In CurlySMILES, antimatter atoms and nuclei are encoded by presenting them in atomic node code (ANC) or square-bracket code (SQC) notation followed by the SSAM annotation {an}. The following table shows notations for antimatter atoms and nuclei that have been observed in heavy ion collider experiments:
antiproton [H+]{an}
antideuteron [2H+]{an}
antitriton [3H+]{an}
antihydrogen atom [H]{an}
antihelium-3 atom [3He]{an}
antihelium-4 atom [4He]{an}
antihelium-3 nucleus [3He+2]{an}
antihelium-4 nucleus (anti-α) [4He+2]{an}
Notice that {an} annotates the total encoded structure, such that anti-dihydrogen is encoded as [H][H]{an}, using just one annotation at the end of the SMILES notation.

Find or enter interesting antimatter links at Materials Matter! For example, check out antihelium-3 and antihelium-4.
_ __ __ submit to reddit __

__ Share on Tumblr ___ bookmark this page


[1] The STAR Collaboration: Observation of the antimatter helium-4 nucleus. Nature 2011, 473 (7347), 353-356.
doi: 10.1038/nature10079.
[2] A. Drefahl: CurlySMILES: a chemical language to customize and annotate encodings of molecular and nanodevice structures. J. Cheminf. 2011, 3:1; doi: 10.1186/1758-2946-3-1.

Custom Search