Laser-induced fluorescence (LIF) excitation spectra of the SiH2(A) over tilde (1,0,0) - and (A) over tilde (1,1,0)-(X) over tilde (0,0,0) bands, and dispersed fluorescence (DF) spectra from the A (1,0,0) and (1, 1,0) levels were measured in the supersonic-free jet. From the rotational structures of the excitation spectra, the rotational constants in (A) over tilde (1,v(2),0), v(2) = 0similar to2, were determined. The fluorescence decay profiles of the single ro-vibronic levels were also measured, and the fluorescence lifetimes were determined. Based on the lifetimes, it was found that the predissociation depending on the vibronic level starts between the (A) over tilde (1,4,0) and (1,5,0) levels, and the predissociation depending on the rotational level in the (A) over tilde state is suppressed by the v, mode excitation and is promoted by the v(2) mode. The latter one is qualitatively explained by considering a second-order predissociation mechanism and a rotation-vibration constant, alpha(t)(A). (C) 2002 Elsevier Science B.V. All rights reserved.