  A selection of five proteinogenic amino acids, namely glycine, isoleucine,
phenylalanine, tyrosine and tryptophan were studied in the mid-infrared and in
the far-infrared with the purpose to facilitate the search and identification
of these astrobiological and astrochemical relevant molecules in space
environments. The molar extinction coefficients ({\epsilon}) of all mid- and
far-infrared bands were determined as well as the integrated molar
absorptivities ({\psi}). The mid-infrared spectra of the five selected amino
acids were recorded also at three different temperatures from -180{\deg}C to
ambient temperature to +200{\deg}C. We measure the wavelength shift of the
infrared bands caused by temperature and, for the most relevant or
temperature-sensitive infrared bands, a series of linear equations were
determined relating wavelength position with temperature. Such equations may
provide estimates of the temperature of these molecules once detected in
astrophysical objects and with the reported values of {\epsilon} and {\psi}, it
will be possible to estimate the relative abundance of these molecules in space
environments.
