Cavity ringdown spectroscopy of 13C2H2 in the 12 900-13 400 cm−1 region

► Three new combination overtone bands for 13C2H2 observed in the 12 900-13 400 cm−1 region. ► Complete rovibrational analysis performed on two of these bands. ► Combination overtone band with Σ → Σ symmetry tentatively assigned as the ∣0000000〉 → ∣0230000〉 band.