L shell

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L shell

[¦el ‚shel]
(atomic physics)
The second shell of electrons surrounding the nucleus of an atom, having electrons whose principal quantum number is 2.
References in periodicals archive ?
Based on the first criterion (confirmation of the presence of the alpha and beta L-shell elemental peaks of lead using spectra graphing software), lead peaks were observed for all samples that contained [greater than or equal to]10 ppm (9/9).
TABLE 2 Niton Results for Laboratory Sample Results With >10 Parts per Million (ppm) Lead (Nine Samples) Item Tested Niton Niton Niton Lab L-shell Result Result Result Spectra [greater (ppm) (ppm) Observed than or equal to] 10 ppm Mexican Yes Yes 1.
Todd and Chettle (1994), comparing the K-shell with L-shell precisions with 3 and 6 mm of overlying soft tissue, reported that K-XRF precision worsens by only 5%, whereas L-XRF precision worsens by 49% for greater thickness.
The L-shell is the usual choice for an analytical peak for barium in the conventional beam energy range, but the L-shell is not accessible in the low beam energy range, since the [BaL.