J/ApJS/234/6 IR absorbance spectra of CH4, C2H6, C3H8 & C4H10 (Turner+, 2018)
An infrared spectroscopic study toward the formation of alkylphosphonic acids
and their precursors in extraterrestrial environments.
Turner A.M., Abplanalp M.J., Blair T.J., Dayuha R., Kaiser R.I.
<Astrophys. J. Suppl. Ser., 234, 6 (2018)>
=2018ApJS..234....6T 2018ApJS..234....6T
ADC_Keywords: Molecular data ; Spectra, infrared
Keywords: astrobiology ; astrochemistry ; ISM: molecules ;
methods: laboratory: solid state ; techniques: spectroscopic
Abstract:
The only known phosphorus-containing organic compounds of
extraterrestrial origin, alkylphosphonic acids, were discovered in the
Murchison meteorite and have accelerated the hypothesis that reduced
oxidation states of phosphorus were delivered to early Earth and
served as a prebiotic source of phosphorus. While previous studies
looking into the formation of these alkylphosphonic acids have focused
on the iron-nickel phosphide mineral schreibersite and phosphorous
acid as a source of phosphorus, this work utilizes phosphine (PH3),
which has been discovered in the circumstellar envelope of IRC +10216,
in the atmosphere of Jupiter and Saturn, and believed to be the
phosphorus carrier in comet 67P/Churyumov-Gerasimenko. Phosphine ices
prepared with interstellar molecules such as carbon dioxide, water,
and methane were subjected to electron irradiation, which simulates
the secondary electrons produced from galactic cosmic rays penetrating
the ice, and probed using infrared spectroscopy to understand the
possible formation of alkylphosphonic acids and their precursors on
interstellar icy grains that could become incorporated into meteorites
such as Murchison. We present the first study and results on the
possible synthesis of alkylphosphonic acids produced from
phosphine-mixed ices under interstellar conditions. All functional
groups of alkylphosphonic acids were detected through infrared
spectroscopically, suggesting that this class of molecules can be
formed in interstellar ices.
Description:
In situ infrared data were collected by a Nicolet 6700 Fourier
Transform Infrared Spectrometer at 4cm-1 resolution throughout the
irradiation and temperature programmed desorption (TPD).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig2.dat 61 1814 The infrared absorbance spectra of methane,
ethane, propane and butane taken at 10K
fig/* . 73 The Figures 3-26 in CSV format with
a readme.txt file
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See also:
J/ApJ/662/750 : ν9 fundamental band of ethane (Vander+, 2007)
J/ApJ/757/46 : Hot methane (CH4) line list (Hargreaves+, 2012)
J/ApJ/789/2 : Methane partition function (Rey+, 2014)
J/ApJ/796/36 : PH2CN/CH3PH2 rotational transition freq. (Halfen+, 2014)
J/A+A/570/A12 : Spectroscopy of 1,2-propanediol (Bossa+, 2014)
J/MNRAS/440/1649 : ExoMol line lists for CH4 (Yurchenko+, 2014)
J/ApJ/813/12 : Empirical methane (CH4) line list (Hargreaves+, 2015)
J/A+A/605/A95 : CH4 & hot methane continuum hybrid line list (Yurchenko+, 2017)
Byte-by-byte Description of file: fig2.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 cm-1 WaveNum [503.3/3999.8] Wavenumber
11- 22 F12.9 --- Abs1 [-0.003/0.7] Methane (CH4) infrared spectra,
absorbance at 10K
24- 35 F12.9 --- Abs2 [-0.0009/0.6] Ethane (C2H6) infrared spectra,
absorbance at 10K
37- 48 F12.9 --- Abs3 [-0.002/0.5] Propane (C3H8) infrared spectra,
absorbance at 10K
50- 61 F12.9 --- Abs4 [-0.002/0.3] Butane (C4H10) infrared spectra,
absorbance at 10K
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 12-Mar-2018