# Are there any differences between photons emited /absorbed by antimatter atoms to photon in usual atoms?

(Theoretically)

Are there any differences between photons emited /absorbed by antimatter atoms to photon in usual atoms? for example, is it impossible to tell the difference between a photon emmited by an atom and it's anti matter counter part? Assuming the same orbital transitions for their electorn and positrons?

Are the absorptions lines the same as well? or are there absoption lines for anti hydrogen are expected to be different than the hydrogen?

What is convention for anti elements? e.g is anti matter counter part of He is just denoted as -He or $\bar{He}$?

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