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Full-Text Articles in Physical Sciences and Mathematics
The Effect Of Closed Classical Orbits On Quantum Spectra: Ionization Of Atoms In A Magnetic Field, Meng Li Du
The Effect Of Closed Classical Orbits On Quantum Spectra: Ionization Of Atoms In A Magnetic Field, Meng Li Du
Dissertations, Theses, and Masters Projects
A quantitative theory of oscillatory spectra for atoms in a magnetic field is developed. When an atom is placed in a magnetic field, and absorption spectrum into states close to the ionization threshold is measured, it is found that the absorption as a function of energy is a superposition of many sinusoidal oscillations. Such interesting and surprising phenomenon are fully explained and described by the theory.;The theory is based on three approximations: (1) Near the atomic nucleus, the diamagnetic field is negligible. (2) Far from the nucleus, the wave propagates semiclassically. (3) Waves returning to the nucleus are similar to …
Slow Collisions Of Hydride Ion And Deuteride Ion With Sodium, Potassium And Cesium, Yicheng Wang
Slow Collisions Of Hydride Ion And Deuteride Ion With Sodium, Potassium And Cesium, Yicheng Wang
Dissertations, Theses, and Masters Projects
The cross sections of charge transfer and electron detachment in collisions of H$\sp{-}$ and D$\sp{-}$ with Na, K and Cs have been measured for collision energies ranging from 3 to 300 eV. Both charge transfer and electron detachment are significant electron-loss mechanisms for H$\sp{-}$(D$\sp{-}$); both processes exhibit velocity-dependent isotope effects for H$\sp{-}$ and D$\sp{-}$. $\sigma\sb{\rm cg}$(E) displays high energetic thresholds for Na and K (about 20 eV for H$\sp{-}$ + Na and 40 eV for H$\sp{-}$ + K) yet no obvious one for Cs. $\sigma\sb{\rm e}$(E) does not depend on the target as much as $\sigma\sb{\rm ct}$(E) and displays near …