Publication
- Names
-
- W. Grundy
- B. Schmitt
- E. Quirico
- Title
- The temperature dependent spectra of α and β nitrogen ice with application to Triton
- Abstract
- We present measurements of the temperature dependence of the near-infrared spectra of α and β nitrogen ice, measured in transmission in 1-cm-thick samples. Our 0.9-cm-1 resolution spectra of β ice reveal that the 4650 cm-1 (2.15 μm) hand is a complex, temperature-dependent absorption, composed of at least two components. For lower temperature α ice, our spectra show a complex, temperature-dependent pattern involving several weak features in addition to the strong, narrow band we attribute to a double phonon transition. We apply our results in modeling telescopic spectra of Triton and conclude that the spectral data are consistent with a surface composed predominantly of β nitrogen ice at temperatures between 35.6 and 41 K, in the form of grains of order 1 cm or larger in size or in the form of a surface glaze with a depth of at least 6 cm.
- Keywords
- spectroscopy, transmission, absorption coefficient spectra, band position, band width, band intensity, band integrated intensity, band vibration mode, near-IR, thermal process, molecular solid, ice, N2, Triton, Pluto, TNO
- Content
- instrument-technique, sample, spectral data, band list data, planetary sciences
- Document type
- article
- Publication state
- published
- Doi
- 10.1006/icar.1993.1122
- Identifiers
- Experiment/Spectra
-
- NIR Optical constants spectrum of beta-N2 crystal at 43 K
- NIR Optical constants spectrum of beta-N2 crystal at 41 K
- NIR Optical constants spectrum of beta-N2 crystal at 38 K
- NIR Optical constants spectrum of beta-N2 crystal at 36.5 K
- NIR Optical constants spectrum of alpha-N2 crystal at 35 K
- NIR Optical constants spectrum of alpha-N2 crystal at 33 K