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Accurate laboratory ultraviolet wavelengths for quasar absorption-line constraints on varying fundamental constants

Accurate laboratory ultraviolet wavelengths for quasar absorption-line constraints on varying fundamental constants

The most precise method of investigating possible spaceā€“time variations of the fine-structure constant, Ī±ā‰” (1/ħc)(e2/4Ļ€Īµ0), using high-redshift quasar absorption lines is the many-multiplet (MM) method. For reliable results this method requires very accurate relative laboratory wavelengths for a number of UV resonance transitions from several different ionic species. For this ā€¦