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Potassium spin polarization lifetime for a 30-carbon chain siloxane film

Author(s): Hibberd, Amber M.; Bergman, Susanna L.; Zhong, Yu Lin; Bernasek, Steven L.

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Abstract: The siloxane film derived from the 30-carbon chain triacontyltrichlorosilane (TCTS) is studied as an anti-relaxation coating for atomic vapor cells. The longitudinal spin relaxation lifetime of optically pumped potassium atoms in the presence of TCTS is measured and the average number of non-relaxing atom-wall collisions, or bounces, enabled by the coated surface is determined. X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) of TCTS were performed to investigate changes in chemical states and surface morphology of TCTS arising from K atom deposition on the film surface. TCTS was found to give approximately 530 bounces. Following lifetime measurements, K2p signals were clearly observed in XPS spectra. AFM images display non-preferential K deposition on the TCTS surface, however additional AFM studies with a TCTS surface exposed to Rb atoms show deposition occurs along surface defects. In agreement, Rb is found to preferentially deposit along the step edges of an 18-carbon chain monolayer film derived from 1-Octadecene. Finally, AFM indicates a much smoother surface for a tetracontane coating relative to TCTS. The importance of siloxane surface morphology versus film thickness with respect to coating performance is discussed.
Publication Date: 7-Nov-2012
Electronic Publication Date: 2-Nov-2012
Citation: Hibberd, Amber M., Bergman, Susanna L., Zhong, Yu Lin, Bernasek, Steven L. (2012). Potassium spin polarization lifetime for a 30-carbon chain siloxane film. The Journal of Chemical Physics, 137 (17), 174703 - 174703. doi:10.1063/1.4761934
DOI: doi:10.1063/1.4761934
ISSN: 0021-9606
EISSN: 1089-7690
Pages: 174703-1 - 174703-9
Type of Material: Journal Article
Journal/Proceeding Title: The Journal of Chemical Physics
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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