Hopping Precession of Molecules in Crystalline Carbon Dioxide Films

Krainyukova, N. V.; Kuchta, B

doi:10.1007/s10909-016-1717-3

Cited by 10 publications

(14 citation statements)

References 10 publications

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“…We attribute this change to orientational changes of CO2 molecules in this temperature range: CO2 molecules reorient and forms intermediate range order (nanocrystals). There are few studies on orientational ordering in CO2 cubic ice (Torchet et al 1996;Kuchta & Etters 1988;Krainyukova & Kuchta 2017). Solid, crystalline CO2 ice has Pa3 symmetry in vacuum with four molecules per elementary cell placed along the cubic diagonals.…”

Section: Results and Analysismentioning

confidence: 99%

“…The molecules perform small librations around the diagonal (with the C atom on the diagonal) (Kuchta & Etters 1988). A recent THEED (Transmission High Energy Electron Diffraction) study on thin (∼10 nm) films deposited at ∼65 K reveals a more complicated rotational motions with the molecular tips (the oxygen atoms) hopping in 24 equivalent positions with a maximum deviation from the diagonal of about 30 degrees and decreasing from 15 to 70 K (Krainyukova & Kuchta 2017). …”

Section: Results and Analysismentioning

confidence: 99%

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Characterization of thin film CO2 ice through the infrared ν1 + ν3 combination mode

He¹,

Vidali²

2017

Monthly Notices of the Royal Astronomical Society

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Carbon dioxide is abundant in ice mantles of dust grains; some is found in the pure crystalline form as inferred from the double peak splitting of the bending profile at about 650 cm −1 . To study how CO 2 segregates into the pure form from water-rich mixtures of ice mantles and how it then crystallizes, we used Reflection Absorption InfraRed Spectroscopy (RAIRS) to study the structural change of pure CO 2 ice as a function of both ice thickness and temperature. We found that the ν 1 + ν 3 combination mode absorption profile at 3708 cm −1 provides an excellent probe to quantify the degree of crystallinity in CO 2 ice. We also found that between 20 and 30 K, there is an ordering transition that we attribute to reorientation of CO 2 molecules, while the diffusion of CO 2 becomes significant at much higher temperatures. In the formation of pure crystalline CO 2 in ISM ices, the rate limiting process is the diffusion/segregation of CO 2 molecules in the ice instead of the phase transition from amorphous to crystalline after clusters/islands of CO 2 are formed.

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Section: Results and Analysismentioning

confidence: 99%

Section: Results and Analysismentioning

confidence: 99%

Characterization of thin film CO2 ice through the infrared ν1 + ν3 combination mode

He¹,

Vidali²

2017

Monthly Notices of the Royal Astronomical Society

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“…gaseous carbon dioxide) was first deposited on carbon substrates inside the cryostat well below the sublimation points of polycrystalline films (T subl ~ 86 K for CO 2 ). Good quality thin solid polycrystalline films with the specific and intrinsic molecular dynamics [52] formed right after deposition that was confirmed by the diffractograms typical of polycrystalline CO 2 . It has been shown previously applying the precise analysis of the experimental diffraction intensities [52] that in polycrystalline films molecular axes noticeably deviate from the cubic space diagonals of the Pa3 structure.…”

Section: Capture Of Molecular Gases In Carbon Honeycombsmentioning

confidence: 55%

“…Good quality thin solid polycrystalline films with the specific and intrinsic molecular dynamics [52] formed right after deposition that was confirmed by the diffractograms typical of polycrystalline CO 2 . It has been shown previously applying the precise analysis of the experimental diffraction intensities [52] that in polycrystalline films molecular axes noticeably deviate from the cubic space diagonals of the Pa3 structure. The molecular tips tend to be oriented toward the empty spaces between two molecules in the nearest basal planes.…”

Section: Capture Of Molecular Gases In Carbon Honeycombsmentioning

confidence: 55%

Absorption of atomic and molecular species in carbon cellular structures (Review article)

Krainyukova

Kuchta

Firlej

et al. 2020

Low Temperature Physics

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The paper presents a brief review of the recent developments in the field of absorption of atomic and molecular species in carbon cellular structures. Such absorbing objects can be distinctly recognized among a large family of carbon porous materials owing to potential and already observed in experiments very high capacity to soak and to keep inside different substances, which at usual conditions outside the porous matrices may often stay only in a gaseous form. High capacity filling is attained owing to single graphene-like walls separating different cells in the whole structures providing their lightweight. This property of cellular structures makes them very promising for numerous technological applications such as hydrogen storage in fuel cells and molecular sieving in membranes made from such structures or for their usage in microelectronics, photovoltaics and production of Li-ion batteries. Independently of the targeted applications gases are good candidates for probing tests of carbon matrices themselves.

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“…There were analyzed two options. When we deposited gases well below T subl first a good quality polycrystalline films with the intrinsic molecular dynamics formed [14,18,28]. After gradual heating and further keeping condensates a few degrees lower T subl CO 2 molecules were absorbed by the carbon supporting films owing to fast diffusion and stronger interaction with pore walls as compared with interaction between molecules themselves.…”

Section: The Absorption-desorption Effectmentioning

confidence: 99%

Absorption-desorption of carbon dioxide in carbon honeycombs at elevated temperatures

Krainyukova

Bogdanov

Kuchta

2019

Low Temperature Physics

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The recently synthesized honeycomb carbon allotrope has numerous potential applications, in particular for storage of gases inside carbon matrices. In this work this carbon form was experimentally studied in its denser form in order to estimate the upper temperature limit for keeping a gas inside the cellular structure. Along with the previously reported random honeycombs of a zigzag type we have also revealed the densest armchair structure. The mechanism of absorption-desorption of carbon dioxide studied by means of high energy electron diffraction at low temperatures showed the two-stage character of the observed desorption at elevated temperatures. This effect is associated to the weaker or stronger bonding of molecules with pore walls depending on the specific configuration of channels with different sizes. We have found that complete desorption of CO 2 does not occur even at the temperatures about three times higher as compared with the sublimation point of carbon dioxide in our vacuum conditions.

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Hopping Precession of Molecules in Crystalline Carbon Dioxide Films

Cited by 10 publications

References 10 publications

Characterization of thin film CO2 ice through the infrared ν1 + ν3 combination mode

Characterization of thin film CO2 ice through the infrared ν1 + ν3 combination mode

Absorption of atomic and molecular species in carbon cellular structures (Review article)

Absorption-desorption of carbon dioxide in carbon honeycombs at elevated temperatures

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