English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We measure the band strengths in the far-infrared region of interstellar iceanalogs of astrophysically relevant species, such as H$_2$O, CO$_2$, CH$_3$OH,and NH$_3$, deposited at low temperature (8-10 $\mathrm{K}$), followed bywarm-up, to induce amorphous-crystalline phase transitions when relevant. Thespectra of pure H$_2$O, NH$_3$, and CH$_3$OH ices have been measured in thenear-, mid- and far-infrared spectroscopic regions using the InterstellarAstrochemistry Chamber (ISAC) ultra-high-vacuum setup. In addition,far-infrared spectra of NH$_3$ and CO$_2$ were measured using a differentset-up equipped with a bolometer detector. Band strengths in the far-infraredregion were estimated using the corresponding near- and mid-infrared values asa reference. We also performed theoretical calculations of the amorphous andcrystalline structures of these molecules using solid state computationalprograms at density functional theory (DFT) level. Vibrational assignment andmode intensities for these ices were predicted. Infrared band strengths in the25-500 ${\mu}$m range have been determined for the considered ice samples bydirect comparison in the near- and mid-infrared regions. Our values werecompared to those we calculated from the literature complex index ofrefraction. We found differences of a factor of two between the two sets ofvalues. The calculated far-infrared band strengths provide a benchmark forinterpreting the observational data from future space telescope missions,allowing the estimation of the ice column densities.

Interstellar ice analogs: band strengths of H$_2$O, CO$_2$, CH$_3$OH, and NH$_3$ in the far-infrared region