What is Excimer?

An excimer (originally short for excited dimer) is a short-lived dimeric or heterodimeric molecule formed from two species, at least one of which has completely filled valence shell by electrons (for example, noble gases). In this case, formation of molecules is possible only if such atom is in an electronic excited state. Heteronuclear molecules and molecules that have more than two species are also called exciplex molecules (originally short for excited complex). Excimers are often diatomic and are composed of two atoms or molecules that would not bond if both were in the ground state. The lifetime of an excimer is very short, on the order of nanoseconds. Binding of a larger number of excited atoms form Rydberg matter clusters, the lifetime of which can exceed many seconds.

Questions and answers on "Excimer"

I have white patches on my cheeks due to CO2 laser resurfacing that was not successful. This was 8 years ago, and the skin colour has never...

doctor1 MD


Thanks for your query.

I understand your concern and I wish you had tried some treatment for this laser induced hypopigmentation (white patch)...

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Hi, I had shingles around the eye and head in March this year. I feel fine now but still have a white spot on my upper eyelid which won't go away....

doctor1 MD


Sorry to hear about your problem.

Hypopigmented spots (white spots) can occur following shingles. From your query I understand that...

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I was diagnosed with vitiligo last week. I currently have a few small patches on my neck but expect that it will grow in other areas as well. I am...

doctor1 MD


I have gone through your query and can understand your concerns..

As per your complain Vitiligo is a skin...

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