UNT Theses and Dissertations - 3 Matching Results

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A Gauge-Invariant Energy Variational Principle Application to Anisotropic Excitons in High Magnetic Fields

Description: A new method is developed for treating atoms and molecules in a magnetic field in a gauge-invariant way using the Rayleigh-Ritz energy variational principle. The energy operator depends on the vector potential which must be chosen in some gauge. In order to adapt the trial wave function to the gauge of the vector potential, the trial wave function can be multiplied by a phase factor which depends on the spatial coordinates. When the energy expectation value is minimized with respect to the phas… more
Date: December 1983
Creator: Kennedy, Paul K. (Paul Kevin)
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Infrared-Microwave Double Resonance Probing of the Population-Depopulation of Rotational States in the NO₂ and the SO₂ Molecules

Description: A 10.6 ym C02 laser operating a power range S P 200 watts was used to pump some select vibrational transitions in the NO2 molecule while monitoring the rotational transitions (91/9—'100/10), (232f 22 ~~"*242,23> ' (402,38 "393,37) in the (0, 0, 0) vibrational level and the (8q,8—*"^1,7) rotational transition in the (0, 1, 0) vibrational level. These rotational transitions were monitored by microwave probing to determine how the population of states in the rotational manifolds were being altered… more
Date: December 1982
Creator: Khoobehi, Bahram
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Picosecond Laser-Induced Transient Gratings and Anisotropic State-Filling in Germanium

Description: We present a comparative theoretical study of the transient grating coherent effects in resonant picosecond excitation-probe experiments. Signals in both the probe and conjugate directions are discussed. The effects of recombination, non-radiative scattering and spatial and orientational diffusion are included. The analysis is applied to both a molecular and to a semiconductor model. Signal contributions from concentration and orientational gratings are distinguished and their temporal natures … more
Date: December 1982
Creator: Boggess, Thomas F. (Thomas Frederick)
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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