Infrared spectra of complex organic molecules in astronomically relevant ice mixtures

Context . In the near future, high spatial and spectral infrared (IR) data of star-forming regions obtained by James Webb Space Telescope may reveal new solid-state features various species, including more intriguing classes chemical compounds. The identification complex organic molecules (COMs) in upcoming will only be possible when laboratory IR ice spectra these species under astronomically relevant conditions are available for comparison. For this purpose, systematic series measurements performed, providing high-resolution COMs. Here, pure methylamine (CH 3 NH 2 ) methylamine-containing ices discussed. Aims work is aimed at characterizing mid-IR (500–4000 cm ?1 , 20–2.5 ?m) mixed to provide accurate spectroscopic vibrational bands that most suited trace interstellar ices. Methods Fourier transform spectroscopy used record CH form with H O, 4 temperatures ranging from 15 160 K. combination HeNe laser (632.8 nm) interference was derive band strengths Results refractive index amorphous K determined as being 1.30 ± 0.01. Accurate information strength values systematically presented a large set different temperatures. Selected characterized their use tracers selected include following: antisymmetric stretch 2881.3 (3.471 ?m), symmetric 2791.9 (3.582 deformation bands, 1455.0 1478.6 (6.873 6.761 1420.3 (7.042 rock 1159.2 (8.621 ?m). Using recorded ground-based toward YSOs (Young Stellar Objects), upper-limits abundances derived. some YSOs, abundance less than 4% relative O.