WorldCat Identities

Ancker-Johnson, Betsy

Overview
Works: 32 works in 37 publications in 1 language and 57 library holdings
Genres: Conference papers and proceedings 
Roles: Author
Classifications: KF3147.A7,
Publication Timeline
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Most widely held works about Betsy Ancker-Johnson
 
Most widely held works by Betsy Ancker-Johnson
U.S. technology policy : a draft study by Betsy Ancker-Johnson( Book )

3 editions published in 1977 in English and held by 10 WorldCat member libraries worldwide

US/USSR technology licensing prospects : summary report by U.S. Delegation Visit to the U.S.S.R. for Study of Soviet Management and Licensing Practices( Book )

1 edition published in 1973 in English and held by 7 WorldCat member libraries worldwide

Proceedings of the East-West Technological Trade Symposium by East-West Technological Trade Symposium( Book )

2 editions published in 1976 in English and held by 5 WorldCat member libraries worldwide

Plasmas in semiconductors and semimetals : [a review] by Betsy Ancker-Johnson( Book )

1 edition published in 1964 in English and held by 2 WorldCat member libraries worldwide

Microwave emission from nonequilibrium plasmas in insb subject to magnetic fields by Betsy Ancker-Johnson( Book )

2 editions published in 1967 in English and held by 2 WorldCat member libraries worldwide

The paper draws together a large amount of experimental information obtained by others as well as the author. Out of the maze of conflicting, at best, and contradictory, at worst, results, one set of consistent characteristics of the emission and its associated phenomena results. The reconciliation is obtained by means of a theory for the spatial distribution of plasmas during emission. It shows why some samples emit preferentially for B parallel to E, others for B perpendicular to E, and still others for intermediate orientation. The theory also clarifies the various observed threshold dependencies. The conflicting results concerning the spectral characteristics of the emission are attributed to faulty experimental techniques. Thus four characteristics of the emission and its associated phenomena are clearly described qualitatively, the spectrum, the polar dependencies, the sometimes attendant MHz resistance oscillations, and the threshold dependencies on E and B
AN INTRODUCTION TO ELECTRON-HOLE PLASMAS( Book )

1 edition published in 1970 in English and held by 2 WorldCat member libraries worldwide

The document contains two invited lectures given at the UCLA summer course on experiments and theory, June 15-26, 1970. Contents include the Introduction, Nonequilibrium plasma production, Sausage mode (m=0) instability, and Feedback control of m=0 oscillations
US/USSR technology licensing prospects, 1973 by United States( Book )

1 edition published in 1973 in Undetermined and held by 2 WorldCat member libraries worldwide

Magnetoconductance of nonequilibrium plasmas in insb by Betsy Ancker-Johnson( Book )

2 editions published in 1967 in English and held by 2 WorldCat member libraries worldwide

The conductance of injected and impact-ionized plasmas in p-InSb at 77 degrees K has been measured as a function of amplitude and direction of magnetic field relative to the electric field strength. Very large anisotropy in magnetoconductance occurs as the relative orientation between electric and magnetic fields is varied, and in the vicinity of the maxima large amplitude conductance oscillations develop with a frequency in the tens of MHz range. The plasma magnetoconductance for given magnitudes of applied fields abruptly drops to zero at a precisely defined orientation theta between the fields. Impact-ionized plasmas produce current-field strength characteristics with negative resistance re-ions both in the presence and absence of magnetic fields. These effects are qualitatively explained
Production of nonequilibrium plasmas in indium antimonide( Book )

1 edition published in 1969 in English and held by 2 WorldCat member libraries worldwide

Electrons and holes in excess of their thermal equilibrium density are generally produced in a semiconductor by one (or more) of these three means: (1) electrical injection, (2) optical injection, or (3) impact ionization. If the excess carrier density so produced is large compared with the recombination center density, a 2-component, electron-hole plasma results which is analogous to an electron-ion plasma. The work described here is motivated by the desire to obtain a fundamental understanding of electron-hole plasmas in their transient state and nonequilibrium steady-state. (Author)
THE RELATIONSHIP BETWEEN MICROWAVE EMISSION FROM InSb WITH AND WITHOUT MAGNETIC FIELDS( Book )

1 edition published in 1969 in English and held by 1 WorldCat member library worldwide

The paper contains observations which show the relationship between emission produced with and without applied magnetic fields. The results support the 'surface relaxation' model of emission. (Author)
Nonlinear Phenomena in Semiconductors through Multi-Photon Absorption( Book )

1 edition published in 1972 in English and held by 1 WorldCat member library worldwide

;Contents: Production of plasma by two photon absorption of CO2 - laser light in InSb; Conductivity vs. laser intensity; Cross-section for two-photon absorption; Time decay and spatial dependence of the plasma density; Heating of the plasma; Measurement of minority carrier mobility; Surface recombination; Recombination radiation; Transmitted vs. incident light; Pulse shaping of the laser beam
Electron-hole plasma density measurements( Book )

1 edition published in 1967 in English and held by 1 WorldCat member library worldwide

A diagnostic tool to determine the spatial and temporal distribution of nonequilibrium electron-hole plasma has been made utilizing a N2-CO2 cw laser and a Cu-doped Ge detector. Measurements of distribution have been made on an injected and subsequently pinched plasma contained in p-InSb at approximately 77 degrees K. The results show that the method has excellent spatial and time resolution. (Author)
University-industry interactions by American Institute of Physics( Recording )

1 edition published in 1973 in English and held by 1 WorldCat member library worldwide

Speakers include: Betsy Ancker-Johnson, "The Role of Government in Providing Support to Industry and Academic Institutions;" Richard Nelson, "The Role of High Technology in Industrial Growth;" J. Ross Macdonald, "Physics Education for Technological Growth;" William Havens, "New Energy Technology (Based on American Physical Society Energy Study);" and Rudolf Kompfner, "Optical Communication."
Women in science by Dinah L Moch( Recording )

1 edition published in 1975 in English and held by 1 WorldCat member library worldwide

Audio and video series of women in science created by the American Association of Physics Teachers; subjects include Betsy Ancker-Johnson, Chien-shiung Wu, Gwendolyn Albert, Carolyn Leach, Virginia Trimble, Diana McSherry, and Physics and Astronomy: Careers for Women
INJECTED PLASMAS IN INDIUM ANTIMONIDE IN THE PRESENCE OF LONGITUDINAL MAGNETIC FIELDS( Book )

1 edition published in 1962 in English and held by 1 WorldCat member library worldwide

Hysteresis in stability conditions of electronhole plasma( Book )

1 edition published in 1963 in English and held by 1 WorldCat member library worldwide

The investigation of the hysteresis occurring in the threshold conditions for the helical instability oscillations in electron-hole plasma has been extended. The hysteresis in electric field strength E can exceed 45 V/cm and 50% of the applied E at threshold. By determining the stability-instability boundary in p-InSb as a function of the parallel (or anti-parallel) electric and magnetic field strengths and also the plasma denstiy, the magnetic field induced by the formation of the helical density perturbation is deduced. Resulting displaced loop B-H curves are presented. (Author)
Proceedings of the East-West Technology Trade Symposium : November 19, 1975, Washington, D.C. by East-West Technological Trade Symposium( Book )

1 edition published in 1976 in English and held by 1 WorldCat member library worldwide

Nanosecond risetime, high power, variable delay double pulser with application to electron-hole plasmas( Book )

1 edition published in 1967 in English and held by 1 WorldCat member library worldwide

A new double pulse system has been designed and tested which offers several advantages over previous methods of generating and delaying one squarewave pulse with respect to another. Characteristics of the new system are, fast rise and fall times (2 nanoseconds typical); high power pulses (150 V into 50 ohms); very low time jitter (less than 0.2% of pulse separation time); accurate repeatability of time delay plus or minus 1% typical); extremely wide range of time delay (nanoseconds to milliseconds); d.c. readout of the time separation of the two pulses accurate to plus or minus 1% and suitable for x-y pen recorders. A special summing junction circuit allows both pulses to be applied to the same load without power being split between the load and the other pulse generator, and also without the first pulse prematurely triggering the second pulse or affecting its amplitude. Some results obtained by applying this system to the study of electron-hole plasma decay are briefly presented. (Author)
Plasma effects in semiconductors by Betsy Ancker-Johnson( Book )

1 edition published in 1968 in English and held by 1 WorldCat member library worldwide

The review begins with a survey of nonequilibrium plasma production methods and the properties of such plasmas in their as-produced state. The methods are injection, impact ionization, and two-photon absorption. The description of the as-produced properties includes previously unpublished information about plasma distribution during injection and characteristic times involved in plasma decay. Two plasma effects, beyond those associated with plasma production, are discussed in detail, namely the pinch effect and microwave radiation. The status of the theories and experiments describing pinch formation and its properties thereafter are critically examined so that the open questions emerge. No theory for microwave radiation exists. The plethora of observations are grouped into four sets of characteristics: the threshold conditions, the spectrum of the radiation, its polar dependence, and the attendant low frequency (MHz) resistance oscillations. Recent experiments show that a magnetic field is not essential for emission, and some simple, reasonable arguments about the role of a magnetic field in producing radiation, if true, reconcile the conflicting reports concerning the four sets of characteristics. (Author)
Lifetimes of nonequilibrium carriers in magnetic traps( Book )

1 edition published in 1964 in English and held by 1 WorldCat member library worldwide

Nonequilibrium electrons and holes in approximately equal density are produced in p-InSb at 77 K by forcing a current greater than ohmic through the sample. The density decays exponentially after an initial rapid decay occurring in <or equivalent to 200 nsec. The lifetime in the exponential region is 0.92 = 0.05 microsecond in the nonequilibrium carrier density range 0.9 to 2.1 x 10 to the 13th power cm to the -3rd power when no magnetic fields are applied. The excess carrier density in the presence of a magnetic trap compared with that in its absence after a given decay time is observed to be enhanced by as much as 65%. The trap configuration used in these measurements is achieved by superposition of three static fields: (A) a uniform axial one, H sub a; (B) a symmetric non-uniform axial field emanating from two current coils located one each in the planes of the sample ends, H sub em, where em signifies 'end mirror'; (C) an axially symmetric transverse field in the form of a quadrupolar cusp, H sub wm, where wm signifies 'wall mirror'. (Author)
 
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Alternative Names
Johnson, Betsy Ancker-

Languages
English (26)