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10
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84931497188
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note that later careful calibration of the magnetic field resulted in the significantly larger magnetic moment values cited in the present work.
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13
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84931497189
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D. R. Miller, in Atomic and Molecular Beam Methods, edited by G. Scoles (Oxford Univ. Press, New York, 1988), p. 14; see also J. B. Anderson, in Molecular Beams and Low Intensity Gas Dynamics (Marcel-Dekker, New York, 1974).
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14
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84931497190
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From molecular dynamics calculations, P. Ballone and M. Mareschal (to be published), find that Fe40 thermally relaxes in about 0.5 mus when PHe= 200 Torr and THe= 300 K. From their data (appropriately scaled, Ref. [9]), we find for PHe< 2 Torr (i.e., t > 1000 mus), that Tvib= Tnoz within 1 K, while Trot is about 20 K lower than Tnoz, corresponding to quasieffusive conditions. For PHe= 60 Torr, Tvib is 25 K below and Trot is 150 K below Tnoz= 300 K corresponding to supersonic conditions.
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17
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84931497191
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J. L. Persson, Ph.D. thesis, U.C.L.A. 1991, confirmed the anomalies for cobalt and iron clusters.
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20
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0002326328
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In Ref. [13] Bucher and co-workers performed experiments on cobalt clusters similar to ours in Ref. [1] giving closely related results: Supersonically cooled clusters have reduced M (and their experimental data also appear to be nonlinear with B). However, they refuted our claimed dependence of M on Trot. Instead from M they calculated vibrational temperatures using the superparamagnetic model. Hence they find for short dwell times that Tvib >> Tnoz. However, for supersonically cooled clusters this procedure always yields too large cluster temperatures, sometimes even by several orders of magnitude as we demonstrate here. Furthermore, their temperatures conflict with independent temperature measurements (Ref. [11]), with Persson's findings (Ref. [12]), and with generally accepted molecular beam properties (Ref. [9]). The long (τ > 1000 mus) thermalization times they claimed (Ref. [13]) to justify the temperatures are orders of magnitude greater than found by, [Truncated]
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(1990)
J. Chem. Phys.
, vol.93
, pp. 94
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Knickelbein, M.B.1
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22
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84931497172
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D. C. Mattis, The Theory of Magnetism (Springer Verlag, Berlin, 1988), 2nd ed.;
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