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

• DOI: 10.1093/mnras/stac3122
• Publication Date: 2022-10-30T02:40:03Z
• Authors: C González Díaz; H Carrascosa; G M Muñoz Caro; M Á Satorre; Y-J Chen
• Keywords: Interstellar ice; Deposition; Thermal desorption

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