A beam containing NO in the long-lived:a (II)-I-4 state was allowed to interact with target particles in a collision-cell. Intramolecular collision-induced transitions;a (II)-I-4 --> B (II)-I-2 and a (II)-I-4 --> b (4) Sigma(-) were observed via the subsequent emissions in the beta bands (B (II)-I-2 --> X (II)-I-2) and the Ogawa bands (b (4) Sigma(-) --> (II)-I-4), respectively. In the ultraviolet part of the spectrum long beta band progressions originating from the B-state vibrational levels v=0 and 3 were observed. In each band only a few lines appear, which were assigned to transitions from the rotational levels (II3/2)-I-2(10.5) in v=0 and (II1/2)-I-2( 17.5) in v=3. These particular B (II)-I-2 levels are perturbed by specific levels of the a (II)-I-4 state, serving as so-called gateways to allow the otherwise spin-forbidden a (II)-I-4, --> B (II)-I-2 collision-induced transition. An external magnetic field has strong effect on the collision-induced emission from the NO(B, v=0) level. With paramagnetic target gases, direct spin-changing NO(a--> B) collisional transfer was also observed in addition to the gateway transitions. The selectivity for the final state level is much weaker here. The collision-induced Ogawa band emission in the near-infrared showed smooth, partially resolved rotational contours with all target gases. This indicates that the collisional. transfer NO(a-->b) within the quartet system is also not of the highly restrictive gateway:type, but results from direct collisional coupling.