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  • 1
    Electronic Resource
    Electronic Resource
    The hyperfine interactions in CsF (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 8396-8399 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The molecular beam electric resonance technique has been used to examine the hyperfine spectrum of CsF to determine the nuclear quadrupole interaction of the cesium nucleus. A total of 95 transitions in vibrational states v=0−5 and rotational states J=1−8 have been included in a fit to determine the cesium nuclear quadrupole and spin–rotation interactions, the fluorine spin–rotation interaction, and the tensor and scalar parts of the spin–spin interaction. Vibration and rotation dependencies of these constants have been determined, allowing correction for zero point vibration effects. This experimental Cs nuclear quadrupole coupling constant when combined with the electric field gradient calculated using a relativistic coupled cluster method yields a nuclear quadrupole moment of the Cs nucleus equal to eQ=−3.43098 mbarn. The vibrational dependence of the coupling constant is smaller than the theoretical estimate. The coupling constants we have determined are the following: eQCsqCs=1245.598(10)−14.322(25)(v+1/2)+0.080(14)(v+1/2)2+0.0040(22)(v+1/2)3−0.00209(59)J(J+1)+0.00048(40)(v+1/2)J(J+1), cCs=0.66177(14)−0.01509(28)(v+1/2)+0.000550(94)(v+1/2)2, cF=15.08163(84)−0.1744(14)(v+1/2)+0.00234(41)(v+1/2)2−0.000093(13)J(J+1), c3=0.92713(53)−0.00917(93)(v+1/2)+0.00097(29)(v+1/2)2, c4=0.62745(30)−0.00903(22)(v+1/2). All values are in kHz units, with one standard deviation uncertainty estimates in the last two digits shown in ( ). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480213
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence for a nuclear hexadecapole interaction in the hyperfine spectrum of LiI (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 2431-2436 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The molecular beam electric resonance technique has been used to examine the hyperfine spectrum of 7LiI to determine the nuclear hexadecapole interaction of the iodine nucleus. The nuclear magnetic octupole interaction was also considered but found to be marginally significant. A total of 172 transitions in vibrational states 0-3 and rotational states 1-6 have been included in a fit to determine the iodine nuclear quadrupole, spin-rotation, and hexadecapole interactions, the lithium quadrupole and spin-rotation interactions, and the tensor and scalar parts of the spin-spin interaction. Vibration and rotation dependencies of these constants have been determined. The results include: eHh=−0.0151(30), eQIqI=−194351.212(17)−8279.521(46)(v+1/2)+100.616(34)(v+1/2)2−0.3949(73)(v+1/2)3−6.41977(50)J(J+1)+0.10593(33)(v+1/2)J(J+1),eQLiqLi=172.613(52)−3.26(14)(v+1/2)+0.00145(87)J(J+1),cI=6.80260(32)+0.00303(49)(v+1/2)−0.000118(13)J(J+1), cLi=0.75872(72)−0.0088(11)(v+1/2), c3=0.62834(68)−0.0050(11)(v+1/2), c4=0.06223(36)+0.00041(26)(v+1/2), and eΩIωI′=0.000112(73), all in kHz with one standard deviation uncertainties for the last 2 digits in ( ). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477972
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  • 3
    Electronic Resource
    Electronic Resource
    Incorporation of optically active erbium into GaAs using the novel precursor tris(3,5-di-tert-butylpyrazolato)bis(4-tert-butylpyridine)erbium (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 1825-1831 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the use of an alternative erbium precursor, tris(3,5-di-tert-butyl- pyrazolato)bis(4-tert-butylpyridine)erbium, to dope erbium into GaAs. The incorporated erbium forms an optically active center identified as Er–2O. The GaAs:Er formed using this precursor exhibits sharper and more intense optical emission, attributed to the Er–2O center, than that previously found with cylcopentadienyl-based erbium sources. Codoping GaAs:Er with shallow donors results in a quenching of the erbium-related luminescence, while codoping with shallow acceptors results in no significant change in the spectrum. Mechanisms for the observed luminescence-quenching behavior are discussed. Deep level transient spectroscopy performed on silicon or selenium codoped GaAs:Er showed the presence of several electron traps in the upper half of the band gap. The origins of these electron traps are considered. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369179
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  • 4
    Electronic Resource
    Electronic Resource
    Photoluminescence and free carrier interactions in erbium-doped GaAs (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 4918-4927 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The photoluminescence properties of GaAs:Er doped with a new pyrazole and pyridine-based Er source, tris(3,5-di-tert-butylpyrazolato)bis(4-tert-butylpyridine)erbium(III), were investigated. These samples showed significantly stronger and sharper 1.54 μm Er3+ luminescence than in GaAs:Er samples doped with cyclopentadienyl-based Er sources. The efficient luminescence was associated with the Er–2O center, formed with unintentional oxygen impurities. The Er3+ emission was greatly reduced in n-type samples, whereas the emission remained strong in p-type samples. This trend suggests that either the free hole concentration is very important to the Er3+ excitation efficiency, and/or there is a strong Auger quenching mechanism which involves free electrons. A model based on the results of a two-beam experiment indicates the presence of strong Auger energy transfer from the Er-bound exciton to a free electron. Auger energy transfer from the excited Er3+ ion to a free electron was found to be much less important. The temperature dependence of the Er3+ emission was also examined. A decrease in intensity was observed at the lowest temperatures. This effect was attributed to the freeze-out of carriers onto a relatively shallow trap which could be related to either Er or shallow acceptors. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367293
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  • 5
    Electronic Resource
    Electronic Resource
    Oxygen-related defects in low phosphorous content GaAs1−yPy grown by metal organic vapor phase epitaxy (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 2263-2269 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The mixed Group V ternary alloy GaAs1−yPy (y〈0.17) has been grown by metal organic vapor phase epitaxy and doped with oxygen using the oxygen precursor, diethylaluminum ethoxide [C2H5OAl(C2H5)2]. Controlled oxygen doping was accomplished over the range of 0〈y〈0.17. Deep level transient spectroscopy measurements reveal the presence of several oxygen-related deep levels. These levels, previously found in GaAs:O, vary with alloy composition over the investigated range. An additional deep level, most probably associated with the presence of misfit-related defects, has been identified. Photoluminescence performed on the oxygen-doped samples indicates that band edge emission is reduced and lower energy emission features are introduced over the wavelength range of 1000–1200 nm as a result of oxygen incorporation. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366032
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  • 6
    Electronic Resource
    Electronic Resource
    The electric dipole moment and hyperfine interactions of KOH (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 3361-3365 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A molecular beam spectrometer has been used to observe the hyperfine spectrum and determine the electric dipole moment of the KOH molecule. This EDM had never been measured previously, although theoretical calculations had been made. A refined line shape fitting procedure has helped make possible this determination from the molecular beam hyperfine spectrum. The value of the EDM, which we found for the ground vibrational state, is 7.415±0.002 debye. The hyperfine constants, including the potassium nuclear quadrupole, both spin–rotation interactions, and the tensor and scalar spin–spin interactions have been determined for several vibrational states. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472221
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  • 7
    Electronic Resource
    Electronic Resource
    The hyperfine spectrum of sodium bromide
    Amsterdam : Elsevier
    Journal of Molecular Spectroscopy 122 (1987), S. 171-181 
    Details
    ISSN: 0022-2852
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-2852(87)90227-X
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  • 8
    Electronic Resource
    Electronic Resource
    Lineshape Analysis of Second-Order Molecular Beam Transitions
    Amsterdam : Elsevier
    Journal of Molecular Spectroscopy 166 (1994), S. 158-168 
    Details
    ISSN: 0022-2852
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/jmsp.1994.1181
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  • 9
    Electronic Resource
    Electronic Resource
    Centrifugal distortion effects in the hyperfine spectrum of KCl
    Amsterdam : Elsevier
    Journal of Molecular Spectroscopy 108 (1984), S. 6-16 
    Details
    ISSN: 0022-2852
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-2852(84)90282-0
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  • 10
    Electronic Resource
    Electronic Resource
    The deuterium quadrupole interaction in ND"3
    Amsterdam : Elsevier
    Journal of Molecular Spectroscopy 77 (1979), S. 102-108 
    Details
    ISSN: 0022-2852
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-2852(79)90201-7
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