Conclusions
The lines of the near infrared region of the spectrum of Kr86 can be successfully used for interference measurements of length, especially for difference rates exceeding 500 mm in cases when measurements by means of visible lines of the spectrum become difficult or altogether impossible.
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Efremov, Y.P. Measurements of half-widths of spectral lines by means of a Fabry-Perot interferometer with photoelectric recording. Meas Tech 2, 756–760 (1959). https://doi.org/10.1007/BF00974230
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DOI: https://doi.org/10.1007/BF00974230