Now showing items 1-10 of 19
Electronic Spectra of Polyacetylenes
(The American Institute of Physics, 1956-10)
The low‐temperature emission spectra in rigid glass solutions of several substituted polyacetyelnes have been investigated. All the compounds phosphoresced with decay lifetimes ranging from 0.01 to 0.3 second. None of the ...
Stretching Force Constant of the Carbonyl Bond in Unconjugated Ketones
(The American Institute of Physics, 1956-04)
The secular equation derived for the normal frequencies of a Y‐shaped C2CO model can be used with fair accuracy to obtain the carbonyl bond force constant from the measured carbonyl frequency of any symmetrical ketone if ...
Beta Gauge for Localized Measurements on Thin Films
(The American Institute of Physics, 1956-06)
Infrared Spectra of High Polymers. I. Experimental Methods and General Theory
(The American Institute of Physics, 1956-09)
The problems involved in obtaining and interpreting the infrared spectra of high polymers are discussed. Experimental methods are described for recording the infrared spectrum, with particular emphasis on the techniques ...
Transit‐Time Accelerometer
(The American Institute of Physics, 1956-06)
An omnidirectional transit‐time accelerometer, developed for measuring the drag acceleration of spheres dropped from rockets, is described. The ambient density and temperature of air may be calculated from the drag ...
Infrared Spectra of High Polymers. III. Polytetrafluoroethylene and Polychlorotrifluoroethylene
(The American Institute of Physics, 1956-09)
The infrared spectra of polytetrafluoroethylene and polychlorotrifluoroethylene have been obtained between 4000 cm—1 and 70 cm—1. Polarization measurements on oriented samples were obtained in the region of 4000 cm—1 to ...
Mounting of Stained Stripping Film Autoradiographs
(The American Institute of Physics, 1956-11)
Upper‐Air Density and Temperature by the Falling‐Sphere Method
(The American Institute of Physics, 1956-07)
Upper‐atmosphere air densities and temperatures have been calculated from the measured trajectory data of a falling sphere. Densities were calculated from the equation for the drag force on the falling sphere, and temperatures ...
Cyclotron Instrumentation for Nuclear Spectroscopy at Medium Resolution in Energy
(The American Institute of Physics, 1956-07)
The instrumentation for the magnetic focusing and analysis of the external beam of the Michigan cyclotron is described. It provides to a scattering chamber in an adjacent room a beam of deuterons of a few tenths microampere ...
Variational Method for the Calculation of the Distribution of Energy Reflected from a Periodic Surface. I.
(The American Institute of Physics, 1956-04)
A variational method is presented which is used to calculate the energy appearing in the various diffracted orders set up when a plane wave is incident upon a periodic reflecting surface. Either the first or the second ...