The Infrared Complex Refractive Index of Amorphous Ammonia Ice at 40 K (1.43–22.73 μm) and Its Relevance to Outer Solar System Bodies

Abstract A near-IR absorption band at 2.2 μm linked to ammonia-containing ice has been detected on icy bodies throughout the solar system and appears in the extensive volume of data for Pluto and Charon returned by New Horizons. This band is an important clue for understanding the abundance of ammonia and ammoniated compounds on the surface of outer solar system bodies and requires new laboratory data for its full analysis. To satisfy this data need, the complex refractive index of amorphous ammonia ice was calculated from experimental infrared transmission spectra with ice deposition and measurements conducted at 40 K, a characteristic surface temperature for outer solar system bodies. The measured imaginary part of the complex refractive index and associated band strength calculations are generally larger than prior published values for amorphous ammonia ice at 30 K. The complex refractive index for amorphous ammonia at 40 K computed in the mid-infrared region (2.5–22.73 μm) will also be valuable for interpreting observations of both solar system and astrophysical sources anticipated with the Near InfraRed Spectrograph and Mid-Infrared Instrument on the James Webb Space Telescope.

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Simultaneous visible and near-infrared time resolved observations of the outer Solar System object (29981) 1999 TD10

Icarus ◽

10.1016/j.icarus.2004.05.021 ◽

2004 ◽

Vol 171 (2) ◽

pp. 506-515 ◽

Cited By ~ 10

Author(s):

Béatrice E.A. Mueller ◽

Carl W. Hergenrother ◽

Nalin H. Samarasinha ◽

Humberto Campins ◽

Donald W. McCarthy

Keyword(s):

Solar System ◽

Near Infrared ◽

Outer Solar System ◽

Time Resolved ◽

Solar System Object

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Determination of Wavelength Accuracy in the Near-Infrared Spectral Region Based on NIST's Infrared Transmission Wavelength Standard SRM 1921

Applied Spectroscopy ◽

10.1366/0003702001949573 ◽

2000 ◽

Vol 54 (3) ◽

pp. 450-455 ◽

Cited By ~ 5

Author(s):

Stephen R. Lowry ◽

Jim Hyatt ◽

William J. McCarthy

Keyword(s):

Reference Material ◽

Standard Reference Material ◽

Spectral Region ◽

Near Infrared ◽

Cost Effective ◽

Infrared Transmission ◽

Internal Reference ◽

Mid Infrared ◽

Infrared Spectral Region ◽

Infrared Spectral

A major concern with the use of near-infrared (NIR) spectroscopy in many QA/QC laboratories is the need for a simple reliable method of verifying the wavelength accuracy of the instrument. This requirement is particularly important in near-infrared spectroscopy because of the heavy reliance on sophisticated statistical vector analysis techniques to extract the desired information from the spectra. These techniques require precise alignment of the data points between the vectors corresponding to the standard and sample spectra. The National Institute of Standards and Technology (NIST) offers a Standard Reference Material (SRM 1921) for the verification and calibration of mid-infrared spectrometers in the transmittance mode. This standard consists of a 38 μm-thick film of polystyrene plastic. While SRM 1921 works well as a mid-infrared standard, a thicker sample is required for use as a routine standard in the near-infrared spectral region. The general acceptance and proven reliability of polystyrene as a standard reference material make it a very good candidate for a cost-effective NIR standard that could be offered as an internal reference for every instrument. In this paper we discuss a number of the parameters in a Fourier transform (FT)-NIR instrument that can affect wavelength accuracy. We also report a number of experiments designed to determine the effects of resolution, sample position, and optics on the wavelength accuracy of the system. In almost all cases the spectral reproducibility was better than one wavenumber of the values extrapolated from the NIST reference material. This finding suggests that a thicker sample of polystyrene plastic that has been validated with the SRM 1921 standard would make a cost-effective reference material for verifying wavelength accuracy in a medium-resolution FT-NIR spectrometer.

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Survey of Cryogenic Nitrogen Thermomechanical Property Data Relevant to Outer Solar System Bodies

Earth and Space Science ◽

10.1029/2019ea000640 ◽

2020 ◽

Vol 7 (9) ◽

Cited By ~ 1

Author(s):

Dylan Sagmiller ◽

Jason Hartwig

Keyword(s):

Solar System ◽

Thermomechanical Property ◽

Outer Solar System ◽

Property Data ◽

Solar System Bodies

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Solar system astrometry, Gaia, and the large surveys – a huge step ahead to stellar occultations by distant small solar system bodies

Proceedings of the International Astronomical Union ◽

10.1017/s1743921317005488 ◽

2017 ◽

Vol 12 (S330) ◽

pp. 397-398

Author(s):

J. I. B. Camargo ◽

M. V. Banda-Huarca ◽

R. L. Ogando ◽

J. Desmars ◽

F. Braga-Ribas ◽

...

Keyword(s):

Solar System ◽

Outer Solar System ◽

Stellar Occultation ◽

Stellar Occultations ◽

Solar System Bodies

AbstractThe stellar occultation technique is a powerful tool to study distant small solar system bodies. Currently, around 2 500 trans-neptunian objects (TNOs) and Centaurs are known. With the astrometry from Gaia and large surveys like the Large Synoptic Survey Telescope (LSST), accurate predictions of occultation events will be available to tens of thousands of TNOs and Centaurs and boost the knowledge of the outer solar system.

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