Structure of crystalline water ice formed through neon matrix sublimation under cryogenic and vacuum conditions

Sato, Reo; Taniguchi, Satoshi; Numadate, Naoki; Hama, Tetsuya

doi:10.1063/5.0150927

Cited by 1 publication

(3 citation statements)

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“…Drastic decreases in the wavenumbers of the O–H stretching mode are observed at around 152 and 167 K. Figure a shows that the spectral features change significantly in the temperature range of 152–155 K. The decrease in wavenumber at around 152 K is attributed to the crystallization from LDA ice, considering the spectral feature at 155 K is similar to that of crystalline ice I . Although ice I is I c , I h , or a mixture of I c and I h , − the ice samples of the present study were assigned to ice I c because the thicknesses of the samples were thin enough (25 ± 5 nm). As shown in Figures d and b, no significant changes in the spectral feature and wavenumber are observed in the range of 156–164 K. This indicates that the transition from LDA ice to ice I c approximately completed in the temperature range of 152–155 K, which corresponds to about 36 s. At temperatures above 167 K, the O–H stretching band shifts to lower wavenumbers, as shown in Figures d and c.…”

Section: Resultsmentioning

confidence: 72%

“…Ice I sd has been mainly observed in relatively thicker samples made by vapor deposition . On the other hand, thin samples exist as ice I c because stacking faults are less likely to be present in thin samples. − From the observations using cryogenic transmission electron microscopy (TEM), Kobayashi and Yasuda found that deposited ice at 95 K with 20 nm in thickness was ice I c . From the TEM observation, Kouchi et al showed that ice deposited at 120 K with 45 nm in thickness was also ice I c .…”

Section: Introductionmentioning

confidence: 99%

“…From the TEM observation, Kouchi et al showed that ice deposited at 120 K with 45 nm in thickness was also ice I c . Using reflection high-energy electron diffraction (RHEED), Sato et al showed that ice crystallized at 143 K from amorphous ice with 36 monolayers was a mixture of ice I c and ice I h . In addition, pure ice I c was formed from hydrogen hydrate through an amorphous state and annealing of the ice XVII phase. , …”

Section: Introductionmentioning

confidence: 99%

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Effects of Deposition Temperature on Phase Transition of Amorphous Ice

Kina,

Ono,

Yoshida

et al. 2024

J. Phys. Chem. C

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To investigate the effects of deposition temperature, T d , on the phase transition of amorphous ice with heating, the infrared spectra of ice deposited at temperatures of 6−160 K were measured. From the changing rate of the wavenumber of the O−H symmetric stretching mode with heating, the transition processes from high-density amorphous (HDA) ice to crystalline hexagonal ice I h via low-density amorphous (LDA) ice and ice I c were analyzed. The results show that the structure of the deposited ice depends on T d and is classified into six types: (i) HDA ice at T d < 20 K, (ii) a mixture of HDA and LDA ice at 20 K < T d < 80 K, (iii) LDA ice at 80 K < T d < 130 K, (iv) a mixture of LDA ice and I c at 130 K < T d < 140 K, (v) I c at 140 K < T d < 150 K, and (vi) a mixture of I c and I h at T d > ∼150 K. Furthermore, the processes of the structural transitions from the deposited ice with heating reflect T d . These results have important implications for the chemical evolution processes in interstellar molecular clouds.

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