Abstract
Fast N( 2D) atoms colliding with CH 4 at 10–200 eV CM yield CH(A,B), NH(A) and H( n⩾4) emission. From 10 to 50 eV CM the CH yield decreases, exceeding greatly that for N( 4S) and N +( 3P) + CH 4 collisions. This indicates N( 2D) insertion. Above 50 eV CM the CH yield increases again, approaching the values found with N( 4S) and N +( 3P). Here the CH formation is chemically unspecific (‘shattering’). The NH(A) yield decreases monotonically for all three projectiles. N( 2D) insertion is here unimportant, in contrast to NH(X) from N( 2D) + CH 4. At E CM>50 eV CM, all projectiles give NH(A) according to the ‘billiard ball’ model.
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