RSI Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

SECTION LISTING

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

Sep 1970

Volume 41, Issue 9, pp. 1275-1374

Page 1 of 2 Pages Next Page | Jump to Page

Extreme Ultraviolet Spectroscopy with the Use of a Storage Ring Light Source

Christian Gähwiller, Frederick C. Brown, and Hiizu Fujita

Rev. Sci. Instrum. 41, 1275 (1970); http://dx.doi.org/10.1063/1.1684793 (7 pages) | Cited 33 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
The 240 MeV storage ring at the Physical Science Laboratory of the University of Wisconsin has been used as a source of radiation for extreme uv spectroscopy in the 40–400 Å wavelength range. The characteristics of the synchrotron radiation emitted by this machine are summarized. The experimental setup with a 2 m grazing spectrometer and the data acquisition system is described along with some of the procedures used for thin film photoabsorption measurements.

Electron Multiplier Efficiency for Hydrogen Atom Detection

R. H. McKnight, D. H. Crandall, and D. H. Jaecks

Rev. Sci. Instrum. 41, 1282 (1970); http://dx.doi.org/10.1063/1.1684794 (2 pages) | Cited 5 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
The efficiency of an electron multiplier for detecting fast hydrogen atoms has been measured by a coincidence technique employing Lyman α photons from the induced decay of metastable hydrogen atoms. Results reported are for the energy range 3–20 keV.

Apparatus for Direct Recording of Magneto‐Optic Rotation and Magnetic Hysteresis

E. Sawatzky and D. H. Horne

Rev. Sci. Instrum. 41, 1284 (1970); http://dx.doi.org/10.1063/1.1684795 (7 pages) | Cited 8 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
The design and construction of an apparatus for domain observation and for the measurement of magneto‐optic rotation and coercivity of thin magnetic films, by means of the Faraday effect, are described. A spatial resolution of 5 μ is achieved, allowing scanning of magneto‐optic properties across the film. Gas flow cooling and heating of the samples result in a temperature range of −120 to +200°C. A special sampling detector allows continuous recording of magneto‐optic rotation and coercivity as a function of temperature and wavelength.

Hydrogen Maser With Deformable Storage Bulb

Pierre E. Debely

Rev. Sci. Instrum. 41, 1290 (1970); http://dx.doi.org/10.1063/1.1684796 (3 pages) | Cited 4 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
The value which most affects the accuracy of the hydrogen maser is the experimental determination of the frequency shift produced by the collision of the atoms with the surface of the storage bulb. In the current method of using different bulbs with various sizes in order to determine the frequency shift, a large amount of uncertainty is due to the unreproducibility of the FEP Teflon coatings from one bulb to another. A way to get rid of this error is to use a single deformable bulb whose volume can be changed while the same surface is retained. Such a bulb has been developed which can be adapted to any regular maser.

Application of Frequency Locking and Control to an Autodyne Oscillating NMR Detector

Leonard Brandwein and Max Lipsicas

Rev. Sci. Instrum. 41, 1293 (1970); http://dx.doi.org/10.1063/1.1684797 (3 pages) | Cited 1 time

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
The use of an autodyne oscillating NMR detector is discussed with particular reference to experimental situations where signal averaging or magnet field locking are involved. A frequency locking scheme which has proved very useful in this connection is described. Some additional circuits used in this locking scheme are discussed as applied to a Robinson circuit.

A Hot Wire Method for Low Velocity with Large Fluctuations

W. Z. Sadeh, P. F. Maeder, and S. P. Sutera

Rev. Sci. Instrum. 41, 1295 (1970); http://dx.doi.org/10.1063/1.1684798 (4 pages) | Cited 3 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
The theory of the hot wire anemometer is reviewed with emphasis on low velocity flow with relatively high turbulence intensity. A constant temperature linearized method is developed specifically for such measurements. Results for turbulence intensity as high as 90% are presented.

An Automatic Zero Suppression Circuit

D. Trigg

Rev. Sci. Instrum. 41, 1298 (1970); http://dx.doi.org/10.1063/1.1684799 (5 pages) | Cited 3 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
A practical technique is described for high sensitivity recording of input signals having a large dynamic range. The circuit senses when the input signal exceeds preset limits and applies a precise and stable baseline shift in the correct sense to maintain the output within these limits. The circuit may be regarded as a black box to be inserted between an analog signal source and a recording device and requiring no alteration to either. A system is presented in detail which permits recording of signals within the range −5.4 to +6.1 V on a recorder at 1.0 V full scale sensitivity. The drift introduced by this system is maintained at less than 1 mV∕°C over a wide ambient temperature range. A discussion of the sources of error is presented and techniques for reducing these errors are described.

NMR Stabilization of a Hall Effect Regulated Electromagnet

W. H. Wing, E. R. Carlson, and R. J. Blume

Rev. Sci. Instrum. 41, 1303 (1970); http://dx.doi.org/10.1063/1.1684800 (2 pages) | Cited 4 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
A Hall effect regulated electromagnet system can be locked to an NMR resonance by applying the NMR error signal to a small bias coil on the field sensor. The method requires no modification of the magnet regulator circuitry, produces negligible inhomogeneity near the center of the magnet, and reduces long term field drift to less than 1 mG if the NMR frequency is crystal controlled.

Technique for the Study of Highly Attenuated Ultrasonic Waves in Gases

J. G. Miller and D. I. Bolef

Rev. Sci. Instrum. 41, 1305 (1970); http://dx.doi.org/10.1063/1.1684801 (2 pages) | Cited 1 time

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
The sampled‐cw ultrasonic technique is applied to the study of highly attenuated waves in gases. Phase velocity and attenuation are obtained from a measurement of the reflection coefficient at the solid‐gas interface of a gas‐immersed crystal resonator.

Anemometer Linearizer with Reverse Curvature Capability

G. T. Skinner and R. J. Hiemenz

Rev. Sci. Instrum. 41, 1307 (1970); http://dx.doi.org/10.1063/1.1684802 (6 pages) | Cited 1 time

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
A biased silicon transistor chain is used as the heart of a temperature stable circuit which will linearize the usual range of power law characteristics of hot wire and thin film constant temperature anemometers. In addition, this device can be used for characteristics which include segments with reverse curvature, a feature which has been found in some probes used to measure blood flow velocities in the aorta.

A Combined Differential Thermal Analysis and Spectrophotometric Cell

C. H. Griffiths and M. S. Walker

Rev. Sci. Instrum. 41, 1313 (1970); http://dx.doi.org/10.1063/1.1684803 (3 pages) | Cited 3 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
A high temperature optical cell which allows simultaneous monitoring of thermally induced transformations by differential thermal analysis has been designed and constructed. The α → β phase transformation in both evaporated thin films and bulk phthalocyanine has been studied with the cell and transformation rates determined. The rate constants were approximately three orders of magnitude larger for the bulk sample than for the evaporated films.

A Microwave Frequency Marginal Oscillator for Electron Spin Resonance

W. M. Walsh and L. W. Rupp

Rev. Sci. Instrum. 41, 1316 (1970); http://dx.doi.org/10.1063/1.1684804 (3 pages) | Cited 8 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
A compact, inexpensive, and surprisingly sensitive microwave frequency ESR spectrometer has been developed. A Gunn diode placed directly in the sample cavity and operated near the threshold of oscillation is the central feature of the unit.

Improvements in an Electron Microscope for Clean, Quiet, Vibrationless Operation

R. B. Marcus, C. J. Calbick, and T. T. Sheng

Rev. Sci. Instrum. 41, 1319 (1970); http://dx.doi.org/10.1063/1.1684805 (5 pages) | Cited 3 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
A new vacuum system has been designed and constructed for a Siemens Elmiskop I electron microscope in order to provide a cleaner environment about the specimen during normal use of the instrument, and to prepare the instrument for the addition of an ultrahigh vacuum specimen chamber for in situ film growth studies. Liquid nitrogen sorption pumps are used on the upper and lower parts of the microscope column, and an Orb‐Ion pump is used to pump differentially on the large Siemens specimen chamber (with airlock). An impedance tube at the top and an impedance aperture at the bottom of the specimen chamber restrict the gas flow rate into the chamber to 7.04×10−3 liter∕sec. Under operating conditions the pressure in the upper and lower parts of the microscope is <2×10−5 Torr, the (large Siemens) specimen chamber pressure is <2×10−6 Torr, the hydrocarbon contamination rate is ∼0.7 Å∕min, the specimen changing time is 2 min, and the plate changing time is 4 min. The corresponding figures in the original unmodified microscope are ∼2×10−4 Torr, ∼2×10−4 Torr,∼ 500 Å∕min, 1 min, and 4 min. Further advantages are noiseless and vibrationless operation.

A Simply Constructed Proton NMR Probe for High Field Super‐conducting Solenoid Calibration

Seppo O. Sari and Thomas R. Carver

Rev. Sci. Instrum. 41, 1324 (1970); http://dx.doi.org/10.1063/1.1684806 (3 pages) | Cited 1 time

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
A proton nuclear resonance probe for high field calibration of room temperature access superconducting solenoid fields is described. The probe may be made in a simple fixed‐tuned version, or a tunable version to cover the range from about 40 to 70 kG. Such a probe has the advantage that it may be used on the end of a long probe stem, may be made quite small if necessary, has a high Q, may be used to calibrate homogeneity and persistence easily, may be tested prior to use with DPPH, and may be constructed in just a few hours. The probe can be adapted to use at liquid helium temperatures utilizing 3He samples.

Electronic Correction of Digitizer Errors

M. J. LeVine and R. L. Chase

Rev. Sci. Instrum. 41, 1327 (1970); http://dx.doi.org/10.1063/1.1684807 (3 pages)

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
An electronic system that provides for the unambiguous reading of simple mechanical shaft angle digitizers is described. The system is virtually insensitive to contact bounce, to bridging between adjacent contacts, and to the errors that can occur when several contacts change state at the same time. The system is based upon repetitive comparisons between the last valid reading and the current digitizer state. The output is updated only when the input is found to be unambiguous.

A Microstrip Line Stretcher

Robert A. Hoffswell

Rev. Sci. Instrum. 41, 1330 (1970); http://dx.doi.org/10.1063/1.1684808 (2 pages)

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
A simple and inexpensive microstrip transmission line of adjustable length is described. The device, although physically considerably smaller, is electrically similar to the usual coaxial line stretcher and can be fabricated easily from standard printed circuit or microstrip boards.

Arc Welding Generators Used as Air Core Magnet Power Supplies

J. E. Cato, J. E. Hipp, M. Kristiansen, and M. O. Hagler

Rev. Sci. Instrum. 41, 1332 (1970); http://dx.doi.org/10.1063/1.1684809 (2 pages)

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
An experimental study has shown that dc arc welding generators can be used satisfactorily as an inexpensive power source for large magnet systems. A 120 Hz load current ripple of only 0.05% rms was measured at one‐half load and decreased for heavier loads. Random low frequency current fluctuations of ⪞3% peak‐to‐peak were detected but were reduced to ⪝0.5% peak‐to‐peak with a feedback technique.

Production and Focusing of a High Power Relativistic Annular Electron Beam

M. Friedman and M. Ury

Rev. Sci. Instrum. 41, 1334 (1970); http://dx.doi.org/10.1063/1.1684810 (2 pages) | Cited 53 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
A new electron beam injection gun has been developed to produce pulsed relativistic electron beams with a power of 1010 W. The annular shaped beam propagates in a magnetic field with efficiencies approaching 100% and its radius may be controlled by the magnetic field configuration.

Sampling and Synchronous Detection for Studying Fast Low Intensity Light Signals

S. Benci, P. A. Benedetti, and M. Manfredi

Rev. Sci. Instrum. 41, 1336 (1970); http://dx.doi.org/10.1063/1.1684811 (4 pages) | Cited 16 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
Superimposed modulation and lock‐in techniques have been successfully applied in order to minimize statistical fluctuations and to eliminate the low frequency internally generated noise in a sampling apparatus for fast, repetitive light signals detection. Some improvements are suggested here for applying the described technique to the study of ir fast light pulses, by means of electro‐optical sampling.

A Device for the Production of an Extended Homogeneous Field‐Free Spherical Plasma

A. C. de Hoog and L. Schott

Rev. Sci. Instrum. 41, 1340 (1970); http://dx.doi.org/10.1063/1.1684812 (3 pages) | Cited 8 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
A new plasma source has been designed and tested which is capable of producing a stationary, quiescent spherical diffusion plasma of 69 cm diameter. This plasma is free of electric currents, and the electric fields in it can be kept below 10 mV∕cm. Electron temperatures between 103 and 3×103 K and plasma densities between 108 and 1010 cm−3 were measured with a Langmuir probe in the pressure range 0.1–10−4 Torr. Radial variations of the plasma density smaller than 10% over about two thirds of the plasma radius were observed in argon at pressures between 10−2 and 10−4 Torr.

Free Vibrating Reed Apparatus for the Measurement of Internal Friction and Young's Modulus down to 4 K

R. Buchdahl, R. J. Morgan, and L. E. Nielsen

Rev. Sci. Instrum. 41, 1342 (1970); http://dx.doi.org/10.1063/1.1684813 (3 pages) | Cited 7 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
This paper describes in detail a freely vibrating reed apparatus which we have developed to study these low temperature dynamic mechanical properties of polymers (at approximately 5 cps). The apparatus is capable of measuring these properties from 4 up to 340 K. This method has the advantage over other methods of being relatively easy to set up and may be modified so more than one specimen can be investigated in a given temperature run. In addition measurements on the logarithmic decrement and Young's modulus of polystyrene are presented and compared with previous data.

Ultrahigh Vacuum Twist Compression Apparatus

J. M. Bradford, K. B. Wear, and M. E. Sikorski

Rev. Sci. Instrum. 41, 1345 (1970); http://dx.doi.org/10.1063/1.1684814 (3 pages)

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
A new apparatus is described which is used for bonding of metals in ultrahigh vacuum by the twist compression technique. It is shown that adhesion between hard metal specimens can be readily measured in ultrahigh vacuum after some initial mechanical abrasion of the surfaces, while adhesion tests in air at atmospheric pressure do not yield measurable adhesion coefficients. Experimental results are reported on the coefficients of adhesion and friction obtained for an atomically ordered platinum‐cobalt alloy.

A High Current, Subnanosecond Response Faraday Cup

D. Pellinen

Rev. Sci. Instrum. 41, 1347 (1970); http://dx.doi.org/10.1063/1.1684815 (2 pages) | Cited 20 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
A subnanosecond risetime, milliohm resistance Faraday cup was designed and tested for measuring fractional megampere electron beams from pulsed electron accelerators. The device has been typically operated at electron beam currents of 60 kA with an average electron kinetic energy of 4 MeV. Under short circuit conditions the device has measured currents exceeding 0.25 MA.

A Multichannel Monitor for Repetitive Auger Electron Spectroscopy with Application to Surface Composition Changes

E. N. Sickafus and A. D. Colvin

Rev. Sci. Instrum. 41, 1349 (1970); http://dx.doi.org/10.1063/1.1684816 (6 pages) | Cited 6 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Show Abstract
A multichannel monitor has been designed to shorten the effective scanning time of Auger electron spectroscopy. The circuitry of the multichannel monitor is described with specific reference to its application to the second derivative curve of a retarding potential analyzer. By adopting the monitor to a retarding potential analyzer of a LEED system, sufficiently fast response time has been obtained to permit various kinds of surface kinetics to be monitored. By way of illustrating the use of the monitor, results are given of surface composition changes on the Ni(110) surface that accompany heating subsequent to adsorption at room temperature. It was found, for example, that surface carbon may cover surface sulfur and, consequently, on heating the latter suddenly appears as a result of the removal of carbon. In this manner the nature of surface sites occupied by various surface species can be characterized. And by monitoring the kinetics specific activation energies may be determined.
back to top
RSS Feeds

Improvements on Pulse Superposition Velocity Measurements

J. Holder

Rev. Sci. Instrum. 41, 1355 (1970); http://dx.doi.org/10.1063/1.1684817 (2 pages) | Cited 16 times

Online Publication Date: 11 November 2003

Full Text: | Download PDF

Abstract Unavailable
Page 1 of 2 Pages Next Page | Jump to Page
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close