Table 2. Vibrational band assignments for the IR bands with optical depth higher than 0.0025.

ν	λ	Assignment	Intensity
cm−1	µm
3322	3.01	sp alkyne CH str.	sh
3300	3.03	sp alkyne CH str.	s
3100	3.23	sp2 arom./olef. CH str.	sh
3085	3.24	sp2 arom./olef. CH str.	sh
3056	3.27	sp2 arom./olef. CH str.	m
3029	3.30	sp2 arom./olef. CH str.	m
2973	3.36	sp3 asym. CH3 str.	m-s
2925	3.42	sp3 asym. CH2 str.	s
2870	3.48	sp3 sym. CH3 str.	sh
2845	3.51	sp3 sym. CH2 str.	sh
2200	4.55	sp alkyne CC str. (conjugated alkynes)	w
2105	4.75	sp alkyne CC str	w
1938	5.16	Combination of out-of-plane and in-plane CH bend. modes	w
1800-1000	5.56-10.00	Amorphous carbon (π-band)	m-s
1711	5.84	Carbonyl CO str.	w
1686	5.93	Carbonyl CO str.	w
1630	6.13	sp2 olef. CC str.	sh
1600	6.25	sp2 arom. CC str.	m-s
1578	6.34	sp2 arom. CC str.	sh
1492	6.70	sp2 arom. CC str.	w
1445	6.92	sp3 CH3 asym. bend. / sp3 CH2 sci.	m-s
1437	6.96	sp2 arom. CC str	sh
1379	7.25	sp3 CH3 sym. bend.	sh
1369	7.30	sp3 CH3 sym. bend.	w-m
1074	9.31	sp2 arom. CH in-plane bend. / sp2 olef. CH2 rock.	w
1029	9.72	sp2 arom. CH in-plane bend.	w
988	10.12	sp2 olef. CH wag.	w
968	10.33	sp3 CH3 rock.	w
910	10.99	sp2 olef. CH wag.	sh
890	11.24	sp2 arom. CH out-of-plane bend. (solo)	m
843	11.86	sp2 arom. CH out-of-plane bend. (duo)	m
776	12.89	sp2 arom. CH out-of-plane bend. (trio)	sh
756	13.23	sp2 arom. CH out-of-plane bend. (quartet)	m-s
700	14.29	sp2 CH out-of-plane bend.	m
640	15.63	sp2 arom. CCC in-plane bend.	m

Note—arom: aromatics; olef: olefins. The vibrational modes are abbreviated as str: stretching; bend: bending; sci: scissoring; rock: rocking; wag: wagging. Relative intensities are labelled as s: strong; m: medium; w: weak; sh: shoulder.