Table 2. Fitting Parameters for the l-Proline ATR Spectra.

	ω0 = 1400 cm–1 Γ = 140 cm–1	ω0 = 1608 cm–1 Γ = 40 cm–1	ω0 = 1720 cm–1 Γ = 45 cm–1
pH	peak area	peak area	peak area
7	8.3 ± 0.7	36.8 ± 0.2
5	8.1 ± 0.6	36 ± 0.2
3.9	8.8 ± 0.7	33.8 ± 0.2	1.5 ± 0.3
2.9	8.9 ± 0.5	27 ± 0.2	4.6 ± 0.2
2.2	8.7 ± 0.4	17.6 ± 0.1	9.1 ± 0.2
1.8	7.9 ± 0.4	13 ± 0.1	11.4 ± 0.1
1.5	7.4 ± 0.3	8.4 ± 0.1	14.5 ± 0.1
0.9	7.0 ± 0.4	0.06 ± 0.08	17.7 ± 0.3