Wave numbers and pressure-induced shifts of Ar I atomic lines measured by Fourier transform spectroscopy
D. Veza, Craig J. Sansonetti, Marc L. Salit, John C. Travis
Wave numbers and pressure-induced shifts of 19 argon emission lines were measured with high accuracy using a UV/visible Fourier transform spectrometer (FTS). The measurements were made using electrodeless lamps containing traces of 198Hg and argon at pressures of 33 Pa (1/4 Torr), 400 Pa (3 Torr), 933 Pa (7 Torr) and 1333 Pa (10 Torr). Calibration of the FTS wave number scale was obtained using the four most prominent lines of 198Hg as internal standards. The pressure induced shifts of the argon emission lines are in reasonable agreement with theoretical predictions. These results are of importance for astronomers and analytical chemists who use argon lines for practical wavelength standards as well as for theoreticians calculating argon-argon interactions and potential energy curves of diatomic argon molecules.
Journal of Physics B-Atomic Molecular and Optical Physics
, Sansonetti, C.
, Salit, M.
and Travis, J.
Wave numbers and pressure-induced shifts of Ar I atomic lines measured by Fourier transform spectroscopy, Journal of Physics B-Atomic Molecular and Optical Physics, [online], https://doi.org/10.1103/PhysRevA.85.042501
(Accessed September 26, 2023)