"Infrared Light Revealing Vibrations on Solid Materials: From the Laboratory to Space"

Observing infrared radiation interacting with a solid allows us to probe characteristic vibrational modes of that solid. This makes it possible to access the structure of a solid even if it is outside planet Earth. The analysis of this information, collected by telescopes operating in the infrared range, depends on previous experiments carried out in a laboratory. In this seminar we will examine how measurements of electromagnetic radiation absorption in the infrared range can reveal information about the structure of molecular ices. In these materials, each site of the crystal lattice contains a molecule, and not simply an atom. Their spectra show characteristics of solid samples combined with those of gaseous samples. The degree of disorder [1] in these samples is studied in the laboratory by combining two approaches: (i) varying the growth temperature of films of these ices and (ii) irradiating these films with beams of energetic ions produced by an ion accelerator [2].

 

References:

[1] S. L. A. Mello, R. C. Pereira, C. F. S. Codeço, R. Martinez, E. F. da Silveira, and M. M. Sant’Anna, The Journal of Physical Chemistry A  128 (2024) 7073-7083

[2] R. C. Pereira, A. L. F. de Barros, C. A. P da Costa , P. R. B. Oliveira, D. Fulvio, and E. F. da Silveira,  Ion Irradiation of Acetylene Ice in the ISM and the Outer Solar System: Laboratory Simulations. Mon. Not. R. Astron. Soc 495 (2020) 40−57.

Transmisión en vivo vía bit.ly/YouTube_ICF

Participante: Dr. Marcelo M. Sant'Anna

Institución: Universidad Federal de Rio de Janeiro

Fecha y hora: Este evento terminó el Viernes, 07 de Noviembre de 2025