2015
DOI: 10.1063/1.4921778
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Copper dimer interactions on a thermomechanical superfluid 4He fountain

Abstract: Laser induced fluorescence imaging and frequency domain excitation spectroscopy of the copper dimer (B(1)Σg (+) ←X(1)Σu (+)) in thermomechanical helium fountain at 1.7 K are demonstrated. The dimers penetrate into the fountain provided that their average propagation velocity is ca. 15 m/s. This energy threshold is interpreted in terms of an imperfect fountain liquid-gas interface, which acts as a trap for low velocity dimers. Orsay-Trento density functional theory calculations for superfluid (4)He are used to … Show more

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Cited by 9 publications
(12 citation statements)
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“…Note that the Landau critical velocity predicted by the functional, which determines the onset of bulk dissipative behavior in time-dependent applications, is the slope of a straight line passing through the origin and tangent to the dispersion curve near the roton minimum. 27,42 The influence of these terms to the description of a vortex line structure is discussed in Ref. 43, see also Sec.…”
Section: B the Orsay-trento Density Functionalmentioning
confidence: 99%
“…Note that the Landau critical velocity predicted by the functional, which determines the onset of bulk dissipative behavior in time-dependent applications, is the slope of a straight line passing through the origin and tangent to the dispersion curve near the roton minimum. 27,42 The influence of these terms to the description of a vortex line structure is discussed in Ref. 43, see also Sec.…”
Section: B the Orsay-trento Density Functionalmentioning
confidence: 99%
“…39 Unfortunately, this function depends on the true many-body wave function of the helium bath and therefore it cannot be directly obtained from OT-DFT. In this work, we have employed the approach developed in our earlier work, 18,40,41 which allows approximate evaluation of first order polarization at excitation angular frequency ω:…”
Section: ■ Theorymentioning
confidence: 99%
“…In several studies [18][19][20] electric motors were used stepper to rotate the sample at a predetermined angle. In a recent paper [21] on the study of laser ablation in superfluid helium electric motor were used to rotate the target. The motor was mounted outside the liquid in the helium vapor, at the top part of cryostat, and the connection to the target was carried out by a shaft.…”
Section: Introductionmentioning
confidence: 99%