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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

H2O is the most abundant component of astrophysical ices. In most lines ofsight it is not possible to fit both the H2O 3 um stretching, the 6 um bendingand the 13 um libration band intensities with a single pure H2O spectrum.Recent Spitzer observations have revealed CO2 ice in high abundances and it hasbeen suggested that CO2 mixed into H2O ice can affect relative strengths of the3 um and 6 um bands. We used laboratory infrared transmission spectroscopy ofH2O:CO2 ice mixtures to investigate the effects of CO2 on H2O ice spectralfeatures at 15-135 K. We find that the H2O peak profiles and band strengths aresignificantly different in H2O:CO2 ice mixtures compared to pure H2O ice. Inall H2O:CO2 mixtures, a strong free-OH stretching band appears around 2.73 um,which can be used to put an upper limit on the CO2 concentration in the H2Oice. The H2O bending mode profile also changes drastically with CO2concentration; the broad pure H2O band gives way to two narrow bands as the CO2concentration is increased. This makes it crucial to constrain the environmentof H2O ice to enable correct assignments of other species contributing to theinterstellar 6 um absorption band. The amount of CO2 present in the H2O ice ofB5:IRS1 is estimated by simultaneously comparing the H2O stretching and bendingregions and the CO2 bending mode to laboratory spectra of H2O, CO2, H2O:CO2 andHCOOH.Comment: 12 pages, 11 figures, accepted by A&

Effects of CO2 on H2O band profiles and band strengths in mixed H2O:CO2 ices

Effects of CO₂ on H₂O band profiles and band strengths in mixed H₂O:CO₂ ices