Density and infrared band strength of interstellar carbon monoxide (CO) ice analogues

C. González Díaz, H. Carrascosa, G. M. Muñoz Caro, M. A. Satorre, Y. J. Chen

研究成果: 雜誌貢獻期刊論文同行評審

5 引文 斯高帕斯(Scopus)


The motivation to study experimentally CO ice under mimicked interstellar conditions is supported by the large CO gas abundances and ubiquitous presence of CO in icy grain mantles. Upon irradiation in its pure ice form, this highly stable species presents a limited ion and photon-induced chemistry, and an efficient non-thermal desorption. Using infrared spectroscopy, single laser interference, and quadrupole mass spectrometry during CO ice deposition, the CO ice density was estimated as a function of deposition temperature. Only minor variations in the density were found. The proposed methodology can be used to obtain the density of other ice components at various deposition temperatures provided that this value of the density is known for one of these temperatures, which is typically the temperature corresponding to the crystalline form. The apparent tendency of the CO ice density to decrease at deposition temperatures below 14 K is in line with recently published colorimetric measurements. This work allowed us to revisit the value of the infrared band strength needed for calculation of the CO ice column density in infrared observations, 8.7 × 10-18 cm molecule-1 at 20 K deposition temperature.

頁(從 - 到)5744-5755
期刊Monthly Notices of the Royal Astronomical Society
出版狀態已出版 - 1 12月 2022


深入研究「Density and infrared band strength of interstellar carbon monoxide (CO) ice analogues」主題。共同形成了獨特的指紋。