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Title: Interactions of CCl{sub 4} with thin D{sub 2}O amorphous ice films, Part 1: A nanoscale probe of ice morphology

Abstract

High sensitivity temperature-programmed desorption mass spectrometry (TPDMS) was used in order to investigate the adsorption of carbon tetrachloride on thin ({approximately}500 ML) amorphous D{sub 2}O ice films at 95 K. The TPDMS experiments demonstrate that the desorption kinetics of CCl{sub 4} are extremely sensitive to the ice morphology. At submonolayer coverages, the adsorption of CCl{sub 4} on ice films prepared by vapor deposition at 130 K results in TPD spectra which consist of a single desorption feature {alpha}-CCl{sub 4} at 133--140 K. The TPD spectrum of CCl{sub 4} from ice films vapor-deposited at 95 K, however, consists of three desorption peaks labeled {sigma}, {delta}-, and {epsilon}-CCl{sub 4} at 145, 180, and 190 K, respectively. The authors attribute the observed differences in the TPD spectra of CCl{sub 4} from the two types of ice to differences in the microstructure of the ice surface. D{sub 2}O vapor deposition at 95 K apparently results in the formation of microporous amorphous ice, while deposition at 130 K results in the formation of pore-free, solid ice. Analysis of the TPD spectra demonstrates that CCl{sub 4} adsorption on ice prepared at 130 K results in the formation of metastable, two-dimensional islands. CCl{sub 4} adsorption on icemore » prepared at 95 K, however, proceeds through formation of three-dimensional clusters in the pores of microscopically rough ice. At very low coverages, small CCl{sub 4} clusters are trapped at the ice surface during TPD. Trapped CCl{sub 4} evolves into the gas phase at two different temperatures giving rise to {delta}- and {epsilon}-CCl{sub 4} desorption stat4es. The dependence of {delta}- and {epsilon}-CCl{sub 4} yields on the temperature of ice file deposition indicates that two structurally different forms of ice coexist at temperatures between 95 and 130 K.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (US)
OSTI Identifier:
20026923
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical; Journal Volume: 104; Journal Issue: 11; Other Information: PBD: 23 Mar 2000
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; CARBON TETRACHLORIDE; ADSORPTION; HEAVY WATER; ICE; FILMS; MORPHOLOGY; SURFACES; ATMOSPHERIC CHEMISTRY; OZONE LAYER

Citation Formats

Sadtchenko, V., Knutsen, K., Giese, C.F., and Gentry, W.R. Interactions of CCl{sub 4} with thin D{sub 2}O amorphous ice films, Part 1: A nanoscale probe of ice morphology. United States: N. p., 2000. Web. doi:10.1021/jp9926185.
Sadtchenko, V., Knutsen, K., Giese, C.F., & Gentry, W.R. Interactions of CCl{sub 4} with thin D{sub 2}O amorphous ice films, Part 1: A nanoscale probe of ice morphology. United States. doi:10.1021/jp9926185.
Sadtchenko, V., Knutsen, K., Giese, C.F., and Gentry, W.R. Thu . "Interactions of CCl{sub 4} with thin D{sub 2}O amorphous ice films, Part 1: A nanoscale probe of ice morphology". United States. doi:10.1021/jp9926185.
@article{osti_20026923,
title = {Interactions of CCl{sub 4} with thin D{sub 2}O amorphous ice films, Part 1: A nanoscale probe of ice morphology},
author = {Sadtchenko, V. and Knutsen, K. and Giese, C.F. and Gentry, W.R.},
abstractNote = {High sensitivity temperature-programmed desorption mass spectrometry (TPDMS) was used in order to investigate the adsorption of carbon tetrachloride on thin ({approximately}500 ML) amorphous D{sub 2}O ice films at 95 K. The TPDMS experiments demonstrate that the desorption kinetics of CCl{sub 4} are extremely sensitive to the ice morphology. At submonolayer coverages, the adsorption of CCl{sub 4} on ice films prepared by vapor deposition at 130 K results in TPD spectra which consist of a single desorption feature {alpha}-CCl{sub 4} at 133--140 K. The TPD spectrum of CCl{sub 4} from ice films vapor-deposited at 95 K, however, consists of three desorption peaks labeled {sigma}, {delta}-, and {epsilon}-CCl{sub 4} at 145, 180, and 190 K, respectively. The authors attribute the observed differences in the TPD spectra of CCl{sub 4} from the two types of ice to differences in the microstructure of the ice surface. D{sub 2}O vapor deposition at 95 K apparently results in the formation of microporous amorphous ice, while deposition at 130 K results in the formation of pore-free, solid ice. Analysis of the TPD spectra demonstrates that CCl{sub 4} adsorption on ice prepared at 130 K results in the formation of metastable, two-dimensional islands. CCl{sub 4} adsorption on ice prepared at 95 K, however, proceeds through formation of three-dimensional clusters in the pores of microscopically rough ice. At very low coverages, small CCl{sub 4} clusters are trapped at the ice surface during TPD. Trapped CCl{sub 4} evolves into the gas phase at two different temperatures giving rise to {delta}- and {epsilon}-CCl{sub 4} desorption stat4es. The dependence of {delta}- and {epsilon}-CCl{sub 4} yields on the temperature of ice file deposition indicates that two structurally different forms of ice coexist at temperatures between 95 and 130 K.},
doi = {10.1021/jp9926185},
journal = {Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical},
number = 11,
volume = 104,
place = {United States},
year = {Thu Mar 23 00:00:00 EST 2000},
month = {Thu Mar 23 00:00:00 EST 2000}
}