Magnetic Levitation and Noncoalescence of Liquid Helium

Weilert, M.; Whitaker, Dwight; Maris, Humphrey J.; Seidel, G. M.

doi:10.1103/physrevlett.77.4840

Cited by 100 publications

(68 citation statements)

References 6 publications

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“…These drops were levitated in magnetic [15] or laser dipolar [16] traps. Because of the much smaller surface to volume ratio compared to nanodroplets and thus limited rate of evaporative cooling, these large drops have temperatures in the Kelvin range.…”

Section: Production Of Helium Nanodroplets and Source Designmentioning

confidence: 99%

Spectroscopy and dynamics in helium nanodroplets

Stienkemeier

Lehmann

2006

J. Phys. B: At. Mol. Opt. Phys.

396

555

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Abstract. This article provides a review of recent work in the field of helium nanodroplet spectroscopy with emphasis on the dynamical aspects of the interactions between molecules in helium as well as their interaction with this unique quantum solvent. Emphasis is placed on experimental methods and studies introducing recent new approaches, in particular including time-resolved techniques. Corresponding theoretical results on the energetics and dynamics of helium droplets are also discussed.

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Section: Production Of Helium Nanodroplets and Source Designmentioning

confidence: 99%

Spectroscopy and dynamics in helium nanodroplets

Stienkemeier

Lehmann

2006

J. Phys. B: At. Mol. Opt. Phys.

396

555

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“…At high magnetic field intensities, even nonmagnetic materials, such as para-or diamagnetic materials, have shown obvious responses to the field. For example, utilizing magnetic force, a great number of nonmagnetic materials with a wide range of dimensions, such as water, glass, organic materials and even alloy melts, have been successfully levitated [2][3][4][5]. This provides the possibility of controlling the solidified structures of the materials using high magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Effects of high magnetic fields on solidified structures of Mn-90.4 wt% Sb hypoeutectic alloy

Wang

Liu

Zhang

et al. 2009

Science and Technology of Advanced Materials

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Mn-90.4 wt% Sb alloy specimens were solidified under both uniform magnetic field and magnetic field gradient conditions. The solidification behavior was examined to elucidate the effects of high magnetic fields on the solidified structure evolution of this hypoeutectic alloy. The macrostructures on the longitudinal section of the alloys were investigated by optical microscopy and x-ray diffraction (XRD). The volume fraction of primary MnSb phases and the interrod spacing of the eutectic were measured by metallographic analysis. It was found that the segregation of the primary MnSb particles at the certain regions of the specimens occurred under the influence of high magnetic field gradients. The MnSb phases obtained under magnetic fields were oriented with their (h0 l) planes along the direction of the magnetic field. Both the volume fraction of primary MnSb phases and the interrod spacing of the eutectic were decreased upon the application of the high magnetic fields.

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“…Negligible viscosity, therefore, may cause some unique shapes of superfluid droplets, which are of particular interest. Vortices in helium droplets have been considered theoretically [13][14][15] and were searched for experimentally by levitating superfluid 4 He droplets in inhomogeneous magnetic fields [16]. It was also observed that charged droplets in a rotating electric field develop pronounced deformations that were ascribed to the excitation of capillary waves travelling along the droplet's equator [17].…”

Section: Introductionmentioning

confidence: 99%

Shapes of rotating superfluid helium nanodroplets

et al. 2017

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Rotating superfluid He droplets of approximately 1 μm in diameter were obtained in a free nozzle beam expansion of liquid He in vacuum and were studied by single-shot coherent diffractive imaging using an x-ray free electron laser. The formation of strongly deformed droplets is evidenced by large anisotropies and intensity anomalies (streaks) in the obtained diffraction images. The analysis of the images shows that, in addition to previously described axially symmetric oblate shapes, some droplets exhibit prolate shapes. Forward modeling of the diffraction images indicates that the shapes of rotating superfluid droplets are very similar to their classical counterparts, giving direct access to the droplet angular momenta and angular velocities. The analyses of the radial intensity distribution and appearance statistics of the anisotropic images confirm the existence of oblate metastable superfluid droplets with large angular momenta beyond the classical bifurcation threshold.3

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Magnetic Levitation and Noncoalescence of Liquid Helium

Cited by 100 publications

References 6 publications

Spectroscopy and dynamics in helium nanodroplets

Spectroscopy and dynamics in helium nanodroplets

Effects of high magnetic fields on solidified structures of Mn-90.4 wt% Sb hypoeutectic alloy

Shapes of rotating superfluid helium nanodroplets

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