標題: | Identification of a unique VUV photoabsorption band of carbonic acid for its identification in radiation and thermally processed water-carbon dioxide ices |
作者: | Pavithraa, S. Lo, J-, I Cheng, B-M Sekhar, B. N. Raja Mason, N. J. Sivaraman, B. 應用化學系 Department of Applied Chemistry |
關鍵字: | Astrochemistry;Methods;Laboratory;Solid state;Techniques;Spectroscopic |
公開日期: | 15-五月-2019 |
摘要: | 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. |
URI: | http://dx.doi.org/10.1016/j.saa.2019.02.037 http://hdl.handle.net/11536/152320 |
ISSN: | 1386-1425 |
DOI: | 10.1016/j.saa.2019.02.037 |
期刊: | SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY |
Volume: | 215 |
起始頁: | 130 |
結束頁: | 132 |
顯示於類別: | 期刊論文 |