Observation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:mn>70</mml:mn><mml:mn /></mml:math>Quasiatomic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>X Rays from 30- and 60-MeV<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Br</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow><mml:mn>35</mm

Meyerhof, W. E.; Saylor, T. K.; Lazarus, S. M.; Little, W. A.; Triplett, B. B.; Chase, L. F.

doi:10.1103/physrevlett.30.1279

Cited by 69 publications

(8 citation statements)

References 8 publications

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“…For this reason, attention was directed toward high-Z w ion-atom collisions, where the energy levels are less sensitive to the charge state of the ions, and the MO x rays could conceivably be calculated with one-electron MO's. Meyerhof et aL (1973) reported the observation of Is a MO x rays in Br + Br collisions whose end points matched that expected for the UA (Z=70). This work was challenged by Davis and Greenberg (1974), most seriously on the grounds that the end-point energy is not a sufficient clue to the identity of the continuum x rays: first, because high-energy nucleus-nucleus bremsstrahlung (NNB) and x-ray continuum backgrounds (see Sec.…”

Section: Historical Overviewsupporting

confidence: 55%

X rays from quasimolecules

Anholt

1985

Rev. Mod. Phys.

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In slow heavy-ion-atom collisions, inner-shell electrons with velocities larger than the projectile velocity form diatomic molecular orbitals around the projectile and target nuclei. If a vacancy exists in one of these orbitals, it can decay at some point during collision, emitting an x ray characteristic of the molecular transition energy at that internuclear distance. Since the projectile-target internuclear distance varies during the collision, x-ray continua are seen, which for \so molecular-orbital x rays (transitions to vacancies in the lowest Iscr orbital) stretch toward the united-atom AT-shell binding energy. This paper reviews the theory of and the experimental evidence for molecular-orbital x-ray emission. A historical overview of the development of these studies is given, showing how the theory of quasimolecular x-ray emission has evolved from a semiclassical quasistatic model to a general dynamic theory, including the Coriolis coupling between molecular orbitals making up the initial and final states. X-ray cross section, angular distribution, and other measurements are discussed, and their impact on the development of the theory of molecularorbital x-ray emission is illustrated.

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Section: Historical Overviewsupporting

confidence: 55%

X rays from quasimolecules

Anholt

1985

Rev. Mod. Phys.

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“…However, it is possible to make comparisons with experimental dat& for the lighter elements. Scofield has compared the total K emission rates with experimental quantities for 10 elements between Z = 16 and 79, and the agreement appeared to be within the experimental uncertainties.…”

Section: Numerical Resultsmentioning

confidence: 99%

Theoretical x-ray transition probabilities for high-Zsuperheavy elements

Anholt¹,

Rasmussen

1974

Phys. Rev. A

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K and L x-ray transition probabilities have been calculated for several elements between Z = 92 and Z = 170. The calculations include multipoles higher than El, are relativistic, and utilize Dirac Hartree-Fock wavefunctions with finite size nuclei. At these very high atomic numbers, many transition rates go through a maximum withz and other transitions show a maximum and a minimum, and then begin to increase again past Z = 150.-1- LBL-1947

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“…These authors showed that the anisotropies reach a maximum at an X-ray energy which can only be explained by transitions into the 2p a-minimum. Evidence for the quasimolecular nature of this continuum also is given by the fact that the Dopplershift-determined following the method of Meyerhof et al [1][2][3][4][5]-is due to the center-of-mass-motion of the colliding system. In our measurements described below we determined the energies of the peak centroids of the 2p a-aniso- tropies in five symmetric systems in order to investigate the Z-dependence of the effect.…”

Section: Introductionmentioning

confidence: 98%

“…By quasimolecular radiation we understand radiation produced by transitions between transiently formed inner shell orbitals around the two charge centers. The X-ray continuum is composed of two parts: a high energy-continuum-extending up to energies above the united atom K-limit-which can be attributed to MO-lsa-radiation [1] and a more steeply decreasing low energy part which does not fit into the quasiatomic picture since it reaches energies which are much higher than the united atom L-limit. This radiation has been interpreted as being due the transitions into the minimum of the 2pa-orbital [2].…”

Section: Introductionmentioning

confidence: 99%

The anisotropy of the MO-2p?-radiation observed in symmetric heavy ion collisions

et al. 1978

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The anisotropies of the MO-2p a-radiation have been measured for five symmetric systems with a united atom number Z u between 52 and 94 at beam energies in the range from 7 up to 66 MeV. A comparison with the available theoretical data suggests that the anisotropic part of the 2pa-radiation is mainly due to transitions from near continuum initial states into the minimum of the molecular 2pa-orbital.

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Observation ofZ=70QuasiatomicKX Rays from 30- and 60-MeVBr35

Cited by 69 publications

References 8 publications

X rays from quasimolecules

X rays from quasimolecules

Theoretical x-ray transition probabilities for high-Zsuperheavy elements

The anisotropy of the MO-2p?-radiation observed in symmetric heavy ion collisions

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