ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    On the complete basis of Pauli-allowed states of three-cluster systems in the Fock–Bargmann space (1995)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 36 (1995), S. 4571-4589 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: In the Fock–Bargmann space, the complete harmonic-oscillator basis for the three-cluster system is constructed. The indices of the reduction U(6)&supuline;U(2)×U(3) are chosen as the quantum numbers. The Pauli-forbidden states are eliminated by the orthogonal transformation of basis functions. The basis states are obtained in terms of hypergeometric functions and the spherical Wigner functions. Their simple form allows one to solve the problem of calculating the matrix elements of the microscopic Hamiltonian needed for the study of three-cluster systems within the algebraic version of RGM. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530909
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Microwave radiation by a relativistic electron beam propagation through low-pressure air (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 366-371 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Intense relativistic electron beams fired into air at varying pressures display a wide range of microwave signatures. These experiments held beam current, energy, and pulse length constant while varying gas pressure. Our observing window is 10 to 40 GHz. At low pressures (〈10 mTorr) exponential spectra result, consistent with beam reflexing or virtual cathode oscillations. Above 20 mTorr the spectrum flattens and suggests collective emission at the beam-generated plasma frequencies. Power falls linearly with pressure above 20 mTorr, until electron-Neutral collisions damp the emission at a few Torr. However, weak 10 GHz emission appears at full atmospheric pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865157
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Diagnosis of mildly relativistic electron velocity distributions by electron cyclotron emission in the Alcator C tokamak (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 3809-3820 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron cyclotron emission from nonthermal electron distributions has been measured with a vertical view and control of multiple reflections. The observed intensities at the first few harmonics provide information that can be used to deduce the electron distribution function. Although harmonic overlap restricts the detail that can be obtained when the distribution is very energetic, a fitting procedure enables useful results to be obtained. The distribution functions during Ohmic runaway and lower-hybrid current drive and heating are presented. The current-drive distributions are not inconsistent with theoretical Fokker–Planck calculations, giving perpendicular and parallel "temperatures'' around 60 keV and 200 keV, respectively. The runaway cases have quite similar distributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866418
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Alcator C vertical viewing electron cyclotron emission diagnostic (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1959-1961 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Electron cyclotron emission measured vertically through the center of a tokamak plasma yields detailed information about the electron velocity distribution. A diagnostic developed for this purpose on Alcator C tokamak uses specialized focusing optics to obtain a well-collimated viewing chord, a compact viewing dump made of Pyrex or Macor to reduce the effects of wall reflection and depolarization, and a rapid-scan polarizing Michelson interferometer InSb detector system for the spectrum measurement; all constrained by the limited access and the compact size of Alcator C. Results of diffraction analysis are used to evaluate the theoretical performance of the optical system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138806
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Design and performance of compact vacuum-compatible submillimeter viewing dumps (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1242-1247 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Compact, vacuum-compatible submillimeter viewing dumps, whose design parameters were based on the results of simple ray calculations, have been fabricated from Pyrex, Macor, and alumina. The measured performance of the dumps agrees qualitatively with calculated results. The absorption is somewhat lower than expected, but still acceptable (≥99% absorption for Pyrex and Macor). In an electron cyclotron plasma emission experiment on Alcator C tokamak, comparison of the emission spectra with and without the dump shows that the dump in this configuration is effective in suppressing the unwanted radiation by approximately 90%. The additional reflection is believed to be due to a portion of the antenna pattern missing the dump.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138635
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Measurements of mildly relativistic electron distribution functions during lower hybrid heating and current drive (invited) (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1951-1955 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Nonthermal electron distribution functions, arising during lower hybrid heating and current drive, have been measured on Alcator C tokamak using vertical electron cyclotron emission and also bremsstrahlung x-ray emission. The methods used for deconvolving the distribution from the radiation measurements are summarized and examples are given of results from different types of plasma, illustrating the present capabilities of the techniques. The cyclotron emission results are consistent with the x-ray analysis but provide additional information, particularly at lower energies (30–100 keV). The x rays are less ambiguous at high energy and give good forward/backward asymmetry diagnosis. The quality of information appears to be already adequate for a quantitative comparison with theory, but further experimental improvements seem possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139194
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Measurement of negative-ion density in high-density C4F8 plasma using a laser photodetachment technique combined with a millimeter-wave open resonator (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 495-497 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A technique for measuring negative-ion density in high-density plasmas used for materials processing has been developed; negative ions were detected by measuring the electron-density perturbation caused by laser photodetachment using a millimeter-wave open resonator. The measured negative-ion density for an inductively-coupled C4F8(5%–20%)/Ar plasma with electron densities around 1011 cm−3 at a pressure of 25 mTorr was comparable to the electron density. The results suggest that species produced via dissociation of C4F8 attaches electrons as effectively as C4F8. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.127022
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Evaluation of exciton absorption peak broadening factors in InGaAsP/InP multiple quantum wells (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2290-2292 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We evaluated the magnitude of broadening factors of ground-state exciton absorption peaks in In1−xGaxAsyP1−y/InP (x=0.47y) multiple quantum wells (MQW's) with about 10 nm wells. The absorption peaks broadened with a decrease of y. Analyzing the absorption peak broadening with increasing temperature, the thermal broadening factor at 300 K was found to be about 9 meV and composition independent. Analyzing the photoluminescence linewidth at 4.2 K, it was found that composition fluctuations in the well caused an inhomogeneity of the exciton energy level of 4.4 meV for the y=1.0 MQW and 7.5 meV for the y=0.6 MQW, being the greatest contributors to inhomogeneous broadening. We conclude that the exciton absorption peak broadening with a decrease of y is primarily due to the increase of composition fluctuations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100256
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    90° phase-matched ultraviolet generation at 0.2660 μm in LiClO4⋅3H2O (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6097-6098 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: LiClO4⋅3H2O has been found to be 90° phase-matchable for ultraviolet generation at 0.2660 μm at a crystal temperature of 30.6 °C. A peak power as high as 28 MW with an average power of 2.2 W was obtained in a 1.5-cm-long crystal. Sellmeier's equations and nonlinear constant of this crystal are reported. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363683
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Room-temperature violet stimulated emission from optically pumped AlGaN/GaInN double heterostructure (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 1377-1379 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An AlGaN/GaInN heterostructure has been fabricated by metalorganic vapor phase epitaxy. We observed room-temperature (RT) violet stimulated emission from an optically pumped double heterostructure (DH) using GaInN as an active layer. The peak wavelength of the stimulated emission at RT from Al0.17Ga0.83N/Ga0.91In0.09N DH is 402.5 nm, and the threshold of excitation power density is about 0.13 MW/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111942
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...