Table 4. Raman Shift Values in the SEHRS and SERS Spectra of Thymine with Hydroxylamine (AgHA) and Citrate (AgCit) Reduced Silver Nanoparticles and Assignment to Vibrations of the Thymine Molecule (Based on References (35) and (12)).

Raman shift/cm–1a
SEHRS		SERS
AgHA	AgCit	AgHA	AgCit	plane	assignmentsb
1652 m	1649 s	1647 vs	1649 s	in	str C2=O, C4=O12,35
1600 vs	1601 vs	1604 m	1605 m	in	str C2=O, C4=O12
1522 m		1521 m	1520 vw	in	ring str12
1456 vw	1477 s	1450 vw		in	bend CH312
1401 m	1397 vs	1400 s	1396 vs	in	bend N1–H, N3–H35
1347 m	1352 s	1350 vs	1351 s	in	bend CH3, def C6–H12,35
1289 m	1279 w	1282 m	1280 m	in	ring str12,35
1217 m	1220 m	1219 s	1221 m	in	str C5–C935
1043 br	1034 br	1031 vw	1034 vw	out	wag CH335
		998 m	1000 w	out	wag N1–H, N3–H35
821 w	820 w			in	ring def12,35
776 w	775 w	785 vs	786 s	in	ring breath12,35
650 br		630 w		in	C2=O, C4=O def35
589 w	590 w	587 m	584 m	in	ring def35
	556 m			in	ring def12
502 m	501 m	502 m	498 w	in	ring def12,35
452 m	444 m	446 w	439 w	out	ring def35

^avs, very strong; s, strong; m, medium; w, weak; vw, very weak; br, broad.

^bBend, bending; breath, breathing; def, deformation; str, stretching; wag, wagging.