1 - 25 of 9
| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |
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Williams, Clayton C. | High resolution photothermal laser probe | At frequencies near 1 GHz, the acoustic wavelength in argon gas becomes half that of visible light, making possible collinear Bragg scattering of laser light by the sound. This acousto-optic interaction has been used to detect photothermally generated acoustic power at the surface of solids. This ne... | Photothermal laser probe; Silicon wafer | 1984 |
| 2 |
 |
Wu, Yong-Shi | Massless fermions and Kaluza-Klein theory with torsion | A pure Kaluza-Klein theory contains no massless fermion in four-dimensional theory. We investigate the effect of introducing torsion on the internal manifold and find that there are massless fermions. The hope is that given an isometry group the representation to which these fermions belong is fixe... | Massless fermions; Four-dimensional theory; Torsion | 1984 |
| 3 |
 |
Ailion, David Charles | Molecular reorientations in the ordered phases of KCN and NaCN studied by NMR | We have measured 13C and 23Na NMR spin-lattice relaxation times as a function of temperature in KCN and NaCN in order to study the head-to-tail reorientations of the CN- molecules in the two low-temperature ordered phases. We have combined our data with those of dielectric-response and ionic-thermal... | Spin; Interactions; Fluctuations | 1984 |
| 4 |
 |
Mattis, Daniel C. | Phonon model of vacancy-interstitial pair formation in solids | Bonds between neighboring atoms in a solid are imperfect harmonic oscillators. Through consideration of the nonlinearities, it is shown that vacancy-interstitial defect pairs can be described in terms of phonon dynamical variables. The effective spring constants are determined by self-consistency... | Harmonic; Potential; Homogeneous | 1984 |
| 5 |
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Vardeny, Zeev Valentine | Photoconductivity and photoinduced absorption in a-Si:F and a-Si:H | The photoconductivity (PC) and photoinduced absorption (PA) of RF glow discharge a-Si:F and a-Si:H samples is reported. The value of the room temperature PC of a-Si:F is lower by some four orders of magnitude relative to that of a-Si:H, but the PA of a-Si:F is found to be significantly higher than t... | Photoinduced absorption; a-Si:F; a-Si:H; RF glow discharge; Spin densities | 1984 |
| 6 |
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Vardeny, Zeev Valentine | Photoinduced absorption spectra in amorphous Si:H and Ge:H and microcrystalline Si:H | The steady state subgap photoinduced absorpotion bands in a-Ge:H and a-Si:H are interpreted in terms of two kinds of optical transitions of photoexcited carriers from traps in the gap into the bands of which one produces absorption and the other produces bleaching. The photoinduced absorption in mic... | Photoinduced absorption; Si:H; Ge:H; Amorphous silicon; Amorphous germanium; Microcrystalline silicon | 1984 |
| 7 |
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Vardeny, Zeev Valentine | Picosecond optical generation and detection of phonon waves in a-As2Te3 | Using the pump and probe technique we have observed oscillations of photoinduced transmission in thin films of a-As2Te3. The oscillations have periods of 70-240 ps, depending on sample thickness. We ascribe these to phonon propagation in the films. Thermal expansion and carrier deformation potenti... | Picosecond optical generation; a-As2Te3; Pump and probe technique | 1984 |
| 8 |
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Mattis, Daniel C. | Three-body bound states on a lattice | The theory of three-body bound states for particles moving on a lattice and interacting with attractive two-body pointlike potentials is presented. The applications are to bosons, fermions (no three-body bound states are found), and magnons. When a three-body bound state forms in three dimensions, i... | Particle; Fermions; Ferromagnet | 1984 |
| 9 |
 |
Mattis, Daniel C. | What is the effective mass of an exciton? | In the effective-mass approximation, the mass M* of an exciton is just the sum of the electron and hole masses, me*+ mh*. However, the effective-mass approximation is invalid if the forces are strong. Here we derive a plausible formula for the n th bound state of the exciton: Mn*= (me* + mh*) / (... | Kinetic; Energy; Electron | 1984 |
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