WorldCat Identities

Lin, D. L.

Works: 37 works in 38 publications in 1 language and 118 library holdings
Roles: Author
Publication Timeline
Most widely held works by D. L Lin
Effect of volume fraction and size of fine gamma-prime particles on raising the creep strength of a DS nickel-base superalloy( Book )

1 edition published in 1986 in English and held by 80 WorldCat member libraries worldwide

Soft X-Ray Photoemission Properties for the Newly Modeled Materials Gold, Silver, Copper, and Carbon( Book )

1 edition published in 1979 in English and held by 2 WorldCat member libraries worldwide

The work represents a continuation in our program to model soft x-ray photoemission for exploding wire radiator (EWR) sources incident on various materials. This program falls within the larger program SKYNET which is concerned with SGEMP effects for soft x-ray sources. Results are presented for four newly modeled materials - Au, Ag, Cu, and C. These results include the detailed atomic information required to model each material and photoemission and backscatter results obtained with the code SXRP. In particular, photoemission spectra and total primary yields are presented for an EWR source incident on the four materials cited. Their measured counterparts are included for comparison. Some comparisons provide good agreement while others call for further investigation. For Au, additional spectra and yields are presented for sources narrow in energy to compare with available published data. The photon energy range considered is between 1 and 5 keV. Good overall agreement is obtained with the data. (Author)
Interface Phonons in Semiconductor Double Heterostructures( Book )

1 edition published in 1989 in English and held by 1 WorldCat member library worldwide

Within the framework of the continuum model, the equation of motion for the polarization vector in a semiconductor double heterostructure is solved exactly for the interface phonon modes. Both the eigenvectors and dispersion relations are obtained analytically. It is shown that the slab modes observed in right-angle Raman scattering in a Gallium Arsenides quantum can be understood in terms of the interface modes found in this paper. Keywords: Interface phonons; Semiconductors; Double heterostructures; Dispersion relations; Eigenvectors; Raman scattering
Optical Nonlinearity in Coupled Exciton-Phonon Systems Near Metal Surfaces( Book )

2 editions published in 1991 in English and held by 1 WorldCat member library worldwide

Surface effects on optical bistability and pump-probe processes for coupled exciton-phonon systems are studied theoretically. When a laser beam is directed on an excitron-phonon coupling system inside an optical cavity, the cavity field intensity is investigated as a function of the driving field intensity for various distances between the sample and a metallic surface representing one of the mirrors of the cavity. It is found that the direction of switch of the optical bistability can be controlled by adjusting the distance from the surface. For a strong laser pump field and a weak probe field directed on this system, the pump-field-induced absorption spectrum is investigated for different distances between this sample and the metal surface. It is found that the position and line shape of the spectrum are significantly changed due to the presence of the surface
Soft X-Ray Photoemission and Charge Deposition Near Material Interfaces( Book )

1 edition published in 1978 in English and held by 1 WorldCat member library worldwide

The work reported here comes under two distinct headings: soft x-ray photoemission and charge deposition profiles near irradiated material interfaces. The first electron backscatter results using the SXRP code are reported. Good agreement is obtained with measurements for 5 keV electrons incident on Al. The effect of elastic scattering on the photoemission spectrum is analyzed in further detail following the initial observations made in a previous DNA contract. Additional code validation tests plus the good agreement with measurements for backscatter confirm the previous result that scattering significantly effects the photoemission spectrum. A simple technique is presented which relates the inner shell ionization IMFP to the corresponding photoionization cross section. The technique is tested on the K and L shells of Al and gives IMFP's which agree well with more rigorous results. The development of an empirical photoemission code is reported along with spectra and yields for exploding wire sources incident on Al, Au, Ag, and C. Finally charge deposition profiles for several material configurations containing thin foils are obtained with the POEM code and compared with data by Frederickson. In general, good agreement is achieved. (Author)
Gap States of Charged Solitons in Polyacetylene( Book )

1 edition published in 1989 in English and held by 1 WorldCat member library worldwide

By considering the electron interactions in polyacetylene, it is found that there exist two gap states in charged solitons of trans- polyacetylene: one is deep level, and the other is shallow level. The deep one shifts 0.23 eV down (for a positive soliton) or up (for a negative soliton) from the center of the gap, while the shallow one is 0.06 eV under the bottom edge of the conduction band (positive soliton) or above the top edge of the valence band (negative soliton). These results agree with the absorption spectra of trans- polyacetylene. Other shallow states outside the energy bands are also predicted. Keywords: Polyacetylene; Polymers; Gap states; Charged solitons; Deep and shallow levels; Conduction and valence bands; Absorption spectra
Spontaneous Decay and Resonance Fluorescence of an Admolecule Near a Silver Surface with Random Roughness( Book )

1 edition published in 1990 in English and held by 1 WorldCat member library worldwide

The spontaneous decay rate and resonance fluorescence spectrum of a molecule adsorbed near a rough silver surface are calculated. An assumed random distribution of the roughness on the surface is treated as an effective layer. The calculated decay rate is in excellent agreement with experimental measurements. The effects of surface roughness on both the spontaneous decay rate and resonance fluorescence spectrum are discussed for different cases. Keywords: Spontaneous decay; Resonance fluorescence; Admolecule; Near silver surface; Random roughness. (JG)
Optical Phonon Modes in a Double Heterostructure of Polar Crystals( Book )

1 edition published in 1989 in English and held by 1 WorldCat member library worldwide

The equation of motion for the polarization vector for a double heterostructure of polar crystals is solved exactly within the framework of the continuum model. There exist only two types of phonon modes, the interface modes and the confined bulk modes, whose eigenvectors are obtained explicity. Dispersion relations are derived analytically for the interface modes, while the confined bulk modes are dispersionless, a fact consistent with the model. It is also found that in Raman scattering experiments, the symmetric interface modes are predominantly longitudinal (LO) and the antisymmetric interface modes transversal (TO). In the central region of the Brillouin zone, however, they both split into two branches oscillating at LO and TO frequencies, respectively. Possibly reinterpretation of various experiments are briefly discussed. (JHD)
Study of e-Beam Propagation in the Ionosphere and Magnetosphere by D. J Strickland( Book )

1 edition published in 1983 in English and held by 1 WorldCat member library worldwide

A two-dimensional (r, E) Monte Carlo electron transport model has been developed to study the energy deposition and spreading of kilovolt electron beams in the ionosphere. MCBE is the name of the computer code incorporating the model. The beam electrons scatter and lose energy through particle-particle interactions. These processes are treated by applying the Goudsmit-Saunder multiple scattering formula and assuming energy loss is continuous. Results have been obtained for several beam energies and some have been compared to the results of Berger, et al. (1970). We obtain excellent agreement in the altitude profile of energy deposition, but poor agreement in spreading. We find there to be less spreading along with a weaker dependence of this spreading on the starting beam electron energy. An analytic model has been developed to test the numerical results and contains the magnitude and weak dependence on beam energy of the observed spreading. This model has now been published with a copy of the reprint appearing at the end of this report. Another aspect of the work has been to investigate the effect of plasma turbulence on beam propagation
Electron Beam Transport in the Ionosphere - Energy Deposition and Optical Emissions Based upon the Combined Effects of Plasma Turbulence and Particle-Particle Interactions( Book )

1 edition published in 1982 in English and held by 1 WorldCat member library worldwide

The problem of electron beam propagation in the E-region is examined. A model is developed to describe that part of beam spreading due to plasma turbulence. The basis of the model is that the given turbulence can cause a series of effective displacements delta r(GC) of the beam electron guiding centers through a corresponding series of briefly experienced perpendicular components of the turbulent electric field. Weak turbulence theory is considered and applied to cases of warm and cold beams. A Monte Carlo code has been developed to follow the spreading of the beam electron guiding centers where delta r(GC) is given altitude dependence. An analytic expression is used when delta r(gc) is constant with altitude. The turbulence model is used to examine beam spreading as observed by Davis et al. (1971) and Hallinan et al. (1978). We can generally account for the observed amount of spreading by adding in the contribution due to particle-particle interactions. Optical properties associated with beam energy deposition are also modeled. Most features in the UV and visible portion of the optical spectrum are considered along with their emission efficiencies
Soft X-Ray Photoemission: Development of User Oriented Code SXRP and Its Application to Photoemission, Electron Backscatter, Charge Deposition and Energy Deposition( Book )

1 edition published in 1980 in English and held by 1 WorldCat member library worldwide

This work is a continuation of our program to characterize soft X-ray photoemission for various materials used in space systems. The code SXRP is developed specifically to achieve this goal. Results predicted by this code for X-ray line sources are compared with measurements in this report. General agreement is found between theory and experiments. To assist SGEMP analysts in modeling the electromagnetic environment of systems exposed to soft X-ray in simulation test, a user-oriented algorithm for choosing transport energy grid is successfully developed for code SXRP. Electron backscatter of Al and Au are investigated to further test the scattering model in code SXRP. Another investigation concerned charge and energy deposition in Teflon for incident soft electron sources. Both investigations demonstrate the capability of SXRP to treat external electron as well as X-ray sources. (Author)
Electron Interaction and Optical Gap of Conjugated Polymers( )

1 edition published in 1991 in English and held by 0 WorldCat member libraries worldwide

The controversy over whether the optical gap of a polymer is increased or decreased by the electron-electron interaction can be clarified by studying the effect of the screened Coulomb interaction on the correlation function of the excited states. Since the competition between the diagonal and off-diagonal parts of the electron interaction depends on the screening, the screening becomes the decisive factor in determining the dependence of the optical gap of the electron interaction. Our theory shows that the electron interaction with weak or usual screening increases the optical gap, but if the screening is very strong, the optical gap can be reduced by the electron interaction
Percolation Effects on the Decay of Admolecules( )

1 edition published in 1991 in English and held by 0 WorldCat member libraries worldwide

It is well known that, in a two-component particle composite material, the conductivity exhibits singular behavior near a percolation threshold, namely, a composition at which one of the constituents forms a connected path extending throughout the material. As an example, the effective conductivity of a composite material composed of metal and insulator particles varies as (q-q sub c) to the minus t power), near the metal percolation threshold q sub c, where q is the volume fraction of the metal and t is a characteristic exponent which remains to be determined. In addition to static properties, optical properties of the two--component composite material, both linear and nonlinear, have been extensively studied. In general, composite materials have optical properties very different from those of their constituents, especially in the vicinity of the percolation threshold. Effects of percolation on the energy transfer from an admolecule to a two-component granular composite substrate are investigated. The substrate material is a random mixture of a metal and an insulator non-absorptive to the light. The luminescence decay rate of the admolecule near the composite surface is calculated by means of the effective medium theory as a function of the volume fraction of the metallic granules. It is found that the decay rate is greatly enhanced around the dc conduction percolation threshold at low transition frequencies. For high frequencies, the decay rate peaks at a higher volume fraction of the metallic particles, indicating the existence of a 'bulk percolation' threshold
Squeezing of Many-Atom Radiation in an Optical Cavity( )

1 edition published in 1989 in English and held by 0 WorldCat member libraries worldwide

A method developed in terms of the SU(2) Lie algebra for the treatment of many-level atoms is now modified to treat the system of many two- level atoms interacting with a cavity field. Spectral attention is given to field squeezing up to fourth order. The effects of the number of atoms and detuning on the squeezing are investigated numerically for various initial field intensities. It is found that the atomic cooperation enhances the squeezing, while in the case of weak excitation, it weakens the squeezing. The possibility of constructing many-atom micromasers is suggested. In a micromaser, inversely populated atoms are injected one by one into an optical cavity to create stimulated emission. We suggest that a many-atom maser may be designed in which a group of active atoms instead of one is injected into the cavity at one time. If such many-atom micromasers are realized, it should be much easier to observe the field squeezing with strong initial excitation. It is known that a micromaser may be expected to produce low-noise microwave radiation. If the active medium consists of only one atom, its output power is too small to be useful for any practical purpose. If, however, the active medium consists of a group of atoms, or a large number of atoms is allowed to pass the cavity at one time, the output power of the micromaser will be greatly increased
Effects of Electron-Interface-Phonon Interactions on Magnetopolaronic Impurity Transitions in Quantum Wells( )

1 edition published in 1992 in English and held by 0 WorldCat member libraries worldwide

Electron interactions with interface phonon modes and strictly- confined bulk phonon modes are considered for the first time to calculate the magnetopolaronic effect on the transition energy of a hydrogenic impurity in the quantum well of a double heterostructure. The electron-phonon interaction is treated as a perturbation on a hydrogenic impurity confined in a quantum well under strong magnetic fields. The unperturbed states are obtained by the variational method with trial wave functions constructed on symmetry considerations. It is found that the transition energy, as a function of the applied magnetic field, breaks up into three branches with two interaction gaps occurring at two-level and three-level resonances. The lowest branch lies below the bulk TO energy. These results are found in good agreement with recent experimental data
Cooperative Effects on Transient Spectral Hole Burning( )

1 edition published in 1992 in English and held by 0 WorldCat member libraries worldwide

The nonlinear optical susceptibility is calculated for a system of two closely located bound excitons by treating the test field as a perturbation in pump-probe experiments. The coherence of the superradiance effect on the spectral hole burning is found to be dramatic in the transient regime for both on-resonance and off-resonance pumping
Interface-Phonon-Mediated Magnetopolaronic Effect on Impurity Transition Energies in Quantum Wells( )

1 edition published in 1991 in English and held by 0 WorldCat member libraries worldwide

Surface-Induced Optical Bistability in Coupled Exciton-Phonon Systems( )

1 edition published in 1990 in English and held by 0 WorldCat member libraries worldwide

Nonlinear optical responses of excitation-phonon-coupling systems near a reflective surface are investigated. For a polydiacetylene chain lying parallel to the surface, optical bistability induced by the surface is discovered. It is also found that the threshold and contrast of the bistability can be controlled by adjusting the distance of the system from the surface, and that vacuum fluctuations are reduced whenever the bistability occurs. The nature of the bistability and its origin are discussed. (Author) (TTL)
Frequency Dependence of Two-Photon Resonances and Damping in Polymers( )

1 edition published in 1991 in English and held by 0 WorldCat member libraries worldwide

For the two photon resonance in the third-harmonic generation (THG) spectrum of trans-polyacetylene, the existing theories can only qualitatively rather than quantitatively explain the experimental data. In this paper a damping mechanism is proposed. It shows that once the excitation-dependent damping is taken into account, the whole experimental spectrum of the THG can be quantitatively interpreted by our theoretical calculations
Dynamics of an M-Level Atom Interacting with Cavity Fields: Properties of Photon Statistics( )

1 edition published in 1989 in English and held by 0 WorldCat member libraries worldwide

For a system of an M-level atom interacting with cavity fields, the statistical properties of the field are investigated numerically. The variation of photon antibunching and probability distribution with the atomic level number and initial field intensity are discussed for both resonance and off-resonance cases
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