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  • Digitale Medien  (7)
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  • Digitale Medien  (7)
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  • 1
    Digitale Medien
    Digitale Medien
    Chemical-beam-epitaxy growth of indium-containing III–V compounds using triisopropylindium (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 917-922 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Triisopropyl indium (TIPIn) has been investigated as an alternative to trimethyl indium for use in chemical-beam epitaxy (CBE). In previous CBE studies of GaAs/AlGaAs growth, the replacement of methyl-containing precursors with ethyl- and isopropyl-containing precursors has been shown both to widen the substrate temperature window available for growth, and also to reduce unintentional carbon incorporation in the grown layers. In the present study of (100)InxGa1−xAs (0≤x≤0.1) growth using the new TIPIn source, in situ modulated-beam mass spectrometry studies have demonstrated a similar, and technologically very important, widening of the substrate temperature window. Furthermore, use of the new precursor combination, TIPIn and triisopropyl gallium, is also shown to generate state-of-the-art InGaAs material with electrical and optical properties directly comparable to corresponding material grown using molecular-beam epitaxy. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.360872
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  • 2
    Digitale Medien
    Digitale Medien
    An instrument for measuring angular distribution of sputtered neutral atoms (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 452-459 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: An apparatus utilizing laser-induced fluorescence (LIF) has been developed to measure high-resolution angular distributions of sputtered neutral atoms. LIF provides sensitive detection, a feature necessary to monitor the low atomic fluxes inherent to angularly resolved sputtering measurements in the static sputtering regime. The apparatus incorporates a detector assembly which rotates about the sample in an ultrahigh vacuum (UHV) chamber, allowing a large range of angular measurements at different ion beam incidence angles. Laser light is brought to the detector in the UHV chamber via a single optical fiber and fluorescence photons exit the chamber via a fiber bundle. The optical fiber and fiber bundle are mounted in a fixed orientation on the detector, maintaining constant alignment as the assembly rotates. Angular resolution in the polar plane containing the incident ion beam and the surface normal is better than 3°. Angular resolution in the direction perpendicular to the polar plane is governed by the Doppler shift and is 0.028° for 3.2 eV atoms. Overall detection efficiency is estimated to be 5×10−9 counts per sputtered atom and 2×10−3 counts per atom entering the detection volume. Initial experiments using polycrystalline Zr to characterize the device are described.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1144215
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  • 3
    Digitale Medien
    Digitale Medien
    Angular distributions of sputtered zirconium atoms (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 5887-5898 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Ion beams with energies in the range 1–2 keV are used to sputter neutral Zr atoms from a polycrystalline surface. Laser induced fluorescence detection is used to obtain angular distributions of sputtered neutrals as a function of ion impact direction, ion mass, ion energy, and spin–orbit state of the exiting atoms. About 40% of the sputtered atoms are excited. Angular distributions depend weakly on ion mass and energy. The angular distributions are fitted well by a modified form of the Roosendaal and Saunders model of sputtering.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.464880
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  • 4
    Digitale Medien
    Digitale Medien
    Investigation of the growth of gallium arsenide thin films by metalorganic molecular beam epitaxy using gallane-quinuclidine adduct (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 1270-1272 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The use of gallane-quinuclidine adduct (GaH3[N(CH2CH2)3CH] ) as a chemical precursor in metal organic molecular beam epitaxy (MOMBE) and chemical beam epitaxy (CBE) has been investigated. The compound displays a long-term stability and can be readily admitted as a molecular beam into the growth chamber without significant decomposition. The surface decomposition pathway of the precursor on the growth surface is similar to that of the highly successful alane adduct precursors already in widespread use. Efficient MOMBE growth of GaAs is observed at much lower temperatures than is the case when conventional Ga alkyl precursors are employed. These results show that gallane adducts may have the potential to act as practical low carbon precursors in CBE and MOMBE.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.109754
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  • 5
    Digitale Medien
    Digitale Medien
    Laser-induced fluorescence analysis of vapor-phase pyrene (1981)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 85 (1981), S. 2180-2182 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j150615a008
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  • 6
    Digitale Medien
    Digitale Medien
    A new laser concept for isotopically selective analysis of noble gases (1985)
    Springer
    Applied physics 38 (1985), S. 57-64 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 06 ; 32
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A new laser approach for the isotopically selective analysis of noble gases is presented. This approach uses noble gas atoms prepared in the 1s 5 metastable state. Hyperfine levels in the 1s 5 and 2p 9 states form two-level systems in Ne, Ar, Kr, and Xe which can be excited by a commercially available single-frequency laser system. Absorption of photons from such a laser, and the resulting momentum transfer, can be used to selectively deflect the desired isotope from a supersonic atomic beam into a detection area. Light from the same laser can then be used to selectively count atoms of the desired isotope using the photon-burst technique. Thus, enrichment and selective detection are accomplished with a single laser in a single pass through the apparatus. The problem of analyzing for85Kr in a sample of noble gases extracted from the air is examined in detail. This is a stringent test of the selectivity of this approach because85Kr has the same nuclear spin, and thus similar hyperfine splittings, as naturally occurring83Kr. Calculations indicate that isotopic selectivity of the new approach is easily adequate to resolve85Kr in a 1010 excess of83Kr.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00691771
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  • 7
    Digitale Medien
    Digitale Medien
    Anomalous linewidths and peak-height ratios in137Ba hyperfine lines (1988)
    Springer
    Applied physics 47 (1988), S. 201-206 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32.70.Jz ; 35.10.Fk
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have investigated several effects of optical pumping in the hyperfine spectrum of the6s6p 1 P 1⇔6s 2 1 S 0 transition in137Ba. Most of these effects are explained by absorption strength changes which occur because of redistribution of population among magnetic substates. At very low laser intensities, no redistribution effects are observed. At higher intensities, it is possible to either empty the magnetic substates that are accessible to optical excitation, or to redistribute the population among these states until a steady-state condition is achieved. The first case results in the familiar disappearance of a hyperfine line. The less familiar second case can result in peak-height ratios in the Ba1 P 1⇔1 S 0 hyperfine spectrum that differ by almost a factor of three from the low-intensity case. In this second case, the observed linewidth can either broaden or narrow, depending on whether redistribution decreases or increases absorption strength. At high intensities, saturation effects dominate and branching to intermediateD states becomes apparent. We report here the result of a numerically integrated rate equation model which shows good agreement with our experiments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00684089
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