No abstract

Five-MeV He and Ne ions were used to excite the aluminum Ke and KP parent and satellite x-ray spectra of Al metal, oxide, and nitride. Compared to the metal, the En line and Em satellites from the oxide were at energies a few tenths of an eV higher with helium-ion excitation, similar to observations with electron excitation. With neon bombardment, the Ke satellite lines were broader and the energy shifts reduced because of target-atom recoil effects. The chemical shifts in the KP spectra vary from negative in the parent band with helium ions to positive shifts as large as 6 eV in the higher-energy KP satellites produced by neon ions, and were found to depend on the degree of L-shell ionization.

Spectroscopic analysis of light produced by electrodeless discharge in a tektite bubble showed the main gases in the bubble to be neon, helium, and oxygen. The neon and helium have probably diffused in from the atmosphere, while the oxygen may be atmospheric gas incorporated in the tektite during its formation.

Coulomb excitation has revealed gamma rays at 159, 274, 342, 436, and 504 kev in Te 123 ; 435 and 633 kev in Te 125 ; 319 and 419 kev in Ag 107 ; and 306 and 412 kev in Ag 109 . Interpretation of these results in conjunction with excitation curves and coincidence measurements is discussed in terms of proposed energy level schemes. In the case of Te 123 it is concluded that three levels are independently excited. Values are given for the quadrupole moments, Qo, based on the Bohr-Mottelson unified model and for the reduced transition probabilities for excitation, B e (E2).

The effects of isothermal annealing on the profiles of heavy (4×1016 Al+/cm2 at 60 keV) implantations of Al in SiC were investigated by means of the 27Al(p,γ)28Si nuclear resonance technique. Annealing at 1400 °C for 15 min resulted in the apparent outdiffusion of about 30% of the implanted Al, an accumulation of Al at the surface, and a residual peak at the depth of the as−implanted profile. Subsequent annealing showed continued apparent outdiffusion with the release of Al from trapping sites as the rate−limiting process.