The efficient photodesorption of nitric oxide (NO) ices A laboratory astrophysics study

TL;DR

This study quantifies the UV-induced photodesorption of nitric oxide ices, revealing high efficiency relevant to interstellar chemistry, and compares it with other molecules to enhance understanding of molecular evolution in space.

Contribution

The paper provides the first quantitative measurements of NO ice photodesorption using synchrotron radiation, demonstrating its high efficiency in astrophysical environments.

Findings

NO photodesorption yield is about 1e-2 molecules per photon.

Photodesorption of NO is highly efficient under interstellar UV conditions.

Results are compared with other molecules' photodesorption behaviors.

Abstract

The study and quantification of UV photon-induced desorption of frozen molecules furthers our understanding of the chemical evolution of cold interstellar regions. Nitric oxide (NO) is an important intermediate species in both gas-phase and solid-phase chemical networks. In this work, we present quantitative measurements of the photodesorption of a pure NO ice.We used the tunable monochromatic synchrotron light of the DESIRS beamline of the SOLEIL facility near Paris to irradiate NO ices in the 6 - 13.6 eV range and measured desorption by quadrupole mass spectrometry.We find that NO photodesorption is very efficient, its yield being around 1e-2 molecule per incident photon for UV fields relevant to the diffuse and dense interstellar medium. We discuss the extrapolation of our results to an astrophysical context and we compare photodesorption of NO to previously studied molecules.