Now showing items 291-298 of 298
Design of a pulsed valve for high‐pressure NH3 injection into supersonic beam/mass spectrometry
(The American Institute of Physics, 1988-11)
A novel design of a pulsed valve for high‐pressure injection of NH3 for supersonic jet expansions is presented. This valve can operate up to 200‐atm reservoir pressure at 180 °C with a pulse width down to 100 μs. This valve ...
Exciton percolation I. Migration dynamics
(The American Institute of Physics, 1976-10-01)
The exciton transfer, via migration and trapping, in binary and ternary mixed crystals is formulated in terms of percolation theory and the cluster structure for binary randomly mixed crystals. An important limiting case ...
Thermo-optical spectroscopy of low temperature solids
(Elsevier, 1977-07-01)
A discussion of an experimental procedure for determining the absorption spectra of low temperature solids by thermo-optical spectroscopy is presented. The method may be extended to the direct measurement in low temperature ...
Pulsed laser desorption method for volatilizing thermally labile molecules for supersonic jet spectroscopy
(The American Institute of Physics, 1988-04)
A technique using pulsed laser desorption is described as a means of volatilizing nonvolatile and thermally labile molecules into the gas phase for entrainment in supersonic jet expansions. By carefully controlling the ...
Molecular Freedom of the Ammonium Ion. Heat Capacity and Thermodynamic Properties of Ammonium Perchlorate from 5°–350°K
(The American Institute of Physics, 1969-06-15)
The heat capacity of NH4ClO4 has been determined by adiabatic calorimetry from 5°–350°K and found to be of simple sigmate character without thermal anomalies. The heat capacity (Cp)(Cp), entropy (S°)(S°), enthalpy function ...
Thermodynamics of Nonstoichiometric Nickel Tellurides. II. Dissociation Pressures and Phase Relations of Tellurium‐Rich Compositions
(The American Institute of Physics, 1958-10)
Dissociation pressures of tellurium over liquid and solid nickel telluride solutions have been measured with a silica Bourdon gauge at compositions corresponding to NiTe1.5, NiTe1.7, NiTe1.9, NiTe2.0, and NiTe9 at temperatures ...
Ultrafast time-resolved photoluminescence from novel metal–dendrimer nanocomposites
(The American Institute of Physics, 2001-02-01)
We report the first results of ultra-fast enhanced light emission from gold– and silver–dendrimer nanocomposites. There is a fast (70 fs) fluorescence decay component associated with the metal nanocomposites. Anisotropy ...
Thermal Properties Based upon Heat Capacity and Decomposition Pressure of Tetramethylammonium Hydrogen Dichloride. Nature of the Hydrogen Bond in the [Cl☒H☒Cl]— Ion
(The American Institute of Physics, 1962-05-15)
The heat capacity of tetramethylammonium hydrogen dichloride was determined from 5° to 350°K by adiabatic calorimetry and the derived thermodynamic properties were calculated. No thermal anomalies were found. Molal values ...