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  • 1985-1989  (6)
  • 1970-1974  (6)
  • 1960-1964  (2)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    High orbital angular momentum states in H2 and D2. II. The 6h–5g and 6g–5f transitions (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3926-3933 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A group of lines accompanying the first line of the Pfund series of the H atom has been observed by Fourier transform infrared spectrometry. The lines are due to transitions in molecular hydrogen of a nonpenetrating Rydberg electron possessing a high-orbital angular momentum, which is coupled only loosely to the vibrations and rotations of the H+2 core. Lines belonging to the 6h–5g and 6g–5f (v=0–3) transitions of H2 have been identified. The identifications are based on a calculation of the spectrum from first principles by multichannel quantum defect theory. The interaction between the nonpenetrating electron and the core was evaluated in terms of the permanent and induced molecular moments of H+2 as calculated by Bishop and collaborators. The analogous transitions in D2 have also been observed and assigned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456824
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular Spectroscopy: A Personal History (1985)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 36 (1985), S. 1-31 
    Details
    ISSN: 0066-426X
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pc.36.100185.000245
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  • 3
    Electronic Resource
    Electronic Resource
    Rydberg Molecules (1987)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 38 (1987), S. 27-56 
    Details
    ISSN: 0066-426X
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pc.38.100187.000331
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  • 4
    Electronic Resource
    Electronic Resource
    Spectroscopic identification of the lowest rotation–vibration levels of the (2pσ)2 F 1Σ+g state of the D2 molecule (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 2384-2391 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The previously unobserved lowest vibrational levels of the F state of D2 are detected by the identification of F 1Σ+g–B 1Σ+u bands in infrared emission spectra of electric discharges recorded with a Fourier–transform spectrometer. The rotation–vibration structure of the F state, v=0–5, J=0–5, is in good agreement with accurate ab initio calculations which include the effects of tunneling in the double-minimum potential of the EF 1Σ+g state. For the v=J=0 levels of H2 and D2 the absolute energy error of the ab initio calculation extrapolates, for infinite nuclear mass, to an error of the electronic F state energy of +0.7±0.1 cm−1. This is consistent with Jungen's recent accurate spectroscopic determination of the ionization potentials of the excited states of H2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451093
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  • 5
    Electronic Resource
    Electronic Resource
    Spectroscopic identification of the lowest rotation-vibration levels of the (2pσ)2 F 1Σ+g state of the H2 molecule (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 962-968 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Many lines in the infrared emission spectrum of the hydrogen molecule are still unidentified. We report here the identification of a number of such lines corresponding to transitions from the lowest two vibrational levels, v=0 and v=1, of the (2pσ)2 F 1∑+g state of H2. Intensity distributions observed in the bands of the F 1∑+g−B 1∑+u system are consistent with theory. New or more accurate rotational term values are also found for the v=2–4 levels of the F state, and molecular constants are reported. The rotation-vibration structure of the F state (v=0–4; J=0–5) is in good agreement with accurate ab initio calculations which include the effects of tunneling in the double-minimum potential function of the EF state as well as nonadiabatic effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449423
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  • 6
    Electronic Resource
    Electronic Resource
    The 4f states of He2: A new spectrum of He2 in the near infrared (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 1181-1192 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new spectrum of the He2 molecule has been discovered in the region 5100–5900 cm−1. It is identified as the 4f–3d Rydberg transition of He2 with a weak contribution of 4d–3p in the same region. The uncoupling of l from the internuclear axis in both the triplet and the singlet system is almost complete in the 4f complex; the appropriate quantum number is N+ corresponding to the rotational angular momentum of the He+2 core. The electronic fine structure in each N+ level depends on the dipole polarizability α of the core and its anisotropy as well as on the quadrupole moment Q2 and higher moments Q4,... of the core. Conversely, from the observed structure some of the quantities characterizing the core have been determined, e.g., α=1/3(2α⊥+α(parallel)) =2.82 ±0.02, Q2=1.39±0.13, Q4=0.99±0.14, all in atomic units. The detailed rotational analysis of the spectrum shows that widespread perturbations occur in the triplet 4f levels, the largest affecting the N=6,N+=3 and N=9,N+=7 levels which are shifted towards higher energies by 1 and 2 cm−1, respectively. The perturbations are clearly caused by Δl=2 interaction with corresponding levels of 4pπ for which Orth and Ginter have found the opposite perturbations. There are no similar perturbations in the corresponding singlet levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450509
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  • 7
    Electronic Resource
    Electronic Resource
    Identification of Free Radicals in Flash Photolysis (1964)
    [s.l.] : Nature Publishing Group
    Nature 204 (1964), S. 988-988 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The occurrence of the spectrum of NCN in the flash photolysis of fulminic acid is an example of the need for caution in the assignment of observed spectra on the basis of excitation conditions or chemical considerations only. The history of spectroscopy abounds in such examples. We only need to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/204988a0
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  • 8
    Electronic Resource
    Electronic Resource
    Twenty-parameter eigenfunctions and energy values of the 23 S States of He and He-like Ions (1963)
    Springer
    The European physical journal 171 (1963), S. 83-89 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Twenty-parameter calculations of the energies and wave functions of the first excited states 23 S of He, Li+, Be++, B+++, O6+, Ne8+, Mg10+, have been carried out using Hylleraas' method. The energy values have been corrected for mass polarization. The coefficients of the best wave functions are listed. Similar calculations for the 23 S state of the H− ion yield an energy value which cannot be distinguished from the energy of a free H atom. For He and Li+, in addition, forty-parameter calculations have been carried out. The results compare well with the recent calculations of Pekeris using a somewhat different method. Even after the inclusion of the relativistic correction, the theoretical energy values deviate slightly from the observed. The differences, −0·10±0·05 cm−1 for He and −1·07±0·10 cm−1 for Li+, represent observed values of the Lamb shifts in the 23 S states. These values agree within their uncertainties with the values predicted from quantum electrodynamics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01379339
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  • 9
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    Unknown
    Wilhelm Dilthey in der heutigen westdeutschen Philosophie (1970)
    Berlin : Periodicals Archive Online (PAO)
    Deutsche Zeitschrift für Philosophie. 18:1 (1970) 87 
    Details
    ISSN: 0012-1045
    Topics: Philosophy
    Notes: BEMERKUNGEN UND BERICHTE
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4085-1970-018-01-000006
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  • 10
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    Anna Simonovits: Dialektisches Denken in der Philosophie von Gottfried Wilhelm Leibniz (Book Review) (1970)
    Berlin : Periodicals Archive Online (PAO)
    Deutsche Zeitschrift für Philosophie. 18:3 (1970) 375 
    Details
    ISSN: 0012-1045
    Topics: Philosophy
    Notes: REZENSIONEN
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4085-1970-018-03-000010
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