TABLE I.

Vibrational modes of the DNA backbone. The diagonal anharmonicity Δ and the FFCF parameters are derived from the analysis of the linear and 2D infrared spectra. The FFCF consists of two Kubo terms with amplitudes $\Delta {\nu }_1$ and $\Delta {\nu }_2$ and decay times ${\tau }_1=0.3$ ps and ${\tau }_2=50$ ps.

Mode	Character	Frequency ν01 (92%/0% r.h.) (cm−1)	Anharmonicity Δ (92%/0% r.h.) (cm−1)	FFCF $\Delta {\nu }_1$ (92%/0% r.h.) (cm−1)	$\Delta {\nu }_2$ (92%/0% r.h.) (cm−1)
${\nu }_{P2}$	Sym. phosphate stretch	1092/1096	8/7	8/4	7/9
${\nu }_{L1}$	Diester linkage	1071/1068	10/14	7/3	7/11
${\nu }_{L2}$	Diester linkage	1052/1038	10/16	8/4	9/12
${\nu }_{R1}$	Furanose ring	1016/1009	10/6	9/5	12/6
${\nu }_{R2}$	Ribose main chain	976/972	7/8	7/5	7/8
${\nu }_{L3}$	Diester linkage	962/957	7/9	6/5	6/8