Table 3: Perturbatively computed fundamentals of l-SiCCC. All values are in cm^-1.
CASSCF/cc-pVDZ^a CASSCF/cc-pVTZ^b

$\nu_1 (\sigma)$ 2034 2024

$\nu_2 (\sigma)$ 1344 1352

$\nu_3 (\sigma)$ 601 611

$\nu_4 (\pi)$ 422 434

$\nu_5 (\pi)$ 160 169

^a Derived from our 6D-PESs;
^b Estimations. See text for more details.

**Table 3:** Perturbatively computed fundamentals of l-SiCCC. All values are in cm^-1.
	CASSCF/cc-pVDZ^a	CASSCF/cc-pVTZ^b
$\nu_1 (\sigma)$	2034	2024
$\nu_2 (\sigma)$	1344	1352
$\nu_3 (\sigma)$	601	611
$\nu_4 (\pi)$	422	434
$\nu_5 (\pi)$	160	169

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