Does electromagnetic radiation react with antimatter?

[Sami1999]

And if it does what is the mechanism and can it be used in astronomical spectroscopy?

 

[ZapperZ]

And if it does what is the mechanism and can it be used in astronomical spectroscopy?

The electromagnetic interaction with antimatter is no different than with matter. Positrons behave the same way as electrons, other than the change in sign. Antiprotrons are accelerated the same way at the LHC as protons.

Zz.

 

[Sami1999]

If the interaction is no different then how is the spectrum detected identified to be coming from regular matter not antimatter?

 

[ZapperZ]

If the interaction is no different then how is the spectrum detected identified to be coming from regular matter not antimatter?

The different in SIGN of the charge!

Positron and electron have same mass, but different charge sign.

Proton and antiproton have same mass, but different charge sign.

etc.

Zz.

 

[hilbert2]

If some distant astronomical object were composed of antimatter, I don't think it would be possible to tell that fact by remote observation of the light emitted by it. Until it collides with ordinary matter and releases a huge amount of energy all of sudden. Not sure whether the neutrinos emitted by an antimatter star would be of the opposite kind compared to those released from our Sun, allowing to tell the difference.