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Grace, R. S.; Pope, W. M.; Johnson, Dean; Skofronick, J. G.

doi:10.1103/physreva.14.1006

Cited by 26 publications

(5 citation statements)

References 8 publications

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“…g = 2 m/s, the TCS of 4 He is four orders of magnitude larger than that of 3 He. Such behaviours are qualitatively consistent with experimental data [41]. However, a large dispersion of these data does not allow to perform a reasonable quantitative comparison.…”

Section: Matrix Of Deflection Anglesupporting

confidence: 72%

Modeling of transport phenomena in gases based on quantum scattering

Sharipov

2018

Physica A: Statistical Mechanics and its Applications

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A quantum interatomic scattering is implemented in the direct simulation Monte Carlo (DSMC) method applied to transport phenomena in rarefied gases. In contrast to the traditional DSMC method based on the classical scattering, the proposed implementation allows us to model flows of gases over the whole temperature range beginning from 1 K up any high temperature when no ionization happens. To illustrate the new numerical approach, two helium isotopes 3 He and 4 He were considered in two canonical problems, namely, heat transfer between two planar surfaces and planar Couette flow. To solve these problems, the ab initio potential for helium is used, but the proposed technique can be used with any intermolecular potential. The problems were solved over the temperature range from 1 K to 3000 K and for two values of the rarefaction parameter δ = 1 and 10. The former corresponds to the transitional regime and the last describes the temperature jump and velocity slip regime. No influence of the quantum effects was detected within the numerical error of 0.1 % for the temperature 300 K and higher. However, the quantum approach requires less computational effort than the classical one in this temperature range. For temperatures lower than 300 K, the influence of the quantum effects exceed the numerical error and reaches 67% at the temperature of 1 K.

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Section: Matrix Of Deflection Anglesupporting

confidence: 72%

Modeling of transport phenomena in gases based on quantum scattering

Sharipov

2018

Physica A: Statistical Mechanics and its Applications

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“…Further, at equilibrium density, r T has a singularity (virtual state). Judging from previous experience [13], this singularity may be interpreted as an indicator of superfluidity or a quasi-bound state [6,18,19]. It is noted that there is no singularity in the free-scattering limit, i.e., this singularity is a result of many-body effects.…”

mentioning

confidence: 96%

“…The interatomic helium potential used in both works was the Lennard-Jones potential. Also, the total scattering cross section for 3 He-3 He has been measured for projectile velocities between 105 and 1000 m/s [6] and compared to the cross sections obtained from the modified Lennard-Jones (mLJ-D) potential. There were significant deviations between measurements and the calculated results at very low velocity.…”

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confidence: 99%

A Ramsauer–Townsend effect in liquid 3He

Sandouqa

Ghassib

Joudeh

2010

Chemical Physics Letters

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“…The Ramsauer effect was certainly the first phenomenon showing the wave properties of matter. This framework has since then been used to describe very different types of collisions such as atom-atom [8] or even neutron-nucleus [9][10][11][12][13]. Our idea is that since light behaves like a wave, it should be also possible to apply Bohr/Ramsauer's ideas to light scattering by spherical particles.…”

mentioning

confidence: 99%

Ramsauer approach for light scattering on nonabsorbing spherical particles and application to the Henyey–Greenstein phase function

Louedec¹,

Urban²

2012

Appl. Opt.

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We present a new method to study light scattering on nonabsorbing spherical particles. This method is based on the Ramsauer approach, a model known in atomic and nuclear physics. Its main advantage is its intuitive understanding of the underlying physics phenomena. We show that although the approximations are numerous, the Ramsauer analytical solutions describe fairly well the scattering phase function and the total cross section. Then this model is applied to the Henyey-Greenstein parameterization of the scattering phase function to give a relation between its asymmetry parameter and the mean particle size.

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Ramsauer-Townsend effect in the total cross section ofHe4+He

Cited by 26 publications

References 8 publications

Modeling of transport phenomena in gases based on quantum scattering

Modeling of transport phenomena in gases based on quantum scattering

A Ramsauer–Townsend effect in liquid 3He

Ramsauer approach for light scattering on nonabsorbing spherical particles and application to the Henyey–Greenstein phase function

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