) wishes to acknowledge the en- couragment of Professor J. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 1 . . . . . . . . . . . Direct Liquid Introduction Interfaces . . . . . . . . . . 5 . . Introduction . Operating Principles . Specific DLI Interfaces . Capillary Inlets . Diaphragm Interfaces . Nebulizing Interfaces .