Simple cell for microscale capillary solution and supercritical fluid Raman spectroscopy

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Abstract
A microscale capillary Raman solution flow cell has been developed utilizing conventional high‐performance liquid chromatographic capillary tubing. This cell is suitable for both liquids and gases over a wide range of pressures. The introduction of a liquid flow along the capillary allows the collection of Raman spectra of intensely coloured and highly absorbing solutions, e.g. I2CCl4, using 514.5 nm excitation. The application of this cell to the examination of supercritical fluids is demonstrated. The use of small cross‐section capillary tubing (ca 10−5 cm2) allows high linear flow‐rates to be maintained with comparatively small solution volumes.