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An infrared measurement of chemical desorption from interstellar ice analogues


In molecular clouds at temperatures as low as 10 K, all species except hydrogen and helium should be locked in the heterogeneous ice on dust grain surfaces. Nevertheless, astronomical observations have detected over 150 different species in the gas phase in these clouds. The mechanism by which molecules are released from the dust surface below thermal desorption temperatures to be detectable in the gas phase is crucial for understanding the chemical evolution in such cold clouds. Chemical desorption, caused by the excess energy of an exothermic reaction, was first proposed as a key molecular release mechanism almost 50 years ago1. Chemical desorption can, in principle, take place at any temperature, even below the thermal desorption temperature. Therefore, astrochemical network models commonly include this process2,3. Although there have been a few previous experimental efforts4,5,6, no infrared measurement of the surface (which has a strong advantage to quantify chemical desorption) has been performed. Here, we report the first infrared in situ measurement of chemical desorption during the reactions H + H2S → HS + H2 (reaction 1) and HS + H → H2S (reaction 2), which are key to interstellar sulphur chemistry2,3. The present study clearly demonstrates that chemical desorption is a more efficient process for releasing H2S into the gas phase than was previously believed. The obtained effective cross-section for chemical desorption indicates that the chemical desorption rate exceeds the photodesorption rate in typical interstellar environments.

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Fig. 1: FTIR spectra of samples.
Fig. 2: Variations in the relative abundance of solid H2S on ASW with relevance to H atom exposure times.
Fig. 3: TPD spectra.
Fig. 4: Difference spectra of solid H2S after exposure to D atoms for varying lengths of time on ASW.


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The authors thank H. Hidaka, T. Hama and J. Kästner for discussions about chemical desorption. This work was partly supported by a Japan Society for the Promotion of Science Grant-in-Aid for Specially Promoted Research (JP17H06087) and Grant-in-Aid for Young Scientists (A) (JP26707030). Computational resources were provided by the state of Baden-Württemberg through bwHPC and the German Research Foundation through grant number INST 40/467-1 FUGG.

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Y.O. planned the experiments in consultation with N.W. and A.K. Y.O. and T.T. performed the experiments. T.L. performed the computational calculations on binding energy. All authors discussed the results. Y.O., T.L. and N.W. wrote the paper.

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Correspondence to Y. Oba.

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Supplementary Figures 1–3, Supplementary Table 1

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Oba, Y., Tomaru, T., Lamberts, T. et al. An infrared measurement of chemical desorption from interstellar ice analogues. Nat Astron 2, 228–232 (2018).

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