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Social capital : theory and research (2001)

Lin, Nan ; Cook, Karen S. ; Burt, Ronald S.

New York : Aldine de Gruyter

Sociology and economics

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Keywords: Capital social (Sociologie) ; Réseaux sociaux. ; Social capital (Sociology) ; Social networks. ; Social structure. ; Structure sociale.

Pages: xii, 333 p.

ISBN: 0-585-48509-7

URL: http://www.netLibrary.com/urlapi.asp?action=summary&v=1&bookid=101506

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Social capital : a theory of social structure and action (2001)

Lin, Nan

Cambridge ; New York : Cambridge University Press

Structural analysis in the social sciences

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Keywords: Action sociale. ; Capital social (Sociologie) ; Réseaux sociaux. ; Social action. ; Social capital (Sociology) ; Social networks.

Pages: xiv, 278 p.

ISBN: 0-511-01947-5

URL: http://www.netLibrary.com/urlapi.asp?action=summary&v=1&bookid=74320

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Penning collisions of laser-cooled metastable helium atoms (2001)

Pereira Dos Santos, F. ; Perales, F. ; Léonard, J. ; [et al.]

Springer

The European physical journal 14 (2001), S. 15-22

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ISSN: 1434-6079

Keywords: PACS. 32.80.Pj Optical cooling of atoms; trapping – 34.50.Rk Laser-modified scattering and reactions

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: We present experimental results on the two-body loss rates in a magneto-optical trap of metastable helium atoms. Absolute rates are measured in a systematic way for several laser detunings ranging from -5 to -30 MHz and at different intensities, by monitoring the decay of the trap fluorescence. The dependence of the two-body loss rate coefficient β on the excited state ( 23 P 2) and metastable state ( 23 S 1) populations is also investigated. From these results we infer a rather uniform rate constant K sp = (1±0.4)×10-7 cm3/s.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100530170228

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Inversion analysis of K 2 coupled electronic states with the Fourier grid method (2001)

Lisdat, Ch. ; Dulieu, O. ; Knöckel, H. ; [et al.]

Springer

The European physical journal 17 (2001), S. 319-328

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ISSN: 1434-6079

Keywords: PACS. 32.80.Pj Optical cooling of atoms; trapping – 34.50.Rk Laser-modified scattering and reactions

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: We present a new determination of the potential curves and interactions of the coupled electronic states A 1 Σ + u and b 3 Π u of the potassium dimer, based on new laser spectroscopy measurements within a molecular beam, combined with data available in the literature. We used a new global deperturbation approach, involving the Fourier Grid Hamiltonian method for energy level calculation. A standard deviation of 1.2 is obtained corresponding to a variance of 7.5×10 -3 cm-1, representing a significant improvement compared to the standard deviation of 4 yielded by the traditional local deperturbation approach.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100530170006

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Cold rubidium molecule formation through photoassociation: A spectroscopic study of the 0 g - long-range state of 87 Rb 2 (2001)

Fioretti, A. ; Amiot, C. ; Dion, C.M. ; [et al.]

Springer

The European physical journal 15 (2001), S. 189-198

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ISSN: 1434-6079

Keywords: PACS. 32.80.Pj Optical cooling of atoms; trapping – 34.50.Rk Laser-modified scattering and reactions

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: We report the detailed analysis of translationally cold rubidium molecule formation through photoassociation. Cold molecules are formed after spontaneous decay of photoexcited molecules from a laser cooled atomic sample, and are detected by selective mass spectroscopy after two-photon ionization into Rb 2 + ions. A spectroscopic study of the 0 g - (5 S + 5 P 3/2 ) pure long-range state of 87Rb2 is performed by detecting the ion yield as a function of the photoassociation laser frequency; the spectral data are theoretically analyzed within the semiclassical RKR approach. Molecular ionization is resonantly enhanced through either the 2 3 Π g or the 2 3 Σ + g intermediate molecular states. Some vibrational levels of the latter electronic state are observed and assigned here for the first time. Finally, cold molecules formation rates are calculated and compared to the experimentally measured ones, and the vibrational distribution of the formed molecules in the a 3 Σ + u ground triplet state is discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100530170165

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