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Molecular Physics
An International Journal at the Interface Between Chemistry and Physics
Volume 122, 2024 - Issue 1-2: Special Issue of Molecular Physics in Memory of Prof. Dieter Gerlich
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Festschrift in memory of Dieter Gerlich Special Issue

New measurement of the diffusion of carbon dioxide on non-porous amorphous solid water

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Article: e2176181 | Received 30 Nov 2022, Accepted 13 Jan 2023, Published online: 08 Feb 2023
 

Abstract

The diffusion of molecules on interstellar grain surfaces is one of the most important driving forces for the molecular complexity in the interstellar medium. Due to the lack of laboratory measurements, astrochemical modeling of grain surface processes usually assumes a constant ratio between the diffusion energy barrier and the desorption energy. This over-simplification inevitably causes large uncertainty in model predictions. We present a new measurement of the diffusion of CO2 molecules on the surface of non-porous amorphous solid water (np-ASW), an analog of the ice mantle that covers cosmic dust grains. A small coverage of CO2 was deposited onto an np-ASW surface at 40 K, the subsequent warming of the ice activated the diffusion of CO2 molecules, and a transition from isolated CO2 to CO2 clusters was seen in the infrared spectra. To obtain the diffusion energy barrier and pre-exponential factor simultaneously, a set of isothermal experiments were carried out. The values for the diffusion energy barrier and pre-exponential factor were found to be 1300±110 K and 107.6±0.8 s1. A comparison with prior laboratory measurements on diffusion is discussed.

GRAPHICAL ABSTRACT

Acknowledgments

We dedicate this paper to the memory of Dieter Gerlich, who was a good friend and colleague of some of us.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

We acknowledge the support from the European Research Council under the Horizon 2020 Framework Program via the ERC Advanced Grant Origins 83 24 28, and from NSF Astronomy & Astrophysics Research Grant #1615897.

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