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  • 1
    Book
    Book
    ¬The¬ social life of information (2000)
    Boston, MA :Harvard Business School Press,
    Details
    Title: ¬The¬ social life of information
    Author: Brown, John S.
    Contributer: Duguid, Paul
    Publisher: Boston, MA :Harvard Business School Press,
    Year of publication: 2000
    Pages: 320 S.
    Type of Medium: Book
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    Zuse Institute Berlin get availability status
  • 2
    Electronic Resource
    Electronic Resource
    The detection of the free radical FO (X 2Π3/2) by submillimeter-wave spectroscopy (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 5523-5526 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Pure rotational transitions of the free radical FO in its X 2Π3/2 ground electronic state have been detected by millimeter-wave spectroscopy. Four transitions, which are all magnetic dipole in character, were measured in the frequency region from 219 to 408 GHz. The radical was produced by a well-known efficient reaction between ozone and fluorine atoms. The high sensitivity available in the submillimeter-wave region and a very efficient production method were essential for the detection of rotational transitions in this radical, which many other people have attempted in the past. No electric dipole transitions have been detected in this experiment. The precision of parameters associated with the rotational motion of FO has been improved considerably by fitting these lines together with previous data. Moreover, the parity-dependent nuclear spin rotation term CI′ has been determined for the first time. The r0 and re structures of FO have been revised accordingly. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481184
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  • 3
    Electronic Resource
    Electronic Resource
    Fine-structure spectrum of the FO radical, observed by far-infrared laser magnetic resonance (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 7273-7286 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The fine-structure transition 2Π1/2←2Π3/2 of the free radical FO has been detected by far-infrared laser magnetic resonance. All the observed transitions are magnetic dipole in character. The spin–orbit constant A0 has been determined experimentally; its value of −196.108 686(50) cm−1 is consistent with previous estimates. The analysis of a set of 290 transitions leads to the determination of a number of molecular parameters including rotational, centrifugal distortion, spin–orbit, lambda-doubling, magnetic hyperfine, and Zeeman terms. All four magnetic hyperfine structure constants a, bF, c, d for the 19F nucleus have been determined and are discussed in terms of the expectation values of the appropriate operators over the electronic wave function. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478630
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  • 4
    Electronic Resource
    Electronic Resource
    The identification of In2O in the gas phase by high resolution electronic spectroscopy (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 4439-4442 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The molecular species In2O has been identified in the gas phase as a product of the high temperature reaction between water and indium (850 °C) or between indium trioxide (In2O3) and indium (950 °C) by the observation of an electronic transition in the near-ultraviolet. The spectra are simplified by supersonic cooling of the sample in a free jet expansion after it is formed. The vibrational structure shows that the molecule has a very similar geometry in the two states involved while the 18O/16O isotope shift suggests that the molecule is only slightly nonlinear in the excited electronic state. Rotational structure can be resolved at high resolution and shows an intensity alternation; the molecule thus has a symmetric In–O–In arrangement. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474786
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and biological activity of substance P C-terminal hexapeptide analogues: structure-activity studies (1986)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 29 (1986), S. 1281-1284 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00157a028
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  • 6
    Electronic Resource
    Electronic Resource
    Structure activity studies on the C-terminal hexapeptide of substance P with modifications at the glutaminyl and methioninyl residues (1987)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 30 (1987), S. 1512-1515 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00391a041
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  • 7
    Electronic Resource
    Electronic Resource
    Rotational analysis and assignment of the 630 nm band system of FeH to the e 6Π–c 6Σ+ transition (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 428-435 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An investigation of the electronic spectrum of FeH at ∼630 nm using dispersed and undispersed laser induced fluorescence techniques is reported. Eighty lines have been assigned to the (0,0) vibrational band of the e 6Π–c 6Σ+ transition. The transitions can be arranged in three subbands with all six spin components of the c 6Σ+ state accessed. This has allowed the c 6Σ+ state to be fully characterized and provides parity assignments of individual rotational levels for the first time. The energy levels of the c 6Σ+ state conform approximately to a Hund's case (a′) coupling scheme with significant Ω-type doubling (1–10 cm−1). An attempt has been made to simulate the levels using an effective Hamiltonian. Although the simulation failed to reproduce the results to within experimental uncertainty (∼0.007 cm−1), the residuals are sufficiently small to confirm the correctness of the assignments. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475404
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  • 8
    Electronic Resource
    Electronic Resource
    Rotational analysis and assignment of the green band system of FeH to the e 6Π–a 6Δ transition (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 4823-4831 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The technique of laser excitation spectroscopy at Doppler resolution has been used to record bands in the electronic spectrum of FeH around 532 nm. A number of lines were also recorded at sub-Doppler resolution using intermodulated fluorescence spectroscopy. Dispersed fluorescence studies were used extensively to aid the assignment of a total of 153 lines in this region of the spectrum to either the (0,0) or the (0,1) band of the e 6Π–a 6Δ transition. All the assignments from the excitation spectrum obey the selection rule ΔΩ=−1, giving subbands which involve the lowest three spin components in each state; transitions with ΔΩ=0 were seen only in dispersed fluorescence. Term values have been determined for the three components in both the ground vibrational level of the e 6Π electronic state and the first excited vibrational level of the a 6Δ electronic state (those for the v=0 level of the a 6Δ state have been determined previously). This study provides the first characterization of the spin components and the rotational levels of the e 6Π state of FeH. This state is heavily perturbed and exhibits pronounced lambda-type doubling, making it very difficult to model the energy levels using an effective Hamiltonian approach. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473531
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  • 9
    Electronic Resource
    Electronic Resource
    The identification of the FeH2 radical in the gas phase by infrared spectroscopy (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 4859-4861 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The FeH2 radical has been detected in the gas phase through the observation of transitions in the fundamental band of the antisymmetric stretching vibration ν3. The molecule was generated in an electrical discharge through a mixture of hydrogen and iron pentacarbonyl in helium and the signals were recorded by the technique of laser magnetic resonance. It is established that the molecule is linear in its ground state and that this state is 5Δ in character; theoretical calculations suggest that it has gerade symmetry. The vibrational band origin is determined to be 1674.7196(4) cm−1 and the rotational constant for the (0,0,0) level is 3.01328(3) cm−1. This latter value corresponds to an r0 Fe–H bond length of 0.1665 nm. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471180
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  • 10
    Electronic Resource
    Electronic Resource
    Rotational analysis of bands in the 460 nm system of nickel dichloride produced in a free-jet expansion: Determination of the structure and electronic ground state of nickel dichloride (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 48-63 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: By use of a free-jet expansion which incorporates a heated nozzle, we have recorded the laser excitation spectrum of the 460 nm band system of NiCl2 at rotational resolution. The rotational temperature in these recordings was about 12 K. Several bands have been recorded and analyzed for three isotopomers, 58Ni35Cl2, 60Ni35Cl2, and 58Ni35Cl37Cl in natural abundance. Spin components with Ω values of 0 and 1 have been identified in both the upper and lower states of the transition. Accurate values for all three vibrational intervals ν1, ν2, and ν3 have been determined for nickel dichloride in the upper state and for the bending wave number ν2 in the lower state. The results show that the molecule is linear in both states involved in the transition and that the lower (ground) state is 3Σ−g in character. Evidence is presented from the nickel isotope shifts to show that the transition is vibronically induced through the bending vibration and that the upper state is vibronically 3Πu in character; it probably derives from an electronic 3Δg state. The zero-point averaged bond lengths are determined for both states as r0′=0.209 435(13) nm and r0″=0.205 317(14) nm. The fine structure parameters for the X˜ 3Σ−g state are interpreted in terms of low lying 1Σ+g and 3Πg states, which are shown to lie a few thousand reciprocal centimeters above the ground state. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470875
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