Speaker
Description
In the case of H I spectrum, for large principal quantum numbers n corresponding to the so-called Rydberg states, measurement accuracy becomes increasingly limited by thermal agitation in the mid-infrared region (wave lengths above 10µm), coinciding with the resonance region of molecular vibrational modes.
Starting from the quantum model of the Hydrogen atom, we calculate and tabulate the peaks of α Humphreys-multiplet in fine-structure approximation (fs-appx.) [1,3]. We determine the spectral line peaks of this multiplet using the MaximumLocalisation-spectral-Model (MLmod) which is based on some several spectroscopic and statistical hypotheses [2,3]. By statistical analysis of the NIST and ACE data, we evaluate the parameters of the regression curves for the multiples from Lyman to Pfund and Humphreys spectral series. Furthermore, an algorithm for the quantum spectral reconstruction of multiplets in fs-appx. for any Sn spectral series of H-I is provided, n being the order of the spectral series. A plot representation is used to give a statistical global view of the first six series of H-I spectrum. The results confirm the measurements provided of the solar data from ACE mission [3]. We estimate the line-width of the αHu-multiplet as 2.36Ǻ and calculate the wavelength of the αHu-MLpeak at 123705Ǻ .
Keywords: Humphreys series, astrophysics, solar data, NIST, spectral model, algorithm.
Reference :
[1] A.E. Kramida, A critical compilation of experimental data on spectral lines and energy levels of hydrogen, deuterium, and tritium, Atomic Data and Nuclear Data Tables (2010).
[2] D. R. Constantin, L. Preda, The Estimation of Humphreys Α-Multiplet Spectral Composition for H-I Spectrum Using MaximumLocalisation-Spectral-Model. (2024)
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4744616
[3] https://databace.scisat.ca