why does helium have fewer spectral lines than the other noble gases?

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why does helium have fewer spectral lines than the other noble gases?

Jan 31st, 2015

Spectral lines are the result of interaction between a quantum system (usually atoms, but sometimes molecules or atomic nuclei) and a single photon. When a photon has about the right amount of energy to allow a change in the energy state of the system (in the case of an atom this is usually an electron changing orbitals), the photon is absorbed. Then it will be spontaneously re-emitted, either in the same frequency as the original or in a cascade, where the sum of the energies of the photons emitted will be equal to the energy of the one absorbed (assuming the system returns to its original state). The direction and polarization of the new photons will, in general, correlate with those of the original photon.

In other words The spectral lines are the result of the Electrons around the atom. Electrons are directly proportional to the number of protons in an atom. Helium has lesser no. of electron compared to other nobel gas. The more electrons an atom has the more spectral lines it is able to produce.


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Jan 31st, 2015

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