Ion irradiation of crystalline H 2O–ice: Effect on the 1.65-μm band
We have found that 0.8 MeV proton irradiation of crystalline H 2O–ice results in temperature dependent amorphization. The H 2O–ice's phase was determined using the near infrared spectrum from 1.0 μm (10,000 cm −1) to 2.5 μm (4000 cm −1). In crystalline H 2O–ice, the 1.65-μm (6061 cm −1) band is...
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Published in | Icarus (New York, N.Y. 1962) Vol. 183; no. 1; pp. 207 - 214 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Elsevier Inc
2006
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Subjects | |
Online Access | Get full text |
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Summary: | We have found that 0.8 MeV proton irradiation of crystalline H
2O–ice results in temperature dependent amorphization. The H
2O–ice's phase was determined using the near infrared spectrum from 1.0 μm (10,000 cm
−1) to 2.5 μm (4000 cm
−1). In crystalline H
2O–ice, the 1.65-μm (6061 cm
−1) band is strong while it is nearly absent in the amorphous spectrum [Schmitt, B., Quirico, E., Trotta, F., Grundy, W.M., 1998. In: Schmitt, B., de Bergh, C., Festou, M. (Eds.), Solar System Ices. Kluwer Academic, Norwell, MA, 1998, pp. 199–240]. In this experiment, at low temperatures (9, 25, and 40 K), irradiation of crystalline H
2O–ice produced the amorphous H
2O–ice's spectrum. However, at 50 K, some crystalline absorptions persisted after irradiation and at 70 and 100 K the crystalline spectrum showed only slight changes after irradiation. Our results agree with previous H
2O–ice irradiation studies examining the crystalline peaks near 44 and 62 μm by Moore and Hudson [Moore, M.H., Hudson, R.L., 1992. Astrophys. J. 401, 353–360] and near 3.07 μm by Strazzulla et al. [Strazzulla, G., Baratta, G.A., Leto, G., Foti, G., 1992. Europhys. Lett. 18, 517–522] and by Leto and Baratta [Leto, G., Baratta, G.A., 2003. Astron. Astrophys. 397, 7–13]. We present a method of measuring band areas to quantify the phase and radiation dose of icy Solar System surfaces. |
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ISSN: | 0019-1035 1090-2643 |
DOI: | 10.1016/j.icarus.2006.02.006 |