Varian Associates

About: Varian Associates is a based out in . It is known for research contribution in the topics: Beam (structure) & Wafer. The organization has 2160 authors who have published 2591 publications receiving 46002 citations.

Photoluminescence characterization of solution and lec grown InP

Abstract: Low temperature photoluminescence and electrical measurements on bulk grown polycrystalline and single crystal InP indicate the purity and crystal perfection to be equivalent to that of LPE and VPE samples

Gyromagnetic apparatus employing computer means for correcting its operating parameters

Abstract: A gyromagnetic resonance spectrometer is disclosed which employs a computer for correcting its operating parameters. The gyromagnetic resonance spectrometer includes means for exciting and detecting gyromagnetic resonance of a sample of matter to be investigated in a polarizing magnetic field. The output spectral data from the spectrometer are fed to a computer. The computer includes a memory and a logic unit programmed to process the data stored in the memory according to a pre-determined program. The computer includes programs for causing certain resonance determinative operating parameters of the spectrometer to be varied in certain ways to cause the output spectral data of the spectrometer to vary accordingly. The spectral data are stored in the memory of the computer and the computer processes the stored data to derive certain corrective outputs which are fed from the computer to the spectrometer for correcting the operating resonance determinative parameters of the spectrometer to yield corrected resonance spectral data. The computer may be programmed to correct any one or more of the following operating parameters of the spectrometer: field strength and homogeneity of the polarizing magnetic field, phase and/or frequency of radio frequency resonance exciting field, intensity of the radio frequency resonance exciting field, rate at which the gyromagnetic ratio is swept in the spectrometer to obtain output spectral data, time constants of filter circuits employed in the receiver of the spectrometer, frequencies and intensities of radio frequency energy applied to the sample in performing certain double resonance analysis, sample spinning rate for averaging gradients of the polarizing field, and intensity of the polarizing magnetic field. The computer may use any one of a number of different methods for deriving the corrective outputs for correcting the operating parameters of the spectrometer.

Scintillation Processes in Thin Films of CsI(Na) and CsI(Tl) due to Low Energy X-rays, Electrons and Protons

Abstract: Publisher Summary This chapter focuses on scintillation processes in thin films of CsI(Na) and CsI(Tl) because of low energy x-rays, electrons, and protons. The use of CsI(Na) and CsI(T1) as scintillator materials of high efficiency for charged and uncharged particles has been reported in the past. Usually, this work has been performed on bulk samples. This chapter reports for the first time measurements made on thin films of these materials varying in thickness from 5000 Ǻ to 0.25 mm, deposited on glass, aluminum, and plastic substrates. The host crystal (CsI) is transparent to the impurity emission for both the thallium-activated material and the sodium-activated material, having an absorption edge at 2000 Ǻ so that self-absorption is small and thus the luminescent efficiencies are determined solely by the processes of excitation and emission. The experimental results obtained demonstrate that it has been possible to produce thin films of CsI(Na) and CsI(Tl) which fluoresce with the same efficiency as the bulk materials. The ease with which these materials may be prepared in thin film form and their ability to perform satisfactorily in various environments suggests a wide range of applications in photoelectronic devices.

Hydraulic pulse dampener employing stiff diaphragm and nesting member

Abstract: A hydraulic pulse dampener of liquid compressibility type has a flexible tubing wound around a form within a liquid-tight housing filled with a compressibility liquid and a stiff diaphragm placed adjacent a recess formed in a receiving member. As the fluid flowing inside the tubing experiences pressure pulses, the walls of the tubing expand and transmit the pulse energy through the compressibility liquid and causes the diaphragm to gradually flex towards the recess until it may completely nest in it. The recess in the receiving member preferably has a central flat portion so that the flexing diaphragm will first contact the receiving member at the center and the nesting will spread outwardly therefrom.