Development and Operation of a Hemi-Ellipsoidal Mirror Infrared Reflectometer from 2 to 34 micrometers

Wood, B E; Pipes, J. G.; Smith, Alice M.; Roux, J. A.

doi:10.21236/ada012878

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2022

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“…These latter two values scarcely changed at higher temperatures, but the fringe patterns were less uniform. Weak or unusual behavior in fringe patterns for allene has been described in a technical report, but not in the peer-reviewed literature …”

Section: Resultsmentioning

confidence: 97%

Infrared Spectra and Intensities of Amorphous and Crystalline Allene

Hudson

Yarnall

2022

ACS Earth Space Chem.

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The infrared (IR) spectra, including spectral intensities, of solid hydrocarbons are of interest to astrochemists and astronomers for the relevance of these compounds to surface chemistry in the outer solar system and beyond. However, although the vibrational modes and IR peak positions of many such compounds have long been studied, much less attention has been paid to the IR intensities needed to quantify both astronomical observations and laboratory results. Here we present mid- and near-IR transmission spectra of a relatively little-studied solid hydrocarbon, allene (1,2-propadiene). Spectra of both amorphous and polycrystalline allene are shown for the first time along with optical constants, band strengths, and absorption coefficients. We also report a density and refractive index (670 nm) for each form of solid allene. A radiation-chemical experiment on allene’s formation is described, as are some applications and suggestions for future work.

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Section: Resultsmentioning

confidence: 97%