But did I make any sense? While we're on the subject of IR. Here is my IR instrument. The Perkin Elmer System 2000 FTIR. Laser guided! Duo detected, single chambered, QCIR usable, and very lonely. =:-( > To the far left ( closest to the viewer is the sample compartment ), then is the optics chamber( laser, mirrors, IR source ), then the computer then the moniter for the whold getup. The white dome shaped thing on top of the sample chamber is the IR mascot, the device behind the IR is a Mass Spectroscope ( determines the atomic masses of molecular ions ). The red signs say DO NOT BREATH INTO SAMPLE COMPARTMENT, and PLEASE KEEP CLEAR. Bsteph