Rotational-vibrational excitation in collisions of atomic ions with diatomic molecules. [1-3 KeV]
Rotational-vibrational excitation in atomic ion-diatomic molecule collisions is considered at intermediate ion projectile energies in the range of 1 to 3 keV. Collisions between He/sup +/ and H/sub 2/ are taken as an example. Three separate approaches are used in the description of the collision system. Inelastic energy transfer in collision systems and projectile scattering angle are calculated from a totally classical approach. Cross sections for scattering as a function of momentum transfer vector are calculated from a completely quantum mechanical approach. Molecular transitions from the ground rotational-vibrational state to several excited rotational-vibrational molecular states are considered. Here the nuclei are treated in the Born Approximation and the electrons are treated adiabatically. The potential function used in both of these calculations is composed of a short range repulsive and a long range attractive polarization term used to fit an H/sub 3//sup +/ potential surface from the literature. The third calculation treats molecular rotational-vibrational excitational quantum mechanically while the ion projectile is considered to have a well defined classical trajectory. Electron motion is again considered adiabatically. Molecular excitation probabilities from the ground rotational-vibrational state to several excited rotational-vibrational states are calculated. The potential form used in this last calculation explicitly takes into account the molecular electron distribution as well as terms corresponding to those in the above potential for the classical calculation and for the quantum mechanical calculation.
- Research Organization:
- Connecticut Univ., Storrs (USA)
- OSTI ID:
- 5330437
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HELIUM IONS
ION-MOLECULE COLLISIONS
HYDROGEN
EXCITATION
ADIABATIC APPROXIMATION
BORN APPROXIMATION
CLASSICAL MECHANICS
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
KEV RANGE 01-10
MOMENTUM TRANSFER
POLARIZATION
QUANTUM MECHANICS
SCATTERING
CHARGED PARTICLES
COLLISIONS
ELEMENTS
ENERGY RANGE
ION COLLISIONS
IONS
KEV RANGE
MECHANICS
MOLECULE COLLISIONS
NONMETALS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena