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We have measured the wavelength of the intercombination line 3P1-1S0 of 40Ca. The wavelength of a dye laser, stabilized to the intercombination line 3P1-1S0 of 40Ca, was compared with the wavelength of an I2-stabilized He–Ne laser by means of a newly developed wavemeter. The estimated uncertainty of the measured wavelength ratio is 7×10-11 (3σ) and the measured wavelength agrees with the previous results within the uncertainty of the I2-stabilized He–Ne laser.
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Ishikawa et al. (1994) studied this question.
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