IR SPECTRA OF PHOSPHINE ICES.

Doménech, José Luis

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https://hdl.handle.net/2142/122546 Copy

Description

Title

IR SPECTRA OF PHOSPHINE ICES.

Author(s)

Doménech, José Luis

Contributor(s)

• Maté, Belén
• Timón, Vicente
• Tanarro, Isabel
• Herrero, Victor Jose

Issue Date

2023-06-23

Keyword(s)

Mini-symposium: Infrared Spectroscopy in the JWST Era

Abstract

Phosphorus is an element of particular interest from the astronomical point of view, since it is an essential element for life. However, not many P-containing molecules have been found in space, both because a low cosmic abundance of P (P/H∼ 3 × 10−⁷) and because P is thought to be considerably depleted on dust grains. In particular, phosphine (PH₃), has only been observed in the atmospheres of Jupiter and Saturn, and, outside of the solar system, in the circumstellar envelope of IRC +10216.ᵃ Phosphine ice is thought to be a constituent of comets, and, in the ISM, a source for gas phase P upon sublimation from icy grains. In this work the infrared spectra of PH₃ ices and PH₃:H₂O ice mixtures have been studied both experimentally and theoretically. PH₃ ices were generated by vapour deposition at 10 K.ᵇ It was found that the amorphous to crystalline transition takes place between 35 and 40 K. A theoretical modelling of crystalline PH₃ and of a tentative amorphous PH₃ solid phase, as well as of amorphous PH₃:H₂O ice mixtures, has been performed. The infrared spectroscopic information given in this work is expected to be useful for the detection and quantification of PH₃ in astrophysical ices.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122546

DOI

https://doi.org/10.15278/isms.2023.7025

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