Wave numbers and pressure-induced shifts of Ar I atomic lines measured by Fourier transform spectroscopy

Published

May 18, 2012

Author(s)

D. Veza, Craig J. Sansonetti, Marc L. Salit, John C. Travis

Abstract

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.

Citation

Journal of Physics B-Atomic Molecular and Optical Physics

Volume

45

Issue

11

Pub Type

Journals

Download Paper

https://doi.org/10.1103/PhysRevA.85.042501

Local Download

Keywords

Ar, atomic wavelengths, cross sections, experimental pressure shifts, Fourier transform spectroscopy

Citation

Veza, D. , Sansonetti, C. , Salit, M. and Travis, J. (2012), 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, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=910249 (Accessed October 16, 2025)