, McClelland et al 1992, Sang et al 1994, Hall et al 1996, Ba (Zetner et al 1990, Li and Zetner 1994a, Ca Teubner 1995, Teubner et al 1996), Li (Karagonov et al 1996, Rb (Hall et al 1996), Cr (Hanne et al 1993) and Yb (Li and Zetner 1994b). In these studies the superelastic scattering signal corresponding to the electron-impact de-excitation of the laser-prepared state to the ground state was measured as a function of the laser geometry and polarization (with respect to the collision frame).…”

Section: Introductionmentioning

confidence: 98%

Elastic electron scattering by laser-excited¹³⁸Ba( ... 6s6p¹P₁) atoms

Trajmar

Kanik

Khakoo

et al. 1999

J. Phys. B: At. Mol. Opt. Phys.

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Abstract.The results of a joint experimental and theoretical study concerning elastic electron scattering by laser-excited 138 Ba(. . . 6s6p 1 P 1 ) atoms are described. These studies demonstrate several important aspects of elastic electron collisions with coherently excited atoms, and are the first such studies. From the measurements, collision and coherence parameters, as well as cross sections associated with an atomic ensemble prepared with an arbitrary in-plane laser geometry and linear polarization (with respect to the collision frame), or equivalently with any magnetic sublevel superposition, have been obtained at 20 eV impact energy and at 10 • , 15 • and 20 • scattering angles. The convergent close-coupling (CCC) method was used within the non-relativistic LS-coupling framework to calculate the magnetic sublevel scattering amplitudes. From these amplitudes all the parameters and cross sections at 20 eV impact energy were extracted in the full angular range in 1 • steps. The experimental and theoretical results were found to be in good agreement, indicating that the CCC method can be reliably applied to elastic scattering by 138 Ba(. . . 6s6p 1 P 1 ) atoms, and possibly to other heavy elements when spin-orbit coupling effects are negligible. Small but significant asymmetry was observed in the cross sections for scattering to the left and to the right. It was also found that elastic electron scattering by the initially isotropic atomic ensemble resulted in the creation of significant alignment. As a byproduct of the present studies, elastic scattering cross sections for metastable 138 Ba atoms were also obtained.

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The current status of superelastic scattering studies for e^--Na atom collisions

Cited by 25 publications

References 40 publications

Atomic collision parameters for electron de-excitation of the 4S-3P transition of sodium

Atomic collision parameters for electron de-excitation of the 4S-3P transition of sodium

New Data from Laser Interrogation of Electron-Atom Collisions Experiments

Elastic electron scattering by laser-excited¹³⁸Ba( ... 6s6p¹P₁) atoms

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The current status of superelastic scattering studies for e--Na atom collisions

Cited by 25 publications

References 40 publications

Atomic collision parameters for electron de-excitation of the 4S-3P transition of sodium

Atomic collision parameters for electron de-excitation of the 4S-3P transition of sodium

New Data from Laser Interrogation of Electron-Atom Collisions Experiments

Elastic electron scattering by laser-excited138Ba( ... 6s6p1P1) atoms

Contact Info

Product

Resources

About

The current status of superelastic scattering studies for e^--Na atom collisions

Elastic electron scattering by laser-excited¹³⁸Ba( ... 6s6p¹P₁) atoms