Table 1.

Principal FT-IR bands of PCDDs. Reprinted with permission from [19], copyright 2014.

PCDD Congener	Mode	Frequency Range (1020–1205 and 1265–1510 cm−1) GC/MI/FT-IR [33]	Frequency Range (1020–1205 and 1265–1510 cm−1) Vapor-Phase FT-IR [34]	Frequency Range (1020–1205 and 1265–1510 cm−1) Condensed-Phase FT-IR [19]
dibenzo-p-dioxin	C=C aromatic ring skeletal vibrations		1489	1489
			1390
	C-O-C asymmetric stretch			1295
			1290	1287
	C-C-C tri-ring bending			1197
			1117
	Ring breathing		1026	1112
				1030
2,3,7,8-TCDD	C=C aromatic ring skeletal vibrations	1495
		1488	1489	1484
		1470	1465	1465
			1391	1395
	C-O-C asymmetric stretch	1330	1321	1326
		1313
		1306	1306	1306
	C-C-C tri-ring bending	1176	1173	1173
	Ring breathing	1117	1114	1114
		1106	1103	1103
1,2,3,7,8-PeCDD	C=C aromatic ring skeletal vibrations	1493		1489
		1475	1471	1470
		1465	1447	1449
		1399	1394	1395
	C-O-C asymmetric stretch	1319		1328
		1313	1311	1314
				1308
	Ring breathing	1113	1108	1111
1,2,3,7,8,9-HxCDD	C=C aromatic ring skeletal vibrations		1480
		1452	1445	1446
		1400	1391	1396
	C-O-C asymmetric stretch	1333		1328
		1314	1312	1309
			1308
			1304
	C-C-C tri-ring bending			1155
		1147		1143
1,2,3,6,7,8-HxCDD	C=C aromatic ring skeletal vibrations	1481
		1455	1445	1448
		1400	1392	1395
	C-O-C asymmetric stretch	1333		1328
		1318	1310	1312
	C-C-C tri-ring bending			1150
		1147		1143
1,2,3,4,6,7,8-HpCDD	C=C aromatic ring skeletal vibrations	1480
		1457	1451	1452
				1447
		1434	1422	1428
		1403	1392	1398
	C-O-C asymmetric stretch	1334		1329
			1297	1299
	C-C-C tri-ring bending	1148		1153
				1144
OCDD	C=C aromatic ring skeletal vibrations			1436
			1424	1429
				1419
				1402
				1399