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词汇 parahelium
释义

Definition of parahelium in English:

parahelium

(also parhelium)
noun ˌparəˈhiːlɪəm

  • The form of helium whose spectrum does not exhibit the fine structure of triplets present in the spectrum of orthohelium, owing to the spins of the two orbital electrons being antiparallel.

Origin

Late 19th century. From para- + helium.

Definition of parahelium in US English:

parahelium

(also parhelium)
nounˌparəˈhiːlɪəm

  • The form of helium whose spectrum does not exhibit the fine structure of triplets present in the spectrum of orthohelium, owing to the spins of the two orbital electrons being antiparallel.

Origin

Late 19th century. From para- + helium.
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