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Article Abstract
Methane in the solid state is often studied in interaction with water, either as clathrate hydrates or as interstellar ice in a water-rich ice environment. Using free-electron laser infrared irradiation, we studied the interaction between CH and HO through energy dissipation after on-resonance vibrational excitation. The observed changes in the ice structure are largely independent of the vibrational mode excited and suggest an energy-dissipation-induced local heating of the ice. Local heating results in desorption for the two pure crystalline phases of CH, a phase transition to phase II for metastable CH and a 1:10 HO:CH mixture, and segregation for the 1:1 and 1:5 HO:CH ice mixtures. Local heating only occurs when the infrared irradiation is on resonance with a vibrational mode of the system in the case of the pure CH ices, suggesting that a sufficient absorption cross section is required to convert the on-resonance vibrational energy into general heating.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC12319911 | PMC |
| http://dx.doi.org/10.1021/acs.jpca.5c03186 | DOI Listing |
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