Now showing items 51-60 of 183
The Design of a Magnetic Focusing Coincidence Spectrometer
(The American Institute of Physics, 1950-08)
Design and operating features are described for a semi‐circular magnetic focusing coincidence spectrometer. The primary function of the spectrometer is that of determining whether or not two different radiations from a ...
I. Normal Frequencies of a One‐Dimensional Crystal. II. An Approximation to the Lattice Frequency Distribution in Isotropic Solids
(The American Institute of Physics, 1951-11)
I. The accurate expression for the individual frequencies of a linear crystal of any number of particles is derived.II. It is shown that, for an isotropic three‐dimensional array of uniform masses, the root‐mean‐square ...
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 ...
Infrared spectra of high polymers : Part IX. Polyethylene terephthalate
(Elsevier, 1959)
Infrared spectra of polyethylene terephthalate and three of its deuterated analogs have been obtained in the region of 70 to 3600 cm-1, polarized spectra having been obtained down to 330 cm-1. On the basis of analysis of ...
Kirchhoff-Youngsche Theorie der Beugung elektromagnetischer Wellen
(Springer-Verlag, 1958-04)
Der Youngschen Deutung der Beugungserscheinungen liegt die Vorstellung zugrunde, daß das Licht am Rand der beugenden Öffnung „eine Art von Reflexion“ erleidet. Für skalare Wellen läßt sich diese Auffassung streng aus der ...
Vibration‐Hindered Rotation Interactions in Methyl Alcohol. The J=0→1 Transition
(The American Institute of Physics, 1957-01)
The hindered rotation fine structure of the J=0→1, K=0→0 transition which has been observed by Venkateswarlu, Edwards, and Gordy in normal methanol as well as in five additional isotopic species can be understood only ...
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 ...
Spectra of Homologous Series of Monosubstituted Amides
(The American Institute of Physics, 1958-11)
Infrared spectra of the pure liquid and of dilute solution were observed for N‐methyl, N‐ethyl, N‐propyl, and N‐butyl acetamides and propionamides and of N‐deuterated N‐butylacetamide. Also infrared spectra of N15‐butylacetamide ...
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 ...