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

A combination band due to a mechanism whereby a photon excites two or morevibrational modes ({\it e.g.} a bend and a stretch) of an individual moleculeis commonly seen in laboratory and astronomical spectroscopy. Here, we presentevidence of a much less commonly seen combination band $-$ one where a photonsimultaneously excites two adjacent molecules in an ice. In particular, wepresent near-infrared spectra of laboratory CO/N$_2$ ice samples where weidentify a band at 4467.5 cm$^{-1}$ (2.239 $\mu$m) that results from singlephotons exciting adjacent pairs of CO and N$_2$ molecules. We also present anear-infrared spectrum of Neptune's largest satellite Triton taken with theGemini-South 8.1 meter telescope and the Immersion Grating InfraredSpectrograph (IGRINS) that shows this 4467.5 cm$^{-1}$ (2.239 $\mu$m) CO-N$_2$combination band. The existence of the band in a spectrum of Triton indicatesthat CO and N$_2$ molecules are intimately mixed in the ice rather thanexisting as separate regions of pure CO and pure N$_2$ deposits. Our finding isimportant because CO and N$_2$ are the most volatile species on Triton and sodominate seasonal volatile transport across its surface. Our result will placeconstraints on the interaction between the surface and atmosphere of Triton. 1

A New Two-Molecule Combination Band as Diagnostic of Carbon Monoxide Diluted in Nitrogen Ice On Triton