Mid-infrared spectroscopy of UV irradiated hydrogenated amorphous carbon materials

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Volume 544 (August 2012)

A&A, 544 (2012) A107

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Table 1

Gaussian fitting of the spectra of HAC materials (S26) before and after UV irradiation.

P_non^+,*	W_non	S_non	A_non	P_UV^*	W_UV	S_UV	A_UV	ΔP	ΔW	ΔS	ΔA	Assignment^**


in the functional group region
3.04	0.038	259	13	....	....	....	....	....	....	....	....	≡ CH str.^{1, 2}
3.31	0.093	202	21	3.31	0.090	117	12	0.00	0.003	85	8	aro. =CH str.^{1, 2}
3.38	0.035	1206	45	3.37	0.037	198	8	0.01	–0.02	1008	37	ali. CH₃ asy. str.¹
3.42	0.046	1993	98	3.42	0.058	412	26	0.00	–0.012	1581	72	ali. CH₂ asy. str.^1,2
3.49	0.096	945	95	3.48	0.055	279	16	0.01	0.041	666	79	ali. CH₃ sy. str.¹
3.51	0.024	449	12	3.51	0.080	129	11	0.00	–0.056	320	1	ali. CH₂ sy. str.^1,2
....	....	....		5.70	0.128	135	20	....	...	....	....	-C=O str.^{1, 3}
5.80	0.098	320	34	5.84	0.150	548	88	–0.04	–0.052	–228	–54	-C=O str.^{1, 3}
5.96 ± 0.03	0.250	163	42	5.96 ± 0.03	0.211	539	124	0.00	0.039	–376	–82	-C=O str.
6.15 ± 0.02	0.094	75	8	6.12	0.048	106	6	0.03	0.046	–31	2	......................
....	....	....		6.24 ± 0.01	0.184	298	61	...	....	....	....	aro. -C=C str.^{1, 3}
6.27 ± 0.02	0.162	176	34	6.3 ± 0.07	0.312	519	163	–0.03	–0.150	–343	–129	aro. -C=C str.^{1, 3}
6.41 ± 0.32	0.666	83	66	....	....	....	....	....	....	....	....	......................
6.90	0.199	673	148	6.90	0.189	373	75	0.00	0.010	300	73	ali. asy. CH_2,3 ben.³
....	....	....		7.1	0.143	133	20	....	....	....	....	ali. sy. CH₃ ben.³
7.27	0.075	236	19	7.25	0.090	175	17	0.02	–0.015	61	2	ali. sy. CH₃ ben.^{1, 3}
7.36 ± 0.02	0.316	204	72	7.33 ± 0.06	0.143	97	14	0.03	0.173	125	58	......................
....	....	....		7.46 ± 0.73	0.222	116	29	....	....	....	....	......................
7.65 ± 0.03	0.124	88	12	7.65 ± 0.56	0.255	239	66	0.0	–0.131	–151	–54	......................
7.79 ± 0.02	0.169	174	37	7.85 ± 0.11	0.195	154	33	–0.06	–0.026	20	4	-C-C str., CH ben.¹
7.93	0.093	284	28	....	....	....	....	....	....	....	....	-C-O str.³
7.96 ± 0.11	0.463	166	85	....	....	....	....	....	....	....	....	......................


in the fingerprint region
11.02 ± 0.02	0.420	141	65	11.10 ± 0.07	0.253	130	34	–0.08	0.167	11	31	aro. =CH oop ben.^{5, 6}
....	....	....	....	11.35 ± 0.02	0.337	240	86	....	....	....	....	aro. =CH oop ben.^1,5,6
11.65	0.558	377	237	11.7 ± 0.08	0.458	182	93	–0.05	0.100	195	144	aro. =CH oop ben.^1,5,6
12.17 ± 0.03	0.284	224	70	12.14 ± 0.05	0.379	223	88	0.03	–0.095	1	–18	aro. =CH oop ben.^{5, 6}
12.46 ± 0.01	0.305	424	141	12.36 ± 0.01	0.432	95	21	0.1	–0.127	329	120	aro. =CH oop ben.^{5, 6}
12.9 ± 0.01	0.369	193	76	12.64 ± 0.06	0.431	298	138	0.26	–0.062	–96	–62	aro. =CH oop ben.^{5, 6}
13.23 ± 0.01	0.400	147	62	13.04 ± 0.04	0.421	360	163	0.19	–0.021	–213	–101	aro. =CH oop ben.^{5, 6}
13.67 ± 0.13	0.600	139	90	13.41 ± 0.10	0.485	265	118	0.26	0.115	–126	–28	aro. =CH oop ben.^{5, 6}
....	....	....	....	13.86 ± 0.07	0.253	157	83	....	....	....	....	=CH/-CCC oop ben.⁶
....	....	....	....	14.29 ± 0.01	0.137	82	23	....	....	....	....	=CH/-CCC oop ben.⁶
14.44 ± 0.04	0.495	93	51	....	....	....	....	....	....	....	....	-CCC oop ben.^{5, 6}
....	....	....	....	14.73 ± 0.01	0.232	56	9	....	....	....	....	......................
....	....	....	....	14.93 ± 0.02	0.927	51	13	....	....	....	....	......................
15.4 ± 0.08	0.590	107	68	15.29 ± 0.01	0.137	220	216	0.11	0.453	–113	–148	aro. -CCC ip ben.⁷
15.87 ± 0.02	0.379	191	78	....	....	....	....	....	....	....	....	aro. -CCC ip ben.⁷
16.3 ± 0.04	0.305	79	78	....	....	....	....	....	....	....	....	aro. -CCC ip ben.⁷
16.63 ± 0.02	0.242	117	32	....	....	....	....	....	....	....	....	aro. -CCC ip ben.⁷

Notes.

⁽⁺⁾

In the first row, we list the peak parameters (the position P (μm), width W (μm), strength S (cm²g^-1) and integrated area A) and their changes (ΔP, ΔW, ΔS and ΔA, respectively). The subscripts non and UV refere to the non- and UV-processed samples

^(*)

In the first and fifth columns, we list the errors estimates ( ≥ 0.01 μm) of the band position.

^(**)

In the last column, the abbreviations of aro., ali., str., ben., asy., sy., oop, and ip refer to aromatic, aliphatic, bending, asymetric, symetric, out-of-plane, and in-plane, respectively.

References.

⁽¹⁾

Jäger et al. (2008);

⁽²⁾

Dischler et al. (1983);

⁽³⁾

Grishko & Duley (2002);

⁽⁴⁾

Mckenzie et al. (1983);

⁽⁵⁾

Hudgins & Allamandola (1999);

⁽⁶⁾

Hony et al. (2001);

⁽⁷⁾

Van Kerckhoven et al. (2000).

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