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  • American Institute of Physics (AIP)  (127)
  • 1990-1994  (127)
  • 1980-1984
  • 11
    Electronic Resource
    Electronic Resource
    Electron paramagnetic resonance study of thermal donors in Fe-doped InP (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 7392-7396 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of thermal annealing of semi-insulating InP wafers in the 660–820 °C temperature range under SiNx capping condition is studied by electron paramagnetic resonance (EPR) spectroscopy. The annealing leads to the formation of electrically active, deep thermal donors with total defect concentrations up to 1016 cm−3. The thermal donors are of intrinsic origin. By transient EPR spectroscopy the activation energies for electron emission of the dominant thermal donors were determined to be 0.40 and 0.14 eV, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349735
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  • 12
    Electronic Resource
    Electronic Resource
    New III-V diluted magnetic semiconductors (invited) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6103-6108 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new class of diluted magnetic semiconductor (DMS) based on a III-V semiconductor is reviewed. The new DMS, (In,Mn)As, was made possible by low temperature molecular beam epitaxial growth. Magnetic measurements and x-ray diffraction showed homogeneous incorporation of Mn in the films under certain growth conditions, and inclusion of a MnAs-like phase if the conditions are not optimized. The films can be made either p- or n-type by choosing the growth conditions and/or doping. Homogeneous n-type (In,Mn)As layers were paramagnetic and showed negative magnetoresistance. On the other hand, remanent magnetization was observed in p-type samples at low temperature and an anomalous Hall effect associated with it. The presence of such effects was most readily explained in terms of formation of bound magnetic polarons. A first result of anomalous Hall effect in a heterojunction is also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347780
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  • 13
    Electronic Resource
    Electronic Resource
    Green's function calculation of the valence photoemission spectra of PF3 and NiPF3 (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 6953-6957 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have performed ab initio algebraic diagrammatic construction [ADC(3)] Green's function calculations of the valence photoemission spectra of PF3 and NiPF3. We obtained overall good agreement with experiment for both the free PF3 molecule and the PF3 molecule chemisorbed on a Ni(111) metal surface. A comparison to NiCO shows that there are certain similarities between NiPF3 and NiCO, not only in the σ donor–π acceptor bonding mechanism in the ground state, but also in the metal–ligand CT excitations associated with the creation of a valence hole in the ligand. However, it appears that the many-body effect, such as the configuration interactions in the final ionized state, seems to be weaker for NiPF3 than for NiCO, judging from the main line spectral intensity. The quasiparticle picture of the 4e level breaks down completely as in the case of the 1π level of NiCO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463649
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  • 14
    Electronic Resource
    Electronic Resource
    Determination of potential energy curves for ground and metastable excited state transition metal ions interacting with helium and neon using electronic state chromatography (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 6591-6605 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Reduced zero field mobilities of Cr+, Co+, and Ni+ in their ground state configuration (3dn) and their metastable excited state configuration (3dn−14s1) have been measured in He and Ne as a function of temperature. Parameters for a n−6−4 interaction potential are obtained by fitting the mobility vs temperature curve. Bond dissociation energies, vibrational frequencies, and equilibrium bond lengths are extracted from these curves and compared with data from traditional equilibrium measurements and ab initio theory. Dramatic changes in bonding are observed for the 3dn and 3dn−14s1 configurations; the 3dn configuration yielding very much stronger bonds and very much shorter equilibrium bond lengths than the 3dn−14s1 configuration. The presence of multiple potential curves in the interaction of Co+(3F,3d8) and Ni+(2D,3d9) with He/Ne make interpretation of the ground state mobility data ambiguous. The analysis of each system is discussed in some detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462598
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  • 15
    Electronic Resource
    Electronic Resource
    Structures of carbon cluster ions from 3 to 60 atoms: Linears to rings to fullerenes (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 3835-3837 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new method for identifying and characterizing cluster ion isomers is presented. Results indicate that most carbon clusters have more than one stable form, with 29≤n≤45 indicating three or four different structures. Fullerenes first appear at C+30 and begin to dominate above C+45. From small to large the isomeric progression is from linear to rings to fullerenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460783
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  • 16
    Electronic Resource
    Electronic Resource
    Ab initio variational calculations of the vibrational properties of Li+3, Li2Na+, LiNa+2, and KLiNa+ (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 1107-1120 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A rovibrational Hamiltonian has been derived in terms of rectilinear displacement coordinates which is based on the Watson Hamiltonian. Moreover, it is a generalization of the Carney and Porter analysis for D3h triatomic systems [J. Chem. Phys. 65, 3547 (1976)] and Carney et al. analysis for C2v triatomic systems [J. Chem. Phys. 66, 3724 (1977)]. It is therefore the most general form of the Watson Hamiltonian which is applicable to a bent triatomic system. Ab initio variational calculations using this Hamiltonian are presented for vibrational properties of Li+3, Li2Na+, LiNa+2, and KLiNa+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461140
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  • 17
    Electronic Resource
    Electronic Resource
    Electron affinities, shake-up affinities, and ionization energies of S4 isomers (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 8301-8308 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Nine isomers of S4 (D∞h,D2h,D4h,D3h,D2i,C2v, C2h,C3v,Cs) have been studied with large basis sets in Green function, CASSCF, and single and multi reference CI approaches. The C2v and D2h isomers are found to be nearly equally stable with the C2v isomer 1 kcal/mol below the D2h form and the C2h isomer about 10 kcal/mol higher in energy. All isomers have an appreciable electron affinity and some have several bound negative ion states. Besides normal electron affinities they have shake-up affinities, which may also be strongly positive. The lowest ionization energies of the isomers range from 7.5 to 9 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461257
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  • 18
    Electronic Resource
    Electronic Resource
    Study of the valence electronic structure of ethyne by electron momentum spectroscopy and Green's function methods (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 3468-3478 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The complete valence shell electron separation energy spectra and momentum distributions are measured for ethyne by high resolution electron momentum spectroscopy at a total energy of 1500 eV. Many-body calculations of the separation energies and spectroscopic factors using Green's function methods are carried out and compared with the data. The measured momentum distributions are compared with self-consistent-field (SCF) orbital wave functions, the SCF wave functions including d functions in the basis sets. The agreement between the measured momentum distributions and the SCF orbital momentum distributions is excellent. The inner valence 2σg orbital is found to be split severely by final state correlation effects. The agreement between the measured and calculated spectroscopic factors and separation energies is in general very good, although the measured separation energy spectra contain significant strength up to 50 eV, this strength being mainly of 2σg origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459768
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  • 19
    Electronic Resource
    Electronic Resource
    Valence ionization of HCl. An investigation of many-body effects (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 4331-4341 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Many-body Green's-function calculations which employ large configurational expansions and which are accurate to third and fourth order of perturbation theory are reported for the valence ionic states of HCl. Large polarized basis sets including Rydberg functions s-, p-, and d-type symmetries have been used. Third-order calculations are sufficient in the outer valence region, but in the inner valence region where the complete breakdown of the one-particle picture of ionization is observed a fourth-order theory is necessary in conjunction with large basis sets. The synchrotron and x-ray excited spectra can be assigned nearly up to the double-ionization threshold in a very satisfactory way. No indication of strong outer valence satellite lines is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457740
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  • 20
    Electronic Resource
    Electronic Resource
    Hole burning and luminescence spectroscopy of the site distribution and photoinduced reorientation of dihydrophenazine in single crystal matrices (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1581-1587 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The nonplanar structure of the electronic ground state of 5,10 dihydrophenazine (PH2) is responsible for a distribution of sites of PH2 observed upon doping into molecular crystals. The change in molecular geometry of PH2 following optical excitation results in considerable stress at the respective crystalline site, which is compensated by guest reorientation. Photochemical hole burning experiments suggest that this reorientation involves the 118 cm−1 butterfly backbone vibration of PH2 as indicated by a hole width equivalent to a vibrational relaxation time of 600 fs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458090
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