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Polyoxymethylene in Cometary Dust: Laboratory Tests

Published online by Cambridge University Press:  12 April 2016

D.C. Boice ,
D.W. Naegeli  and
W.F. Huebner
D.C. Boice
Affiliation:
Southwest Research InstituteP.O. Drawer 28510 San Antonio, TX 78228-0510USA
D.W. Naegeli
Affiliation:
Southwest Research InstituteP.O. Drawer 28510 San Antonio, TX 78228-0510USA
W.F. Huebner
Affiliation:
Southwest Research InstituteP.O. Drawer 28510 San Antonio, TX 78228-0510USA

Abstract

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We have investigated the stability of gas-phase formaldehyde oligomers and its implications for cometary science. Our experiments indicate that when a formaldehyde-methanol solution is vaporized in the mass spectrometer, high molecular mass POM species (45, 61, 75, 91, 105, 121, 135, 151, 165 amu) exist in the gas phase in the temperature range 473 K to 773 K. These laboratory results complement our previous experiments using a formaldehyde-water solution and indicate that formaldehyde oligomers are stable in the gas phase up to at least 6 monomeric units in length. Methanol is important in the end-capping process of the oligomers, leading to increased stability and a richer mass spectrum when compared to the formaldehyde-water solution. The results are consistent with mass spectra obtained by the Giotto PICCA instrument exhibiting alternating 14-16 amu mass peaks.

Type
Cometary Dust: Observations and Evolution
Information
International Astronomical Union Colloquium , Volume 126: Origin and Evolution of Interplanetary Dust , 1991 , pp. 265 - 268
Copyright
Copyright © Kluwer 1991

References

Boenhardt, H., Fechtig, H., and Vanysek, V. (1990) ‘The possible role of organic polymers in the structure and fragmentation of dust in the coma of comet P/Halley,’ Astron. Astrophys. 231, 543–547.Google Scholar
Boice, D.C., Naegeli, D.W., and Huebner, W.F. (1989) ‘Physico-chemical properties of formaldehyde-ice-dust mixtures,’ Proceedings of an International Workshop on Physics and Mechanics of Cometary Materials, ESA SP-302, 83–88.Google Scholar
Boice, D.C., Huebner, W.F., Sablik, M.J., and Konno, I. (1990) ‘Distributed coma sources and the CH4/CO ratio in comet Halley,’ Geophys. Res. Lett. 17, in press.CrossRefGoogle Scholar
Busca, G., Lamotte, J., Lavalley, J.-C., and Lorenzelli, V. (1987) ‘FT-IR study of the adsorption and transformation of formaldehyde on oxide surfaces,’ J. Am. Chem. Soc. 109, 5197–5202.CrossRefGoogle Scholar
Huebner, W.F. and Boice, D.C. (1989) ‘Polymers in comet comae,’ in Waite, J.H. Jr., Burch, J.L., and Moore, R.L. (eds.), AGU Monograph 54, pp. 453–456.Google Scholar
Huebner, W.F., Boice, D.C., Sharp, C.M., Korth, A., Lin, R.P., Mitchell, D.L., and Reme, H. (1987) ‘Evidence for first polymer in Comet Halley: Polyoxymethylene,’ Symposium on the Diversity and Similarity of Comets, ESA SP-278, 163–168.Google Scholar
Korth, A. et al. (1986) ‘Mass spectra of heavy ions near comet Halley,’ Nature 321, 335–336.CrossRefGoogle Scholar
Mahaffey, P. (1989) ‘SIMS of polyoxymethylene and questions of cometary dust composition,’ preprint.Google Scholar
Mitchell, D.L. et al. (1987) ‘Evidence for chain molecules enriched in carbon, hydrogen, and oxygen in comet Halley,’ Science 237, 626– 628.CrossRefGoogle ScholarPubMed
Moller, G. and Jackson, W.M. (1989) ‘Laboratory studies of polyoxymethylene: application to comets,’ Icarus, in press.Google Scholar
Moore, M.H. and Tanabe, T. (1990) ‘Mass spectra of sputtered polyoxymethylene - implications for comets,’ Astrophys. J. Lett., in press.CrossRefGoogle Scholar
Walker, J.F. (1964) Formaldehyde, Reinhold Publishers, New York.Google Scholar