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  • 33.20.Kf  (2)
  • heavy metals  (2)
  • 3320K  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Accurate determination of wavenumbers for iodine molecular lines in the red spectral region (1989)
    Springer
    Applied physics 48 (1989), S. 463-466 
    Details
    ISSN: 1432-0649
    Keywords: 3320K ; 4272
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine structure of various absorption lines of molecular iodine with wavenumbers between 12980 and 13890 cm−1 has been resolved using Doppler-free polarization spectroscopy. The wavenumbers of theo-component of 17 rovibrational lines of I2 due to the transitionB 3Π ou + −X1∑ g + with even rotational quantum numbers have been determined with an accuracy of 0.001 cm−1. A comparison of the centers of gravity of these 17 lines with the values of the iodine atlas of Gerstenkorn et al. yields a difference of $$\delta \tilde v = \tilde v_{c.g} - \tilde v_{atl} = - (1.8 \pm 1.2)x 10 - 3 cm^{ - 3}$$ thus corroborating the data of the iodine atlas in the red region within limits of error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694680
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spectroscopy of alkali atoms and molecules attached to liquid He clusters (1995)
    Springer
    The European physical journal 98 (1995), S. 413-416 
    Details
    ISSN: 1434-6036
    Keywords: 36.40.td ; 33.20.Kf ; 67.90.tZ
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Large helium clusters, ranging in size from a few hundred to several thousand atoms, are produced in a nozzle expansion. Combining this source with a pick-up scattering cell in which the clusters can be seeded with chromophores allows us to probe the influence of the helium environment on the atoms and molecules attached to the clusters. Using an alkali as chromophore we recorded laser induced fluorescence spectra of Na atoms and molecules attached to helium clusters. Apart from the spectrum of the Na monomer, we have found spectroscopic bands which can unambiguous be assigned to two bound Na atoms. The first of this bands is due to 11 ∑ μ + (A) ← 11 ∑ g + (X) excitations of the covalently bound singlet Na2 molecule while the second is due to 13 ∑ g + ← 13 ∑ μ + excitations for the van der Waals bound triplet Na2 dimer. Both bands have been vibrationally resolved. Furthermore we found very large fluorescence intensities in the region 605–635 nm which are likely due to the excitation of a species containing three Na atoms attached to a helium cluster.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01338416
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Seasonality of VAM infection in three populations of Agrostis capillaris (Gramineae) on soil with or without heavy metal enrichment (1992)
    Springer
    Plant and soil 139 (1992), S. 67-73 
    Details
    ISSN: 1573-5036
    Keywords: Agrostis capillaris ; heavy metals ; macro- and micro-nutrients ; natural populations ; seasonality ; VAM-infection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Three populations of the perennial grass Agrostis capillaris, growing on limestone derived clay with and without natural enrichment of the heavy metals cadmium, lead, and zinc, and on a sandy soil polluted by a metal smelter have been investigated with regard to the percentage and seasonality of infection with vesicular-arbuscular mycorrhizal (VAM) fungi and its impact on mineral nutrition. In all populations VAM infection was lowest during winter, and highest during late summer and autumn. The population at the metal smelter site was less infected by VAM fungi than both other populations. The concentration of mineral nutrients for the three populations was clearly related to the soil concentration, but hardly modified by the degree of VAM infection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012843
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The role of biomarkers in environmental assessment (4). Terrestrial plants (1994)
    Springer
    Ecotoxicology 3 (1994), S. 180-192 
    Details
    ISSN: 1573-3017
    Keywords: adaptation ; damage ; drought ; fluorinated compounds ; heavy metals ; phytochelatins ; proline ; putrescine ; seleno amino acids ; stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The potential of metabolites, enzymatic processes and changes in plant performance as biomarkers in environmental assessment is reviewed. Biomarkers may be used as an early warning system of specific or general stress at each biological level, from molecules to ecosystems. The sensitivity of a species and, thus, the efficiency of a biomarker will depend on the degree of already present adaptation to environmental stress and on the homogeneity of the investigated population. Biomarkers for specific environmental stresses are scarce; better known are biomarkers for environmental stress complexes such as heavy metals, physiological drought and extreme temperature or biomarkers as a reaction on a full scale of environmental stresses. It is argued that a battery of biomarkers is necessary to evaluate chemical hazards to species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00117083
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Polarization spectroscopy of Sr79Br and Sr81Br: Analysis of theX 2 Σ + andB 2 Σ + hyperfine structure (1986)
    Springer
    The European physical journal 1 (1986), S. 103-112 
    Details
    ISSN: 1434-6079
    Keywords: 33.40.Hp ; 33.20.Kf ; 35.20.Sd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Microwave optical polarization spectroscopy has been used to measure the hyperfine structure in theX 2 Σ + (v=0) electronic ground state of Sr79Br and Sr81Br. Optical hyperfine structure in theB 2 Σ +−X 2 Σ + (0,0) system was resolved by Doppler-free laser polarization spectroscopy. The magnetic hyperfine parametersb andc and the electricquadrupole hfs parametereqQ were determined for theX 2 Σ + andB 2 Σ + states of both molecules. The magnetic hfs has been interpreted as an effect of halide electron spin polarization. The electric quadrupole coupling constants are compared with the alkali halides and discussed in terms of Sternheimer antishielding in polar molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384664
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    Paper (German National Licenses)
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