Na2(A 1Σ+u→X 1Σ+g) fluorescence accompanied by a continuous spectrum

A suitably adjusted single-mode line of the krypton ion laser at 5682 Å has been found to excite Na2 to the single level A 1Σ+u(v′ = 34, J′ = 50). Then, a series of resonance fluorescence to different vibrational levels of the ground state X 1Σ+g have been observed up to the point of convergence. A continuous spectrum with banded diffraction structure has been contiguous to it and extended toward the small wave number region. The spectrum has been quantitatively accounted for by quantal calculations.