期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 72, 期 5, 页码 1007-1013出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2008.12.030
关键词
Nitrous oxide; Nitrogen dioxide; Dinitrogen tetroxide; Infrared spectroscopy; Interstellar ices; Band strengths
类别
资金
- Italian Space Agency [1/015107/0]
We present novel measurements of the refractive index, density and integrated band strengths of mid-infrared features of solid N2O at 16 K and of NO2 and N2O4 in two frozen NO2:N2O4 mixtures deposited at 16 and 60 K. The refractive index and density measurements were performed also for frozen O-2 deposited at 16 K. In this case, the integrated band strength values could not be determined since O-2 is a homonuclear molecule and therefore its fundamental mode is not infrared active. The solid samples were analysed by infrared spectroscopy in the 8000 divided by 800 cm(-1) range. The sample thickness was measured by the interference Curve obtained using a He-Ne laser operating at 543 nm. The refractive index at this laser wavelength was obtained, by numerical methods, from the measured amplitude of the interference curve. The density values were obtained using the Lorentz-Lorenz relation. Integrated band strength values were then obtained by a linear fit of the integrated band intensities plotted versus column density Values. The astrophysical relevance of these novel measurements is briefly discussed. (C) 2008 Elsevier B.V. All rights reserved.
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