Why don't I see visible helium emission lines in a CO2 laser plasma at low pressure (mixture of He+N2+CO2)?

More Manuela Miclea's questions See All

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Generation Z - what motivates them?

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Digital microscope recommendations ?

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Negative eigenvalues in GNA shell analysis with ABAQUS but solver continues to increase LPF?

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Why do i have a weak plasma and no coating during rf sputtering?

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Question about combustion Kinetics ?

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Why semicircle of nyquist plot is not complete?

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Brett A. Cruden

What is the temperature of your plasma? The excitation energies of He are quite high (about 23 eV) so it is not very common to see their lines.

Javier Luis López

As said Brett is very difficult to excite He because its high excitation energy. You must try to use a very short and high power excitation pulse to excite He.

Manuela Miclea

Thank you very much to Brett and Javier. I think you are right, we excite N2 and CO2 but not He in the CO2 laser plasma.