A SIMPLE HIGH-PRESSURE FLOW CELL FOR ONLINE ABSORPTION, RAMAN, AND TIME-RESOLVED LASER-INDUCED FLUORESCENCE SPECTROSCOPY IN SUPERCRITICAL FLUIDS

A versatile spectroscopic flow cell for high pressure liquids and supe rcritical fluid solutions is described. The cell is capable of being c oupled to either standard or liber optic spectrometers. There are two perpendicular optical paths that are adjustable in length and aperture diameter. The cell has shown it can be used for absorption, emission, or scattering spectroscopy. The design is simple, inexpensive, servic eable, uses conventional materials, and is self aligning. With apertur es of 5.7 mm the cell has been tested to pressures up to 500 atm and t emperatures up to 90 degrees C. However, the cell would allow usage at higher temperatures and pressures if desired. (C) 1998 American Insti tute of Physics. [S0034-6748(98)02809-3]