[ { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/e7er9-vv411", "eprint_id": 10916, "eprint_status": "archive", "datestamp": "2023-08-22 04:53:42", "lastmod": "2023-10-16 23:10:41", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Celii-F-G", "name": { "family": "Celii", "given": "Francis G." } }, { "id": "Whitmore-P-M", "name": { "family": "Whitmore", "given": "Paul M." } }, { "id": "Janda-K-C", "name": { "family": "Janda", "given": "Kenneth C." } } ] }, "title": "Bakeout controller for the use of helium closed-cycle refrigerators in ultrahigh vacuum applications", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 1986 American Vacuum Society. \n\n\n\nWe are grateful to Professor Sten Samson for advice on low-temperature techniques, as well as for the thermocouple wire and the loan of a Si diode system for temperature calibration. This work was supported by the United States Office of Naval Research. \n\nArthur Amos Noyes Laboratory of Chemical Physics, Contribution No. 7236. \n\n[F.G.C. was an] Atlantic Richfield Foundation Fellow. \n\n[K.C.J. was a] Camille and Henry Dreyfus Foundation Fellow.", "abstract": "imple control electronics are described which provide automated bakeout of an ultrahigh vacuum (UHV) chamber equipped with a helium closed-cycle refrigerator. By preventing the refrigerator from reaching elevated temperatures (T>50 \u00b0C) during bakeout, these devices can be utilized in the ultrahigh vacuum environment.", "date": "1986-07", "date_type": "published", "publication": "Journal of Vacuum Science and Technology A", "volume": "4", "number": "4", "publisher": "American Vacuum Society", "pagerange": "1939-1941", "id_number": "CaltechAUTHORS:CELjvsta86", "issn": "0734-2101", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:CELjvsta86", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1116/1.573750", "primary_object": { "basename": "CELjvsta86.pdf", "url": "https://authors.library.caltech.edu/records/e7er9-vv411/files/CELjvsta86.pdf" }, "resource_type": "article", "pub_year": "1986", "author_list": "Celii, Francis G.; Whitmore, Paul M.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/9evcn-g8997", "eprint_id": 85617, "eprint_status": "archive", "datestamp": "2023-08-19 17:10:07", "lastmod": "2024-01-14 19:34:19", "type": "book_section", "metadata_visibility": "show", "creators": { "items": [ { "id": "Casassa-M-P", "name": { "family": "Casassa", "given": "M. P." } }, { "id": "Western-C-M", "name": { "family": "Western", "given": "Colin M." } }, { "id": "Janda-K-C", "name": { "family": "Janda", "given": "Kenneth C." } } ] }, "title": "Photodissociation of van der Waals Molecules -- Do Angular Momentum Constraints Determine Decay Rates?", "ispublished": "unpub", "full_text_status": "restricted", "note": "\u00a9 1984 American Chemical Society. \n\nReceived June 11, 1984. Published in print 28 September 1984. \n\nThe infrared spectroscopy of ethylene complexes was supported by the United States Department of Energy. The visible laser excited fluorescence work was supported by the National Science Foundation. The data for Figures 3 and 4 were obtained by Fritz Thommen and Dwight Evard using a single frequency laser borrowed from the San Francisco Laser Center supported by the National Science Foundation under Grant No. CHE79-16250. Kenneth C. Janda would like to acknowledge fellowships from the Alfred P. Sloan Foundation and the Camille and Henry Dreyfus Foundation. This is contribution no. 7029 from the Arthur Amos Noyes laboratory of Chemical Physics.", "abstract": "Experimental data pertinent to the vibrational predissociation mechanism of two types of van der Waals complex are presented and discussed. First, variations in the infrared band shape for excitation of the ethylene out-of-plane wag, \u03bd_7, in the series of molecules (C_2H_4)_2, C_2H_4:HF, C_2H_4:Ne are discussed in terms of structure and relaxation mechanisms. Second, rotationally resolved laser excited fluorescence spectra for NeBr_2 and NeCl_2 are presented. There is a strong dependence of decay rate on molecular structure. Relaxation lifetimes vary from less than 10^(-12) s for C_2H_4 dimer to greater than 10^(-5) s for NeCl_2. Trends observed are qualitatively predicted by consideration of linear and angular momentum gap arguments. Other possible interpretations are discussed.", "date": "1984-09-28", "date_type": "published", "publisher": "American Chemical Society", "place_of_pub": "Washington, DC", "pagerange": "305-319", "id_number": "CaltechAUTHORS:20180404-152225008", "isbn": "9780841208650", "book_title": "Resonances", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180404-152225008", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Department of Energy (DOE)" }, { "agency": "NSF", "grant_number": "CHE79-16250" }, { "agency": "Alfred P. Sloan Foundation" }, { "agency": "Camille and Henry Dreyfus Foundation" } ] }, "other_numbering_system": { "items": [ { "id": "7029", "name": "Arthur Amos Noyes Laboratory of Chemical Physics" } ] }, "doi": "10.1021/bk-1984-0263.ch016", "resource_type": "book_section", "pub_year": "1984", "author_list": "Casassa, M. P.; Western, Colin M.; et el." }, { "id": "https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/36vv4-s4784", "eprint_id": 10795, "eprint_status": "archive", "datestamp": "2023-08-22 02:23:03", "lastmod": "2023-10-16 23:06:33", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Casassa-M-P", "name": { "family": "Casassa", "given": "Michael P." } }, { "id": "Bomse-D-S", "name": { "family": "Bomse", "given": "David S." } }, { "id": "Beauchamp-J-L", "name": { "family": "Beauchamp", "given": "J. L." }, "orcid": "0000-0001-8839-4822" }, { "id": "Janda-K-C", "name": { "family": "Janda", "given": "Kenneth C." } } ] }, "title": "Infrared photochemistry of ethylene clusters", "ispublished": "pub", "full_text_status": "public", "keywords": "VIBRATIONAL STATES, RELAXATION, INFRARED RADIATION, LASER RADIATION, PHOTOCHEMICAL REACTIONS, ETHYLENE, MOLECULAR BEAMS, CROSS SECTIONS", "note": "\u00a9 1980 American Institute of Physics. \n\n(Received 26 March 1980; accepted 15 April 1980) \n\nThis work was supported by the Research Corporation and the Division of Chemical Sciences, Office of Basic Energy Sciences, U.S. Department of Energy under contract No. DE-AS03-76SF00767. Acknowledgment is made to the Donors of the Petroleum Research Fund, administered by the American Chemical Society, for partial support of this research. \n\n[M.P.C. was a] National Science Foundation Predoctoral Fellow. \n\n[D.S.B. was a] Josephine de Karman Fellow and Monsanto Fellow. \n\nDivision of Chemistry and Chemical Engineering, Contribution number 6183.\n\n
Published - CASjcp80.pdf
", "abstract": "Infrared irradiation of ethylene clusters formed in supersonic molecular beams, using a low power cw CO2 laser, results in the photodissociation of a large fraction of the van der Waals molecules. Under such conditions, infrared absorption intensity exhibits first-order power dependence and is readily detected as loss in molecular beam intensity. Intramolecular energy transfer rates, determined by measuring spectral linewidths, are shown to vary with the vibrational mode initially excited. Ethylene clusters containing one quantum of vibrational energy corresponding to the nun7 fundamental in the monomer (949 cm^\u20131) have a vibrationally predissociative lifetime of 0.33 psec. In comparison, the relaxation rate of ethylene-d4 clusters with one quantum of excitation corresponding to the nu12 (1078 cm^\u20131) mode of C2D4 is 0.7 psec.", "date": "1980-06-15", "date_type": "published", "publication": "Journal of Chemical Physics", "volume": "72", "number": "12", "publisher": "American Institute of Physics", "pagerange": "6805-6806", "id_number": "CaltechAUTHORS:CASjcp80", "issn": "0021-9606", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:CASjcp80", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Research Corporation" }, { "agency": "Department of Energy (DOE)", "grant_number": "DE-AS03-76SF00767" }, { "agency": "American Chemical Society Petroleum Research Fund" }, { "agency": "NSF Predoctoral Fellowship" }, { "agency": "Monsanto Corporation" } ] }, "other_numbering_system": { "items": [ { "id": "6183", "name": "Caltech Division of Chemistry and Chemical Engineering" } ] }, "doi": "10.1063/1.439174", "primary_object": { "basename": "CASjcp80.pdf", "url": "https://authors.library.caltech.edu/records/36vv4-s4784/files/CASjcp80.pdf" }, "resource_type": "article", "pub_year": "1980", "author_list": "Casassa, Michael P.; Bomse, David S.; et el." } ]