The Polarization by Mercury of 1 to 2 keV Electrons

Bunyan, P J

doi:10.1088/0370-1328/81/5/304

Cited by 9 publications

(5 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The method is much easier to use than (i) above and extensive calculations have been made on the structures of ions and atoms (e.g. Blume and Watson 1962, 1963Herman and Skillman 1963;Mal1i 1967;Beck 1969;Jones 1970).…”

Section: Introductionmentioning

confidence: 99%

“…Earlier calculations based on the Dirac equation have used a strongly screened Coulomb field with electron exchange neglected (Bunyan 1963;Holzwarth and Meister 1964;Biihring 1968;Weiss 1969). Carse and Walker (1973) have used the Dirac equation to formulate a theory of electron-atom scattering, and Walker (1969Walker ( , 1970aWalker ( , 1970bWalker ( , 1971Walker ( , 1975 has made calculations for several atoms with nuclear charge Z in the range 2 < Z < 100.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Relativistic Effects in Electron Scattering by Atoms. I. Elastic Scattering by Mercury

Lam¹

1980

Aust. J. Phys.

View full text Add to dashboard Cite

Elastic scattering of electrons in the energy range 0-25 eV by mercury atoms is investigated by applying a perturbation method to the (nonrelativistic) Schrodinger equation. Relativistic correction to the potential is treated using two models: a Pauli approximation and a second-order Dirac potential. The nonrelativistic Hartree-Fock wavefunction is used to describe the target in the zeroth order approximation. Electron exchange is found to be important in the collision. The relativistic correction due to mass variation makes a significant contribution, in particular to p-wave scattering which is dominated by a low energy shape resonance. Phase shifts for s-, p-, d-and f-wave scattering are presented. An analytic expression for the momentum transfer cross section for relativistic scattering is obtained. The total cross section, momentum transfer cross section, differential cross section and spin polarization are calculated and compared with experiment.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relativistic Effects in Electron Scattering by Atoms. I. Elastic Scattering by Mercury

Lam¹

1980

Aust. J. Phys.

View full text Add to dashboard Cite

show abstract

“…If we attempt to make such assignments , we find that the multiplet companions of the lines tentatively attributed to Ar I are conspicuously absent. 5 6 We find that at 400 eV the optical cross sections are about 0.1, 2.5, 1.5, and 0.3 times the total chargeexchange cross sections for He on Ne, Ar, Kr, and Xe, respectively. Our suggestion, of course, requires that these ratios be unity or less.…”

mentioning

confidence: 67%

“…(London) A227, 466 (1955). 6 We find that at 400 eV the optical cross sections are about 0.1, 2.5, 1.5, and 0.3 times the total chargeexchange cross sections for He on Ne, Ar, Kr, and Xe, respectively. Our suggestion, of course, requires that these ratios be unity or less.…”

mentioning

confidence: 69%

“…Two significant advances have recently been made in this field, namely, the ejection of polarized photoelectrons from a polarized atomic beam, 1 ' 2 and Mott scattering of electrons from the screened Coulomb charges of beams of mercury and gold atoms in the keV energy range, 3 ' 4 based on the theory of Mohr, 5 Bunyan, 6 and others. 7 We wish to point out here that a perhaps even more powerful method for the production of intense beams of polarized electrons is a direct consequence of the recent discovery by Simpson and his co-workers 8 of a doublet structure in the resonance for elastic scattering of electrons by neon atoms at 16 eV (0o6 eV below the first excitation level), based on earlier work by Schulz, 9 Simpson, 10 and others, 11 and interpreted by Fano.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Spin Polarization of Slow Electrons by Elastic Resonance Scattering from Neon

Franzen

Gupta

1965

Phys. Rev. Lett.

View full text Add to dashboard Cite

The generation of intense beams of polarized electrons is of considerable interest at the present time. Two significant advances have recently been made in this field, namely, the ejection of polarized photoelectrons from a polarized atomic beam, 1 ' 2 and Mott scattering of electrons from the screened Coulomb charges of beams of mercury and gold atoms in the keV energy range, 3 ' 4 based on the theory of Mohr, 5 Bunyan, 6 and others. 7 We wish to point out here that a perhaps even more powerful method for the production of intense beams of polarized electrons is a direct consequence of the recent discovery by Simpson and his co-workers 8 of a doublet structure in the resonance for elastic scattering of electrons by neon atoms at 16 eV (0o6 eV below the first excitation level), based on earlier work by Schulz, 9 Simpson, 10 and others, 11 and interpreted by Fano. 12 The questions raised by these experiments are also of more general interest in connection with the nature of autoionizing atomic energy states. 13 " 15 The resonance observed by Simpson 8 in the 4 Some of the observed strong lines can be associated with Ar I transitions. If we attempt to make such assignments , we find that the multiplet companions of the lines tentatively attributed to Ar I are conspicuously absent. 5 J. B. H. Stedeford and J. B. Hasted, Proc. Roy. Soc. (London) A227, 466 (1955). 6 We find that at 400 eV the optical cross sections are about 0.1, 2.5, 1.5, and 0.3 times the total chargeexchange cross sections for He on Ne, Ar, Kr, and Xe, respectively. Our suggestion, of course, requires that these ratios be unity or less. The uncertainties in the absolute values of both the optical and charge-exchange cross sections are so large that we can assume that the true values of all of the apparent optical cross sections are less than or at most are equal to the total charge-exchange cross section. 7 H. S. W. Massey, Rept. Progr. Phys. L2, 248 (1949).In making this estimate we have neglected the change in velocity at impact, and we have assumed that the energy levels approach each other at the rate of 10 eV/A (see reference 3). 9 H. G. Utterback and H. P. Broida, Phys. Rev. Letters 15., 608 (1965). total cross section for the scattering of electrons from neon consists of a small decrease in cross section, followed by two successive peaks, of which the first is approximately twice as pronounced at the second. The two peaks are separated by 0.095 eV, corresponding close ly to the P l/2 -Pz/2 fine-structure splitting in the ground state of Ne + . In view of these facts, the resonances have been interpreted by Simpson and Fano 12 as corresponding to the formation of metastable compound states with the configuration (ls 2 2s 2 2/> 5 3s 2 )P 1/2>3/2 , that is, states of the Ne"" ion formed by adding a 3s electron to the lowest excited state of neon. There is little doubt that this interpretation is correct in view of the energy location, separation, and relative statistical weights of the two states. Under these circumstances, interference betwe...

show abstract

Neue Ergebnisse zur Polarisation langsamer Elektronen (0,5 bis 1,5 keV) durch elastische Streuung an freien Hg-Atomen

Deichsel

Reichert

1964

Naturwissenschaften

View full text Add to dashboard Cite

The Polarization by Mercury of 1 to 2 keV Electrons

Cited by 9 publications

References 7 publications

Relativistic Effects in Electron Scattering by Atoms. I. Elastic Scattering by Mercury

Relativistic Effects in Electron Scattering by Atoms. I. Elastic Scattering by Mercury

Spin Polarization of Slow Electrons by Elastic Resonance Scattering from Neon

Neue Ergebnisse zur Polarisation langsamer Elektronen (0,5 bis 1,5 keV) durch elastische Streuung an freien Hg-Atomen

Contact Info

Product

Resources

About