Signature of [SiPAH]+ π-complexes in the interstellar medium

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Volume 494 / No 3 (February II 2009)

A&A, 494 3 (2009) 969-976

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Table 3:

$I_{6-10~\mu {\rm m}}/I_{10-15~\mu {\rm m}}$ ratios (R) for the ground states of PAH⁺ and their complexes with Si and the effects of the complexation on this ratio.
		R(SiPAH⁺)/		$\delta$ $\lambda$ oop C-H bend^*		$\delta$ $\lambda$ ip C-C stretch^*
	R	R(PAH⁺)	$\lambda$ oop C-H bend	SiPAH⁺ vs. PAH⁺	$\lambda$ ip C-C stretch^*	SiPAH⁺ vs. PAH^+*
C₁₀H₈⁺	2.92		13.28		6.60 (6.55)
[SiC₁₀H₈]⁺	0.97	0.33	13.19	-0.09	6.43	-0.17
			12.02	new
C₁₆H₁₀⁺	2.86		11.46		6.47
[SiC₁₆H₁₀]⁺ (1)	3.56	1.24	11.68	+0.22	6.22	-0.25
			11.15	-0.31; new
[SiC₁₆H₁₀]⁺ (2)	1.58	0.55	11.85	+0.37	6.18	-0.29
C₂₄H₁₂⁺	5.24		11.41		6.38
[SiC₂₄H₁₂]⁺	2.87	0.55	11.48	+0.07	6.21	-0.17
			11.32	-0.09; new
C₃₂H₁₄⁺	7.27		11.11		6.23
[SiC₃₂H₁₄]⁺ (1)	5.01	0.69	11.03	-0.08	6.13	-0.10
[SiC₃₂H₁₄]⁺ (2)	6.63	0.91	11.49	+0.38	6.11	-0.12
			10.79	-0.33; new
[SiC₃₂H₁₄]⁺ (3)	5.34	0.73	11.15	+0.04	6.13	-0.10
			10.95	-0.16; new

^* All values are expressed in $\mu$ m.

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