Effect of porosity on the adsorption, desorption, trapping, and release of volatile gases by amorphous solid water
We compare the adsorption, desorption, trapping, and release of Ar, N2, O2, CO, and CH4 by dense (nonporous) and highly porous amorphous solid water (ASW) films. Molecular beam deposition techniques are used to control the porosity of the vapor‐deposited ASW thin films. Experiments where the gas spe...
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| Veröffentlicht in: | Journal of Geophysical Research. E. Planets 2001-12, Vol.106 (E12), p.33387-33392 |
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| container_title | Journal of Geophysical Research. E. Planets |
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| creator | Ayotte, Patrick Smith, R. Scott Stevenson, K. P. Dohnálek, Z. Kimmel, Greg A. Kay, Bruce D. |
| description | We compare the adsorption, desorption, trapping, and release of Ar, N2, O2, CO, and CH4 by dense (nonporous) and highly porous amorphous solid water (ASW) films. Molecular beam deposition techniques are used to control the porosity of the vapor‐deposited ASW thin films. Experiments where the gas species is deposited on top of and underneath dense and porous ASW are conducted. For the film thickness used in this study, the porous films are found to adsorb between 20 and 50 times more gas than the dense films. The desorption temperature of the adsorbed gas is also dependent on the porosity of the ASW film. Differences between desorption from porous and dense ASW films are attributed to differences in their ability to trap weakly physisorbed gases. The results are largely independent of the gas studied, confirming that the adsorption and trapping of gases are dominated by the ASW porosity. These findings show that laboratory studies must account for the growth conditions and their effects on ASW morphology in order to accurately predict the properties of astrophysical ices. |
| doi_str_mv | 10.1029/2000JE001362 |
| format | Article |
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Scott ; Stevenson, K. P. ; Dohnálek, Z. ; Kimmel, Greg A. ; Kay, Bruce D.</creator><creatorcontrib>Ayotte, Patrick ; Smith, R. Scott ; Stevenson, K. P. ; Dohnálek, Z. ; Kimmel, Greg A. ; Kay, Bruce D. ; Pacific Northwest National Lab. (PNNL), Richland, WA (United States)</creatorcontrib><description>We compare the adsorption, desorption, trapping, and release of Ar, N2, O2, CO, and CH4 by dense (nonporous) and highly porous amorphous solid water (ASW) films. Molecular beam deposition techniques are used to control the porosity of the vapor‐deposited ASW thin films. Experiments where the gas species is deposited on top of and underneath dense and porous ASW are conducted. For the film thickness used in this study, the porous films are found to adsorb between 20 and 50 times more gas than the dense films. The desorption temperature of the adsorbed gas is also dependent on the porosity of the ASW film. Differences between desorption from porous and dense ASW films are attributed to differences in their ability to trap weakly physisorbed gases. The results are largely independent of the gas studied, confirming that the adsorption and trapping of gases are dominated by the ASW porosity. These findings show that laboratory studies must account for the growth conditions and their effects on ASW morphology in order to accurately predict the properties of astrophysical ices.</description><identifier>ISSN: 0148-0227</identifier><identifier>EISSN: 2156-2202</identifier><identifier>DOI: 10.1029/2000JE001362</identifier><language>eng</language><publisher>Washington, DC: Blackwell Publishing Ltd</publisher><subject>ADSORPTION ; AMORPHOUS STATE ; ARGON ; Astronomy ; ASTROPHYSICS ; CARBON MONOXIDE ; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ; DESORPTION ; Earth, ocean, space ; Estimate the astrophysical conditions ; Exact sciences and technology ; External geophysics ; General, solar nebula, and cosmogony ; ICE ; METHANE ; NITROGEN ; OXYGEN ; POROSITY ; Snow. Ice. Glaciers ; Solar system ; THIN FILMS ; VAPOR DEPOSITED COATINGS</subject><ispartof>Journal of Geophysical Research. E. 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Scott</creatorcontrib><creatorcontrib>Stevenson, K. P.</creatorcontrib><creatorcontrib>Dohnálek, Z.</creatorcontrib><creatorcontrib>Kimmel, Greg A.</creatorcontrib><creatorcontrib>Kay, Bruce D.</creatorcontrib><creatorcontrib>Pacific Northwest National Lab. (PNNL), Richland, WA (United States)</creatorcontrib><title>Effect of porosity on the adsorption, desorption, trapping, and release of volatile gases by amorphous solid water</title><title>Journal of Geophysical Research. E. Planets</title><addtitle>J. Geophys. Res</addtitle><description>We compare the adsorption, desorption, trapping, and release of Ar, N2, O2, CO, and CH4 by dense (nonporous) and highly porous amorphous solid water (ASW) films. Molecular beam deposition techniques are used to control the porosity of the vapor‐deposited ASW thin films. Experiments where the gas species is deposited on top of and underneath dense and porous ASW are conducted. For the film thickness used in this study, the porous films are found to adsorb between 20 and 50 times more gas than the dense films. The desorption temperature of the adsorbed gas is also dependent on the porosity of the ASW film. Differences between desorption from porous and dense ASW films are attributed to differences in their ability to trap weakly physisorbed gases. The results are largely independent of the gas studied, confirming that the adsorption and trapping of gases are dominated by the ASW porosity. These findings show that laboratory studies must account for the growth conditions and their effects on ASW morphology in order to accurately predict the properties of astrophysical ices.</description><subject>ADSORPTION</subject><subject>AMORPHOUS STATE</subject><subject>ARGON</subject><subject>Astronomy</subject><subject>ASTROPHYSICS</subject><subject>CARBON MONOXIDE</subject><subject>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</subject><subject>DESORPTION</subject><subject>Earth, ocean, space</subject><subject>Estimate the astrophysical conditions</subject><subject>Exact sciences and technology</subject><subject>External geophysics</subject><subject>General, solar nebula, and cosmogony</subject><subject>ICE</subject><subject>METHANE</subject><subject>NITROGEN</subject><subject>OXYGEN</subject><subject>POROSITY</subject><subject>Snow. Ice. Glaciers</subject><subject>Solar system</subject><subject>THIN FILMS</subject><subject>VAPOR DEPOSITED COATINGS</subject><issn>0148-0227</issn><issn>2156-2202</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2001</creationdate><recordtype>article</recordtype><recordid>eNp9kVFvFCEUhYmxiZu2b_4AEqNPOxYuDLPzaJp1a9vYxFR9JBQuXXR2GIFa99-XZhrrk0_ckO-c3HMuIa85e88Z9CfAGDtfM8aFghdkAbxVDQCDl2TBuFw1DKB7RY5z_lFBJlslGV-QtPYebaHR0ymmmEPZ0zjSskVqXI5pKiGOS-rweS7JTFMYb5fUjI4mHNBkfDT4HQdTwoD0tn5kerOnZldV23iXaY5DcPTeFExH5MCbIePx03tIvn5cX5-eNZdXm0-nHy4bI5VUjUDlvPIODKgawFpgwrqO97298aZXygJHVCt0K4leMmex7wxftQjgBPbikLyZfWMuQWcbCtqtjeNY82re1qagY5V6N1NTir_uMBe9C9niMJgR6-IaVMdrU7KCyxm0taac0OsphZ1Je82ZfryA_vcCFX_75GuyNYNPZrQhP2tEDclFVzmYufva3P6_nvp882XNhVBV1MyikAv--Ssy6adWneha_f3zRjN18e1s00t9LR4Al06jYw</recordid><startdate>20011225</startdate><enddate>20011225</enddate><creator>Ayotte, Patrick</creator><creator>Smith, R. Scott</creator><creator>Stevenson, K. 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P. ; Dohnálek, Z. ; Kimmel, Greg A. ; Kay, Bruce D.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a4646-3e6df6fd2a26014cc203cd7199cbfa966c21ee68ed84ef40dce97a185e22d3e93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2001</creationdate><topic>ADSORPTION</topic><topic>AMORPHOUS STATE</topic><topic>ARGON</topic><topic>Astronomy</topic><topic>ASTROPHYSICS</topic><topic>CARBON MONOXIDE</topic><topic>CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS</topic><topic>DESORPTION</topic><topic>Earth, ocean, space</topic><topic>Estimate the astrophysical conditions</topic><topic>Exact sciences and technology</topic><topic>External geophysics</topic><topic>General, solar nebula, and cosmogony</topic><topic>ICE</topic><topic>METHANE</topic><topic>NITROGEN</topic><topic>OXYGEN</topic><topic>POROSITY</topic><topic>Snow. Ice. 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Res</addtitle><date>2001-12-25</date><risdate>2001</risdate><volume>106</volume><issue>E12</issue><spage>33387</spage><epage>33392</epage><pages>33387-33392</pages><issn>0148-0227</issn><eissn>2156-2202</eissn><abstract>We compare the adsorption, desorption, trapping, and release of Ar, N2, O2, CO, and CH4 by dense (nonporous) and highly porous amorphous solid water (ASW) films. Molecular beam deposition techniques are used to control the porosity of the vapor‐deposited ASW thin films. Experiments where the gas species is deposited on top of and underneath dense and porous ASW are conducted. For the film thickness used in this study, the porous films are found to adsorb between 20 and 50 times more gas than the dense films. The desorption temperature of the adsorbed gas is also dependent on the porosity of the ASW film. Differences between desorption from porous and dense ASW films are attributed to differences in their ability to trap weakly physisorbed gases. The results are largely independent of the gas studied, confirming that the adsorption and trapping of gases are dominated by the ASW porosity. These findings show that laboratory studies must account for the growth conditions and their effects on ASW morphology in order to accurately predict the properties of astrophysical ices.</abstract><cop>Washington, DC</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2000JE001362</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| source | Wiley Free Content; Wiley-Blackwell AGU Digital Library; Wiley Online Library Journals Frontfile Complete; Alma/SFX Local Collection |
| subjects | ADSORPTION AMORPHOUS STATE ARGON Astronomy ASTROPHYSICS CARBON MONOXIDE CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS DESORPTION Earth, ocean, space Estimate the astrophysical conditions Exact sciences and technology External geophysics General, solar nebula, and cosmogony ICE METHANE NITROGEN OXYGEN POROSITY Snow. Ice. Glaciers Solar system THIN FILMS VAPOR DEPOSITED COATINGS |
| title | Effect of porosity on the adsorption, desorption, trapping, and release of volatile gases by amorphous solid water |
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