4.8 Article

Molecular square dancing in CO-CO collisions

期刊

SCIENCE
卷 369, 期 6501, 页码 307-+

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AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aan2729

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资金

  1. Dutch National Science Foundation (NWO) [TOP 715.013.002]
  2. Dutch Astrochemistry Network DANII [648.000.024]
  3. U.S. National Science Foundation (NSF) [CHE-1955239]

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Knowledge of rotational energy transfer (RET) involving carbon monoxide (CO) molecules is crucial for the interpretation of astrophysical data. As of now, our nearly perfect understanding of atom-molecule scattering shows that RET usually occurs by only a simple bump between partners. To advance molecular dynamics to the next step in complexity, we studied molecule-molecule scattering in great detail for collision between two CO molecules. Using advanced imaging methods and quasi-classical and fully quantum theory, we found that a synchronous movement can occur during CO-CO collisions, whereby a bump is followed by a move similar to a do-si-do in square dancing. This resulted in little angular deflection but high RET to both partners, a very unusual combination. The associated conditions suggest that this process can occur in other molecule-molecule systems.

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