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X-ray photodesorption yields of $^{15}$N$_2$ and $^{13}$CO are derived as afunction of the incident photon energy near the N ($\sim$400 eV) and O K-edge($\sim$500 eV) for pure $^{15}$N$_2$ ice and mixed $^{13}$CO:$^{15}$N$_2$ ices.The photodesorption spectra from the mixed ices reveal an indirect desorptionmechanism for which the desorption of $^{15}$N$_2$ and $^{13}$CO is triggeredby the photo-absorption of respectively $^{13}$CO and $^{15}$N$_2$. Thismechanism is confirmed by the X-ray photodesorption of $^{13}$CO from a layered$^{13}$CO/$^{15}$N$_2$ ice irradiated at 401 eV, on the N 1s$\rightarrow \pi^*$transition of $^{15}$N$_2$. This latter experiment enables to quantify therelevant depth involved in the indirect desorption process, which is found tobe 30 - 40 ML in that case. This value is further related to the energytransport of Auger electrons emitted from the photo-absorbing $^{15}$N$_2$molecules that scatter towards the ice surface, inducing the desorption of$^{13}$CO. The photodesorption yields corrected from the energy that canparticipate to the desorption process (expressed in molecules desorbed by eVdeposited) do not depend on the photon energy hence neither on thephoto-absorbing molecule nor on its state after Auger decay. This demonstratesthat X-ray induced electron stimulated desorption (XESD), mediated by Augerscattering, is the dominant process explaining the desorption of $^{15}$N$_2$and $^{13}$CO from the ices studied in this work.

Indirect X-ray photodesorption of 15N2 and 13CO from mixed and layered ices