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  • Springer Nature  (8)
  • American Institute of Physics (AIP)  (6)
  • Nature Publishing Group  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Energy dissipation in matrix-isolated silver atoms: A time-resolved fluorescence study (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3434-3440 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The fluorescence from optically excited Ag atoms in Ar, Kr, and Xe matrices has been investigated in a time-resolved synchrotron-radiation study. A detailed energy dissipation model could be established from a systematic analysis of rise and decay times of all the observed fluorescence bands after pulsed excitation into the Ag (4d105p)2P1/2,3/2 levels, and by setting time windows between the excitation pulses in emission and emission-yield spectroscopy. Although the overall wavelength dependence of the decay time follows the λ3 law, the decay time is independent of λ within a given emission band. Finally, the role of energy transfer between Ag atoms and dimers for the evaluation of decay times is briefly addressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453892
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  • 2
    Electronic Resource
    Electronic Resource
    The optical spectra of matrix-isolated Znn (n≤6) (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1147-1151 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The optical properties of small Zn clusters, especially of Zn2 and Zn3, isolated in neon have been studied over a wide photon energy range by absorption, emission, and photoelectron spectroscopy. By employing emission yield spectroscopy the optical transitions of the dimer and the trimer could be unequivocally distinguished from those of higher clusters in the matrix. For Zn2, the experimental data compare reasonably well with calculations found in the literature. However, the ground state, which is usually calculated to be nonbinding, is found to be bound. The main absorption bands of at least three more Zn clusters, tentatively assigned to Zn4–Zn6, have been derived from the concomitant growth of bands in a systematic concentration study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452258
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  • 3
    Electronic Resource
    Electronic Resource
    The electronic spectra of matrix-isolated nickel atoms: The coexistence of the 3D3 and 3F4 ground states in Ar, Kr, and Xe (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 1623-1630 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electronic spectra of nickel atoms isolated in matrices of the four noble gases have been assigned in considerable detail. The associated experimental and theoretical study has unequivocally revealed that nickel atoms can simultaneously exist in two electronic ground states, 3d94s1:3D3 and 3d84s2:3F4, in argon, krypton, and xenon matrices where they also occupy at least three different trapping sites. In neon they appear to exist in one site and one state, 3d84s2:3F4, only. In argon, krypton, and xenon matrices the 3D3 is the dominant ground state. Some sites occupied by atoms in the 3F4 ground state can be annealed away, but others are found to be stable to this procedure. The effects of the matrix upon the guest atoms are briefly discussed. It is interesting that only one possible case of band splitting can be identified in the spectra though the observed blue shifts are of the usual magnitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448394
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  • 4
    Electronic Resource
    Electronic Resource
    Chemical Investigation of Hæmoglobin F from an Individual with Persistent Fœtal Hæmoglobin (1962)
    [s.l.] : Nature Publishing Group
    Nature 193 (1962), S. 1161-1162 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE pertinent literature on the condition that results in the persistence of foetal haemoglobin in adult life has been discussed in detail by Maclver, Went and Irvine1 in connexion with their work on a large family in which the condition was prevalent. In reported instances of persistent foetal ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1931161a0
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  • 5
    Electronic Resource
    Electronic Resource
    Amino-Acid Composition of the Polypeptide Chains of Gorilla Hæmoglobin (1961)
    [s.l.] : Nature Publishing Group
    Nature 192 (1961), S. 984-985 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Recent investigation in these laboratories has shown that gorilla haemoglobin contains two pairs of polypeptide chains. These have the same Af-terminal sequence by the dinitrophenyl method as the polypeptide chains of human haemoglobin2'3. We designate them, therefore, the a- and p-chains. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/192984a0
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  • 6
    Electronic Resource
    Electronic Resource
    The optical spectra of matrix-isolated palladium–nitrogen complexes: An investigation by absorption, emission, and photoelectron spectroscopy (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 1348-1354 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The optical spectra of palladium in neon and argon matrices containing up to 100% dinitrogen have been studied. Beside the known bands of isolated Pd atoms new strong bands assigned to weakly bonded Pd(N2)m (m=1, 2) complexes appear. The bands are attributed to three different types of transition. The dominant lines are essentially due to transitions localized at the Pd atom but strongly perturbed by a "crystal field'' due to the weakly bonded N2 molecules. Secondly, a vibrational progression at lower energies is assigned to a Pd to N2 charge transfer transition and thirdly, at high energies, a vibrational progression assigned to a locally excited state of an N2 molecule perturbed by weak bonding to Pd is observed. No evidence has been found for the presence of Pd(N2)3. Photoelectron spectra of the Pd(N2)m complexes in neon have been observed. The Pd 4d photoemission peak is shifted with respect to the Pd atom in Ne by ∼1.1 eV to higher binding energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451222
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  • 7
    Electronic Resource
    Electronic Resource
    Hereditary persistence of foetal haemoglobin (1975)
    [s.l.] : Nature Publishing Group
    Nature 257 (1975), S. 70-71 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ALTHOUGH the interpretation of Martinez and Colombo1 may be correct, their conclusions are based on uncertain evidence and an alternative explanation that fits within the classical scheme is equally plausible. Their argument rests entirely on the statement that "foetal haemoglobin (HbF) levels show ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/257070c0
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  • 8
    Electronic Resource
    Electronic Resource
    Anomaly in the γ chain heterogeneity of the newborn (1977)
    [s.l.] : Nature Publishing Group
    Nature 265 (1977), S. 63-65 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Distribution of glycine residues of gCB-3 from the cord bloods of black and Caucasian newborns from different areas. Open columns denote data from newborns without haemoglobinopathy, and black columns denote data from HbS- and/or HbC-containing samples, a, Burke County blacks; b, Caucasians; ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/265063a0
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  • 9
    Electronic Resource
    Electronic Resource
    Hot electron relaxation dynamics in ZnSe (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 1089-1091 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ultrafast relaxation dynamics of hot electrons, initially photoexcited with an excess energy of 300 meV, are monitored in a high-quality ZnSe epilayer grown on a GaAs substrate by exploiting the intrinsic interferrometric asymmetric Fabry–Perot sample structure. The results are consistent with the expected characteristic electronic LO-phonon emission time of 40–50 fs and provide evidence for the influence of the "hot phonon effect"(or "LO-phonon bottleneck") on the electron cooling dynamics at carrier densities above ∼3×1017 cm−3. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119736
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  • 10
    Electronic Resource
    Electronic Resource
    Estimating the Maunder minimum from auroral data (1988)
    [s.l.] : Nature Publishing Group
    Nature 335 (1988), S. 676-676 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Some of the recent papers concerning the solar activity in the seventeenth and eighteenth centuries infer that auroral observations can be used to provide new evidence for the solar minimum described by Maunder1. For example, Eddy23 has suggested that auroral data may be used to provide a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/335676b0
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