THz and IR spectroscopy of astrophysical ice analogs
Arsenii A. Gavdush,1,2,* Barbara M. Giuliano,3, B. Müller,3, Gennady A. Komandin,1,
Kirill I. Zaytsev,1,2, Alexei V. Ivlev,3, and P. Caselli,3;
1 - Prokhorov General Physics Institute of RAS, Moscow, 119991, Russia
2 - Bauman Moscow State Technical University, Moscow, 105005, Russia
3 - Max-Planck-Institut für extraterrestrische Physik, Garching bei München 85748, Germany
(*) E-mail: arsenii.a.gavdush@gmail.com
Abstract
The knowledge of the complex dielectric permittivity of ices as one of the most common kind of dense matter in the Universe [1] is the key to solve many relevant problems in astrophysics. Recently, a strong potential of THz pulsed spectroscopy as an instrument for studying the interstellar and circumstellar ice analogs was revealed [2]. In this work we present a method for accurate broadband spectroscopy that allows reconstruction of the complex dielectric permittivity of ices. It exploits the advantages of THz pulsed spectroscopy (TPS) to merge TPS data with the data from Fourier-transform IR spectroscopy (FTIR). Kramers-Kronig relations are of key importance for calibration of the merged broadband data. The developed method was used to study complex dielectric permittivity of CO and CO2 ices in the frequency range of 0.3 – 12.0 THz.
[1] A.C.A. Boogert et al., Annual Review of Astronomy & Astrophysics 53, 541 (2015).
[2] B.M. Giuliano et al., Astronomy & Astrophysics 629, A112 (2019).
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Speaker
Arsenii Gavdush
Prokhorov General Physics Institute of RAS
Russia
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