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Adsorption of CF4 on graphite preplated with a monolayer of CF3Cl
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10.1063/1.3560655
/content/aip/journal/jcp/134/11/10.1063/1.3560655
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/11/10.1063/1.3560655
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Monolayer phase diagram for CF4 on graphite [after Zhang et al. (Ref. 7)].

Image of FIG. 2.
FIG. 2.

Monolayer phase diagram for CF3Cl on graphite [after Weimer et al. (Ref. 10)].

Image of FIG. 3.
FIG. 3.

Spectra of pure CF3Cl monolayers on graphite at T = 93 K. Spectra (a) are for liquid and spectra (b) are for solid monolayers.

Image of FIG. 4.
FIG. 4.

A series of spectra for a liquid CF3Cl monolayer exposed to increasing pressure of CF4 at 78 K.

Image of FIG. 5.
FIG. 5.

Ellipsometric coverage signal for a liquid CF3Cl monolayer (at the left end) exposed to increasing pressure of CF4. Open circles mark locations of spectra included in Fig. 4. Chemical potential on the x-axis is relative to its value at saturation.

Image of FIG. 6.
FIG. 6.

Frequency of the CF4 mode ν 3 in a film adsorbed on graphite, as a function of CF4 chemical potential: (a) for CF4 over an initial liquid monolayer of CF3Cl. Open circles are from spectra shown in Fig. 4; (b) for a pure CF4 film.

Image of FIG. 7.
FIG. 7.

Frequency of the CF4 mode ν 3 in a film adsorbed on graphite, as a function of CF4 chemical potential for six different runs, two (A and B) with the initial solid CF3Cl layer and four (C–F) with an initial liquid monolayer of CF3Cl.

Image of FIG. 8.
FIG. 8.

Ellipsometric coverage signal for an initial solid CF3Cl monolayer (at the left end) exposed to increasing pressure of CF4 at 93 K. Vertical bars mark the locations of spectra in Fig. 9.

Image of FIG. 9.
FIG. 9.

A series of spectra for a solid CF3Cl monolayer exposed to increasing pressure of CF4. Spectrum (a), just before the first CF4 layer step, shows only a small CF4 peak near 1280 cm−1. Spectra (b)–(d), after the step, show strong, blueshifted CF4 peaks, while the CF3Cl peaks are only slightly changed.

Image of FIG. 10.
FIG. 10.

Frequencies of the CF4 ν 3 mode (a) and the CF3Cl ν 4 mode (b) as functions of CF4 chemical potential. Vertical bars mark the locations of layer steps (from Fig. 8).

Image of FIG. 11.
FIG. 11.

Spectra for a solid CF3Cl monolayer exposed to increasing pressure of CF4 at T = 60 K: (a) before the second layer step; (b) after the step.

Image of FIG. 12.
FIG. 12.

Spectra for a liquid CF3Cl submonolayer (approximately 2/3 layer) exposed to increasing pressure of CF4 at T = 60 K: (a) before the second layer step; (b–d) after the step.

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/content/aip/journal/jcp/134/11/10.1063/1.3560655
2011-03-15
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Adsorption of CF4 on graphite preplated with a monolayer of CF3Cl
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/11/10.1063/1.3560655
10.1063/1.3560655
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