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Extinction of dilute buffer measured at (●) is in good quantitative agreement with both literature values (Ref. 15, ◻; Ref. 16, 엯; Ref. 17, ▿; and Ref. 18, ◇) and modern double Debye models (“Double Debye 1,” Ref. 32 solid line; “Double Debye 2,” Ref. 29 dotted line) of terahertz extinction of de-ionized water. A single Debye model (Ref. 32, dotted line) is displayed for comparison. Theoretical models (Refs. 29 and 32) are evaluated at , and experimental data (Refs. 15–18) were collected at room temperature.
Absorption of concentrated NaCl solution (-엯-, ) appears to diverge slightly from that of water [-●-, displayed here are measurements for solution, which are experimentally indistinguishable from those of de-ionized water (Refs. 15–18)] at frequencies above . We scale the water spectrum by the remaining water concentration in NaCl solution to obtain the corresponding solvent base line (-▵-) and to subsequently extract a measure of the molar extinction for the aqueous salt.
Molar extinctions of both NaCl (-●-) and GuHCl (-엯-) are approximately two orders of magnitude lower than those previously reported for aqueous NaCl (Ref. 28, solid line, original values are reported for amplitude absorption, and they have been scaled by a factor of 2 here to obtain corresponding intensity absorption).
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