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Relaxation wavelength decrement values for various ions in water

Cation δλ- (2) x 10-4m Anion <δλ- (2) x 10-4
H+ +4 OH- -2
Li+ -3 Cl- -4
Na+ -4 F- -4
K+ -4 SO42- -11
Mg2+ -4 I- -15
Pethig pg. 142