Table 4: Isotopic substitution displacements of the band centers (in cm^-1) and the B₀ rotational constant (in MHz) for l-SiCCC.
¹³C-C-C-Si C-¹³C-C-Si C-C-¹³C-Si C-C-C-²⁹Si C-C-C-³⁰Si

$\nu_1 (\sigma)$ -10.2 -45.1 -19.2 -0.3 -0.6

$\nu_2 (\sigma)$ -22.2 -2.3 -26.6 -0.7 -1.3

$\nu_3 (\sigma)$ -6.5 -4.3 -0.9 -5.4 -10.6

$\nu_4 (\pi)$ -1.1 -8.8 -5.4 0.0 0.0

$\nu_5 (\pi)$ -1.8 -0.9 -2.9 -0.4 -0.7

B₀ -95 -24.8 0.0 -40.9 -79.5

**Table 4:** Isotopic substitution displacements of the band centers (in cm^-1) and the B₀ rotational constant (in MHz) for l-SiCCC.
	¹³C-C-C-Si	C-¹³C-C-Si	C-C-¹³C-Si	C-C-C-²⁹Si	C-C-C-³⁰Si
$\nu_1 (\sigma)$	-10.2	-45.1	-19.2	-0.3	-0.6
$\nu_2 (\sigma)$	-22.2	-2.3	-26.6	-0.7	-1.3
$\nu_3 (\sigma)$	-6.5	-4.3	-0.9	-5.4	-10.6
$\nu_4 (\pi)$	-1.1	-8.8	-5.4	0.0	0.0
$\nu_5 (\pi)$	-1.8	-0.9	-2.9	-0.4	-0.7
B₀	-95	-24.8	0.0	-40.9	-79.5

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