Extreme-ultraviolet laser metrology of OI transitions
Lange, C.A. de
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Some 16 transitions in atomic oxygen originating from its P-3 ground state were measured using a tunable narrow-band extreme-ultraviolet laser source, with an unprecedented accuracy of Delta lambda/lambda= 8 x 10(-8). The results are relevant for comparisons with spectral absorption features observed in the line of sight of quasars, in order to test a possible variation of the fine-structure constant alpha on a cosmological time-scale.