Surface Physics

Scott, C G

doi:10.1088/0031-9112/27/4/049

Cited by 4 publications

(4 citation statements)

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“…Interaction models involving just linear point quadrupoles associated with a 3−d lattice were studied some forty years ago, analytically [89][90][91][92] and by classical simulations [93,94], as simplified models of solid nitrogen [95], and might now be revisited, also in terms of overall fourth-rank orientational order. For example, the low-temperature, room-pressure α phase of solid nitrogen is usually assumed to belong to space group P a3 (but space group P 2 1 3 is also possible [95,96]).…”

Section: Discussionmentioning

confidence: 99%

Computer simulation study of a mesogenic lattice model based on long-range dispersion interactions

Romano

2016

Phys. Rev. E

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In contrast to thermotropic biaxial nematic phases, for which some long sought for experimental realizations have been obtained, no experimental realizations are yet known for their tetrahedratic and cubatic counterparts, involving orientational orders of ranks 3 and 4, respectively, also studied theoretically over the last few decades. In previous studies, cubatic order has been found for hard-core or continuous models consisting of particles possessing cubic or nearly-cubic tetragonal or orthorhombic symmetries; in a few cases, hard-core models involving uniaxial (D ∞h −symmetric) particles have been claimed to produce cubatic order as well. Here we address by Monte Carlo simulation a lattice model consisting of uniaxial particles coupled by long-range dispersion interactions of the London-De Boer-Heller type; the model was found to produce no second-rank nematic but only fourth-rank cubatic order, in contrast to the nematic behavior long known for its counterpart with interactions truncated at nearest-neighbor separation.

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Section: Discussionmentioning

confidence: 99%

Computer simulation study of a mesogenic lattice model based on long-range dispersion interactions

Romano

2016

Phys. Rev. E

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“…For I Å 0 there is no spin-rotation effect although the contribu- Table 3. stant is 0.471 kHz (24) and therefore the effect in the complex is expected to be very small and has not been included.…”

Section: Constants Of N 2 -Ocsmentioning

confidence: 99%

Hyperfine and Tunneling Effects in the Microwave Spectrum of N2–OCS

Connelly

Duxon

Kennedy

et al. 1996

Journal of Molecular Spectroscopy

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“…The situation with solid nitrogen is no better than that for solid methane. Scott (1976) has reviewed the conflicting results obtained by numerous investigators for the structure of solid nitrogen. Although most of these investigators have not reported the quality and homogeneity of their specimens, most of these contradicting results and the non-reproducibility of their experimental data could be attributed to the lack of suitable powder specimens.…”

Section: Introductionmentioning

confidence: 99%

Specimen preparation of low-melting-point solidified gases for low-temperature powder diffractometry

Arzi¹

1982

J Appl Cryst

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The quality of powder specimens in diffraction experiments is very important. Any preferred orientation in the specimen under study affects the observed integrated intensities of the powder peaks and makes them unreliable; thus, results obtained from these intensities hardly appear to be trustworthy. The existing methods of powder preparation were considered to be unsuitable for samples such as isotopic methanes, nitrogen, oxygen, hydrogen, etc. which are gaseous at room temperature and have relatively low melting points. Therefore, a new method was developed for producing fine-grained powder specimens of solidified gases without preferred orientation directly from the gas phase using a specially designed liquid-helium cryostat which allowed visual inspection of the formation of powder in the specimen container. Subsequent neutron diffraction tests proved that the powder specimens prepared by this method were free of preferred orientations.

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Surface Physics

Cited by 4 publications

References 0 publications

Computer simulation study of a mesogenic lattice model based on long-range dispersion interactions

Computer simulation study of a mesogenic lattice model based on long-range dispersion interactions

Hyperfine and Tunneling Effects in the Microwave Spectrum of N2–OCS

Specimen preparation of low-melting-point solidified gases for low-temperature powder diffractometry

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