Identification of a unique VUV photoabsorption band of carbonic acid for its identification in radiation and thermally processed water-carbon dioxide ices

Carbonic acid was synthesized within an ice containingwater and carbon dioxide by irradiation of similar to 9 eV photons. Vacuum UltraViolet (VUV)/UltraViolet (UV) photoabsorption spectra of the irradiated ice revealed absorption features from carbon dioxide, ozone, water, carbon monoxide and oxygen...

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Bibliographic Details
Published in:Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Main Authors: Pavithraa, S., Lo, J-, I, Cheng, B-M, Sekhar, B. N. Raja, Mason, N. J., Sivaraman, B.
Other Authors: 應用化學系, Department of Applied Chemistry
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
Astrochemistry
Methods
Laboratory
Solid state
Techniques
Spectroscopic
Carbonic acid
Online Access:http://hdl.handle.net/11536/152320
https://doi.org/10.1016/j.saa.2019.02.037
Description
Summary:Carbonic acid was synthesized within an ice containingwater and carbon dioxide by irradiation of similar to 9 eV photons. Vacuum UltraViolet (VUV)/UltraViolet (UV) photoabsorption spectra of the irradiated ice revealed absorption features from carbon dioxide, ozone, water, carbon monoxide and oxygen in addition to a band peaking at similar to 200 nm which is identified to be characteristic of carbonic acid. After thermal processing of the irradiated ice leading to desorption of the lower volatile ices, a pure carbonic acid spectrum is identified starting from 170 K until sublimation above 230 K. Therefore the similar to 200 nm band in the VUV region corresponding to carbonic acid is proposed to be a unique identifier in mixed ices, rich in water and carbon dioxide typically encountered on planetary and satellite surfaces. (C) 2019 Elsevier B.V. All rights reserved.

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