The laser-induced fluorescence (LIF) spectra for C
2 Swan system (d
3πg-a
3πu) were observed with an Ar
+ laser. Two laser lines of 472.7 and 514.5nm coincided with two ro-vibronic transitions:
R(4) (
Ω=2-2, =1-0) and
Q(21) (
Ω=2-2,
v=0-0). The analysis yielded the vibrational parameters for the a
3πu electronic state. The observed LIF spectra could not be explained using the known parameters for the d
3πg electronic state. The parameters for the d
3πg state were redetermined through the reanalysis of the emission spectra for C
2 Swan system. The obtained parameters well explained the LIF spectra.
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