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Volumn 123, Issue 6, 2005, Pages

NMR measurements of hyperpolarized 3He gas diffusion in high porosity silica aerogels

Author keywords

[No Author keywords available]

Indexed keywords

ATOMIC MOTION; GAS DIFFUSION; MEAN FREE PATHS; SPIN-ECHO SIGNALS;

EID: 24144470776     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.1997130     Document Type: Article
Times cited : (18)

References (103)
  • 36
    • 0043211082 scopus 로고    scopus 로고
    • C. P. Bidinosti, J. Choukeife, P.-J. Nacher, and G. Tastevin, J. Magn. Reson. 1090-7807 10.1016/S1090-7807(02)00198-2 162, 122 (2003). A slightly inaccurate numerical prefactor has been given for He2 in Table B.1. The temperature fit in the 200-400 K range actually gives D3 =1.967× (T300)1.71 atm× cm2 s. The diffusion coefficient for isotopic mixtures must be accordingly modified: D3-4 =1.840× (T300)1.71 atm× cm2 s; Also, consequently, in G. Tastevin, Physica B 329-333, 303 (2003), the correct values of the diffusion coefficients at 1 mbar and 293 K are D31 =1914 cm2 s for He3, and D N2 1 =790 cm2 s for He3 in N2 (a 1% and 1.4% change, respectively, due to the combined former errors in D3 and pressure units).
    • (2003) J. Magn. Reson. , vol.162 , pp. 122
    • Bidinosti, C.P.1    Choukeife, J.2    Nacher, P.-J.3    Tastevin, G.4
  • 37
    • 0043211082 scopus 로고    scopus 로고
    • A slightly inaccurate numerical prefactor has been given for He2 in Table B.1. The temperature fit in the 200-400 K range actually gives D3 =1.967× (T300)1.71 atm× cm2 s. The diffusion coefficient for isotopic mixtures must be accordingly modified: D3-4 =1.840× (T300)1.71 atm× cm2 s;
    • C. P. Bidinosti, J. Choukeife, P.-J. Nacher, and G. Tastevin, J. Magn. Reson. 1090-7807 10.1016/S1090-7807(02)00198-2 162, 122 (2003). A slightly inaccurate numerical prefactor has been given for He2 in Table B.1. The temperature fit in the 200-400 K range actually gives D3 =1.967× (T300)1.71 atm× cm2 s. The diffusion coefficient for isotopic mixtures must be accordingly modified: D3-4 =1.840× (T300)1.71 atm× cm2 s; Also, consequently, in G. Tastevin, Physica B 329-333, 303 (2003), the correct values of the diffusion coefficients at 1 mbar and 293 K are D31 =1914 cm2 s for He3, and D N2 1 =790 cm2 s for He3 in N2 (a 1% and 1.4% change, respectively, due to the combined former errors in D3 and pressure units).
  • 38
    • 0037568198 scopus 로고    scopus 로고
    • C. P. Bidinosti, J. Choukeife, P.-J. Nacher, and G. Tastevin, J. Magn. Reson. 1090-7807 10.1016/S1090-7807(02)00198-2 162, 122 (2003). A slightly inaccurate numerical prefactor has been given for He2 in Table B.1. The temperature fit in the 200-400 K range actually gives D3 =1.967× (T300)1.71 atm× cm2 s. The diffusion coefficient for isotopic mixtures must be accordingly modified: D3-4 =1.840× (T300)1.71 atm× cm2 s; Also, consequently, in G. Tastevin, Physica B 329-333, 303 (2003), the correct values of the diffusion coefficients at 1 mbar and 293 K are D31 =1914 cm2 s for He3, and D N2 1 =790 cm2 s for He3 in N2 (a 1% and 1.4% change, respectively, due to the combined former errors in D3 and pressure units).
    • (2003) Physica B , vol.329-333 , pp. 303
    • Tastevin, G.1
  • 39
    • 0043211082 scopus 로고    scopus 로고
    • the correct values of the diffusion coefficients at 1 mbar and 293 K are D31 =1914 cm2 s for He3, and D N2 1 =790 cm2 s for He3 in N2 (a 1% and 1.4% change, respectively, due to the combined former errors in D3 and pressure units).
    • C. P. Bidinosti, J. Choukeife, P.-J. Nacher, and G. Tastevin, J. Magn. Reson. 1090-7807 10.1016/S1090-7807(02)00198-2 162, 122 (2003). A slightly inaccurate numerical prefactor has been given for He2 in Table B.1. The temperature fit in the 200-400 K range actually gives D3 =1.967× (T300)1.71 atm× cm2 s. The diffusion coefficient for isotopic mixtures must be accordingly modified: D3-4 =1.840× (T300)1.71 atm× cm2 s; Also, consequently, in G. Tastevin, Physica B 329-333, 303 (2003), the correct values of the diffusion coefficients at 1 mbar and 293 K are D31 =1914 cm2 s for He3, and D N2 1 =790 cm2 s for He3 in N2 (a 1% and 1.4% change, respectively, due to the combined former errors in D3 and pressure units).
  • 45
    • 84856123205 scopus 로고    scopus 로고
    • Ph.D. thesis: " Cornell University
    • J. V. Porto, Ph.D. thesis: " Superfluid He3 in aerogel., " Cornell University, 1997 (unpublished).
    • (1997) Superfluid He3 in Aerogel
    • Porto, J.V.1
  • 66
    • 33645585752 scopus 로고    scopus 로고
    • W. Heil (private communication); J. Schmiedeskamp, A. Deninger, H.-J. Elmers, (unpublished).
    • Heil, W.1
  • 73
    • 0003913838 scopus 로고
    • Cambridge University Press, Cambridge
    • The relevant mfp λ is computed from the diffusion coefficient: D=vλ3. In the particular case of self-diffusion in a single gas, λ is twice the usual collisional mfp, as defined from molecular diameter or obtained from other transport coefficients such as viscosity or heat conduction [see, e.g., J. Jeans, An Introduction to the Kinetic Theory of Gases, (Cambridge University Press, Cambridge 1948), pp. 207-210]. In pure He3, λ is thus equal to 400 μm at 1 mbar for free gas diffusion at 293 K.
    • (1948) An Introduction to the Kinetic Theory of Gases , pp. 207-210
    • Jeans, J.1
  • 74
    • 84856128135 scopus 로고    scopus 로고
    • See EPAPS Document No. E-JCPSA6-123-034528 for plots and discussion of the pressure dependence obtained for Deff when aerogel-free spaces are taken into account, or when other types of mfp distributions in aerogel are used. This document can be reached via a link in the online article's HTML reference section or via the EPAPS homepage (http://www.aip.org/pubservs/epaps.html).
    • EPAPS Document No. E-JCPSA6-123-034528 , vol.E-JCPSA6-123-034528


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.