We report a study of the ion-atom reaction H-3(+) + N using a selected
ion flow tube (SIFT) operating at room temperature. The product chann
el is NH2+ + H and the rate coefficient is k = (4.5 +/- 1.8) X 10(-10)
cm(3) s(-1). This reaction is relevant to the synthesis of ammonia in
interstellar clouds.