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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 59 (1994), S. 433-436 
    ISSN: 1432-0649
    Keywords: 42.62.Fi ; 35.10.Fk ; 32.70.Fw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The resonance spectroscopic techniques - level-crossing, optical double resonance and quantum-beat spectroscopy - have been employed following pulsed laser excitation. The use of pulsed lasers has enabled spectroscopic studies of atomic structures and radiative lifetimes in the UV/VUV spectral region.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-6079
    Keywords: 32.70.Fw ; 42.62.Fi ; 42.65.Ky
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Time resolved laser spectroscopy in the VUV spectral region is applied to investigate the (n=5−8) 3d 10 4snp 1 P 1 series of neutral zinc. The natural lifetimes of this series were measured by time-resolved laser-induced fluorescence. We find τ(n=5)=11.7(9) ns, τ(n=6)=80(8) ns, τ(n=7)=179(20) ns and τ(n=8)=356(35) ns. These results are compared with a theoretical calculation.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2016-02-04
    Description: We show that entrepreneurs are co-located within cities. One plausible source of such spatial clustering is local social interactions, where individuals’ decisions to become entrepreneurs are influenced by entrepreneurial neighbors. Using geo-coded matched employer–employee data for Sweden, we find that sharing residential neighborhood with established entrepreneurs has a statistically significant and robust influence on the probability that an individual leaves employment for entrepreneurship. An otherwise average neighborhood with a 5% point higher entrepreneurial intensity, all else equal, produces between six and seven additional entrepreneurs per square kilometer, each year. Our estimates suggest a local feedback-effect in which the presence of established entrepreneurs in a neighborhood influences the emergence of new local entrepreneurs. Our analysis supports the conjecture that social interaction effects constitute a mechanism by which local entrepreneurship clusters in cities develop and persist over time.
    Keywords: J24 - Human Capital ; Skills ; Occupational Choice ; Labor Productivity, L26 - Entrepreneurship, R12 - Size and Spatial Distributions of Regional Economic Activity, R23 - Regional Migration ; Regional Labor Markets ; Population
    Print ISSN: 1468-2702
    Electronic ISSN: 1468-2710
    Topics: Geography , Economics
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