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  • 1970-1974  (7)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    A new method for the production of atomic beams of highly refractory elements and first atomic beam magnetic resonances in Ta181 (1970)
    Springer
    The European physical journal 230 (1970), S. 329-336 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new universal method for the production of atomic beams of highly refractory elements has been developed. The beams of free atoms are produced by locally heating a small area on a target consisting of the material to be evaporated. The local heating is achieved via the focussed electron beam of a commercial electron gun. The atomic beams so obtained are suitable for studying hyperfine structures by the atomic beam magnetic resonance method. The first observedrf resonances in the ground state4 F 3/2 and the first excited state4 F 5/2 of Ta181 are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01403122
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Hyperfine structure investigations in the4F9/2 atomic ground state of191Ir and193Ir (1973)
    Springer
    The European physical journal 263 (1973), S. 341-346 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The5d 76s2 4F9/2 atomic ground state of191Ir and193Ir has been studied using the atomic-beam magnetic-resonance method. The results are:193Ir:g J(4F9/2)=1.29694 (3)191Ir:Δv(4F9/2; F=6↔F=5)=659.26496 (12) MHzΔv( 4F9/2; F=5↔F=4)=189.44002 (09) MHzΔv( 4F9/2; F=3↔F=4)=84.05040 (80) MHzA=57.52148 (04) MHzB=471.20425 (57) MHzC=−0.020 (30) kHz193Ir:Δv( 4F9/2; F=6↔F=5)=660.09043 (12) MHzΔv( 4F9/2; F=5↔F=4)=224.47848 (13) MHzΔv( 4F9/2; F=↔F=4)=33.53453 (89) MHzA=62.65556 (05) MHzB=426.23546 (64) MHzC=0.020 (30) kHz Using the magnetic dipole moments known by NMR-technique [1] we obtained for the electric quadrupole moments as calculated from the hyperfine interaction constantsA andB:Q(191Ir)=0.78 (20) barns,Q(193Ir)=0.70 (18) barns (uncorrected for core polarization effects). A calculation of the hyperfine anomaly yields:191 Δ 193=−0.00023 (10). The ratio of theB factors which should be the same as for the quadrupole moments turned out to be:B(191Ir)/B(193Ir)=Q(191Ir)/Q(193Ir)=1.105502(3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01391592
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Hyperfine structure measurements in the ground states5 F 5,5 F 4,5 F 3 and5F2 of99Ru and101Ru with the atomic beam magnetic resonance method (1974)
    Springer
    The European physical journal 269 (1974), S. 189-193 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine structure of the four lowest levels5 F 5, 4, 3, 2 of the5 F ground state multiplet arising from the configuration 4d 7 5s in99Ru and101Ru has been studied by the atomic — beam magnetic — resonance technique. After applying corrections due to the effects of off-diagonal hyperfine mixing we obtain the following multipole interaction constants:99Ru:A(5 F 5)=−204.5514(33) MHzB(5 F 5)=27.281 (62) MHzA 5 F 4=−163.6845(36) MHzB(5 F 4)=17.455(52) MHzA 5 F 3=−135.0294(37) MHzB(5 F 3)=10.164(50) MHzA(5 F 2)=− 82.5325(27) MHzB(5 F 2)=5.457(22) MHz101Ru:A(5 F 5)=−229.2881(33) MHzB(5 F 5)=158.934(62) MHzA(5 F 4)=−183.4744(36) MHzB(5 F 4)=101.799(52) MHzA(5 F 3)=−151.3502(38) MHzB(5 F 3)=59.323(50) MHzA(5 F 2)=−92.4974(27) MHzB(5 F 2)=31.869(23) MHz. The magnetic dipole and the electric quadrupole moments of the99Ru and101Ru nuclear ground states as calculated from these constants are the following:μ I (99Ru)=−0.594(119) nmQ(99Ru)=0.077 (15) barnsμ I (101Ru)=−0.666(133)nmQ(101Ru)=0.45 (9) barns. From measurements of the Zeeman effect in the even isotope102Ru we find the followingg J -factors for the5 F ground multiplet:g J (5 F 5)=1.397741(20)g J (5 F 4)=1.347604(20)g J (5 F 3)=1.248988(20)g J (5 F 2)=1.001120(3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01668681
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  • 4
    Electronic Resource
    Electronic Resource
    Atomic beam magnetic resonance investigations in the3 F 2 Ground State of177Hf,179Hf and180Hf (1972)
    Springer
    The European physical journal 250 (1972), S. 57-67 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The 5d 26s 2 3 F 2 ground state of177Hf,179Hf and180Hf has been studied using the atomic beam magnetic resonance method. The atomic beam was produced by an universal evaporation technique described in a previous paper. The results are180Hfg j (3 F 2)=0.695812 (10)177Hf Δv(3 F 2;F=11/2↔F=9/2)=991.7917 (10) MHz Δv(3 F 2;F=9/2↔F=7/2)=477.0081 (10) MHz Δv(3 F 2;F=7/2↔F=5/2)=162.8890 (10) MHz179HfΔv(3 F 2;F=13/2↔F=11/2)=82.1320 (10) MHz Δv(3 F 2;F=11/2↔F=9/2)=392.8498 (10) MHz. The magnetic dipole and electric quadrupole moments of the177Hf and179Hf nuclear ground states as calculated from these hyperfine structure measurements are the following: μ(177)=0.75(8)μ k , Q(177)=4.34 (65) barns μ(179)=−0.61 (6)μ k , Q(179)=4.90 (75) barns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01386892
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  • 5
    Electronic Resource
    Electronic Resource
    Ground state hyperfine structure and nuclear magnetic dipole moments of177Hf and179Hf (1973)
    Springer
    The European physical journal 260 (1973), S. 157-164 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the atomic beam magnetic resonance method the experimental hyperfine structure data of the 5d 26s 2 3 F 2 ground state of177Hf and179Hf described in a previous paper [1] have been completed. After applying corrections due to perturbations by other fine structure levels of the configuration 5d 26s 2 we got the following multipole interaction constants: $$\begin{gathered} ^{177} Hf:A = 113.43314 (7) MHz B = 624.3293 (13) MHz \hfill \\ C = 0.27 (18) KHz D = 0.045 (40) KHz \hfill \\ ^{179} Hf: A = - 71.42891 (9) MHz B = 705.5181 (24) MHz \hfill \\ C = - 0.43 (20) MHz D = 0.07 (6) KHz. \hfill \\ \end{gathered} $$ By measuring rf transitions at magnetic fields between 1100 and 1550 Gauss the nuclear ground state magnetic dipole moments were determined. The results are: $$\mu _I (^{177} Hf) = 0.7836 (6) \mu _N , \mu _I (^{179} Hf) = - 0.6329 (13) \mu _N $$ (uncorrected for diamagnetic shielding).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01448975
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  • 6
    Electronic Resource
    Electronic Resource
    Hyperfine structure measurements in the ground states4 F 3/2,4 F 5/2 and4 F 7/2 of Ta181 with the atomic beam magnetic resonance method (1971)
    Springer
    The European physical journal 244 (1971), S. 149-162 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Applying a recently developed evaporation technique for refractory elements the following results have been obtained for Ta181 in an atomic beam magnetic resonance experiment studying the hyperfine structure of 3 levels of the ground state multiplet4 F: $$\begin{gathered} g_J (^4 F_{3/2} ) = 0.45024 (4) \hfill \\ \Delta v (^4 F_{3/2} ;F = 5 \leftrightarrow F = 4) = 1822.389 (6) MHz \hfill \\ \Delta v (^4 F_{3/2} ;F = 4 \leftrightarrow F = 3) = 2325.537 (2) MHz \hfill \\ \Delta v (^4 F_{5/2} ;F = 6 \leftrightarrow F = 5) = 1451.476 (7) MHz \hfill \\ \Delta v (^4 F_{5/2} ;F = 5 \leftrightarrow F = 4) = 1537.530 (8) MHz \hfill \\ \Delta v (^4 F_{5/2} ;F = 4 \leftrightarrow F = 3) = 1444.685 (2) MHz \hfill \\ \Delta v (^4 F_{7/2} ;F = 4 \leftrightarrow F = 3) = 1218.372 (2) MHz. \hfill \\ \end{gathered}$$ From these measurements the following constants of the magnetic dipole interaction (A) and the electric quadrupole interaction (B) have been derived: $$\begin{gathered} A (^4 F_{3/2} ) = 509.0801 (8) MHz \hfill \\ B (^4 F_{3/2} ) = - 1012.251 (8) MHz \hfill \\ A (^4 F_{5/2} ) = 313.4681 (8) MHz \hfill \\ B (^4 F_{5/2} ) = - 834.820 (12) MHz. \hfill \\ \end{gathered}$$
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01407256
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  • 7
    Electronic Resource
    Electronic Resource
    Ground state hyperfine structure of95Mo and97Mo (1974)
    Springer
    The European physical journal 266 (1974), S. 271-274 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The hyperfine structure of the ground state 4d 5 5s 7 S 3 of95Mo and97Mo has been measured by the atomic beam magnetic resonance technique with the following results:95Mo:A=−208.582060(10)MHz,B=37.050 (100) kHzC=−30 (10) Hz,D=−3 (3) Hz97Mo:A=− 212.980930 (10) MHz,B−69.990(140)kHzC=−5 (10) Hz,D=0 (3) Hz. After application of corrections calculated according to second order perturbation theory, the hyperfine structure constants became:95Mo: Ac=−208.582560(290)MHz,B c =16.920(4300)kHzC c=−30(270) Hz,D c =− 3 (50) Hz97Mo: Ac=212.981450(300) MHz,B c =−90.780(4400)kHzC c=−6(270) Hz,D c =0 (50) Hz. With the known ratio ofg I(95Mo)/g I(97Mo) [1] a calculation of the hyperfine anomaly yields:95 Δ 97=−0.01009(17)%. The ratio of the uncorrectedB factors isB(97Mo)/B(95Mo)=−1.8890(47). Because of the relatively large effects of second order hyperfine structure, the ratio of the correctedBfactors differs considerably from the ratio of the uncorrectedB factors. From the correctedB factors the electric quadrupole moments may be evaluated by means of calculated radial integrals [2]. The results are:Q (95Mo)=−0.019(12)barns,Q(97Mo)=0.102(39)barns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01668819
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