Emission anisotropy of x-rays from selected transitions in electronic quasimolecules
The emission anistropy of selected MO transitions has been measured, using the (K x-ray, MO x-ray) coincidence technique. This method exploits the cascade relationship between Molecular Orbital (MO) x-rays emitted in transitions from the 2p quasimolecular shell into the 1ssigma MO and the characteristic K x-ray which results from the filling of the ensuing vacancy in the projectile or target atoms after their separation. The MO x-ray from the selected cascade transition is detected together with other non-cascade background (NCB) MO x-rays originating from sequential collisions or double inner-shell vacancy production processes. In 40 MeV Ni-Ni collisions, this NCP is found to be about 20-30% of the total true coincidence yield, depending on the energy of the MO x-ray. Once the NCB is removed, the computed cascade MO x-ray anisotropy is found to have a photon energy dependence similar to the singles MO x-ray anisotropy but with a dramatic ten-fold increase in overall magnitude. Theoretical predictions for the anisotropy of these selected MO transitions are found to be in agreement with these experimental results. This constitutes the first straight-forward experimental affirmation of the quasimolecular picture used in discussing slow ion-atom collisions.
- Research Organization:
- Yale Univ., New Haven, CT (USA)
- OSTI ID:
- 6407987
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
Similar Records
X-ray spectroscopy of electronic quasimolecules. I. Isolation and study of particular K molecular-orbital transitions
Quasimolecular x-ray spectroscopy for slow Cl/sup 16+/-Ar collisions
Related Subjects
MOLECULES
X-RAY SPECTRA
NICKEL
ION-ATOM COLLISIONS
NICKEL IONS
ANISOTROPY
ENERGY DEPENDENCE
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
MEV RANGE 10-100
ATOM COLLISIONS
CHARGED PARTICLES
COLLISIONS
DATA
ELEMENTS
ENERGY RANGE
INFORMATION
ION COLLISIONS
IONS
METALS
MEV RANGE
NUMERICAL DATA
SPECTRA
TRANSITION ELEMENTS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena