Citation
Richardson, Audre (1952) Atomic Collisions of Low Relative Velocity. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/9XYRVS30. https://resolver.caltech.edu/CaltechTHESIS:10052017153013846
Abstract
Approximate solutions for the excitation of an atom by a colliding charged particle, developed as perturbations of the state of the system at infinite or asymptotic separation of atom and particle and also as perturbations of the state of the system at vanishing velocity of relative motion, are extended, in the impact parameter form (suit able to collision of heavy particles), to include the interaction of states that are degenerate at asymptotic separation, and to obtain thereby a condition for the Born approximation that depends on the phase relations of degenerate states in the collision and excludes the low velocity region to the Born approximation, except for the excitation of S states. This is a correction of previous theories, which conclude that the Born solution is a general approximation at low velocities for weak interactions.
A low velocity perturbation solution is established in terms of the stationary states of the system and developed to show that, at sufficiently low velocity of relative motion, the atomic states are coupled to the moving particle in the range of interaction. Differences in coupling energy affect the coherence of asymptotically degenerate states in the collision and influence the orientations of final excited states.
Item Type:  Thesis (Dissertation (Ph.D.)) 

Subject Keywords:  (Physics and Mathematics) 
Degree Grantor:  California Institute of Technology 
Division:  Physics, Mathematics and Astronomy 
Major Option:  Physics 
Minor Option:  Mathematics 
Thesis Availability:  Public (worldwide access) 
Research Advisor(s): 

Thesis Committee: 

Defense Date:  1 January 1952 
Record Number:  CaltechTHESIS:10052017153013846 
Persistent URL:  https://resolver.caltech.edu/CaltechTHESIS:10052017153013846 
DOI:  10.7907/9XYRVS30 
Default Usage Policy:  No commercial reproduction, distribution, display or performance rights in this work are provided. 
ID Code:  10491 
Collection:  CaltechTHESIS 
Deposited By:  Benjamin Perez 
Deposited On:  05 Oct 2017 23:01 
Last Modified:  16 May 2023 21:59 
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