Vacuum ultraviolet absorption spectroscopy system and method
An efficient absorption spectroscopy system is provided. The spectroscopy system may be configured to measure solid, liquid or gaseous samples. Vacuum ultra-violet wavelengths may be utilized. Some of the disclosed techniques can be used for detecting the presence of trace concentrations of gaseous species. A preferable gas flow cell is disclosed. Some of the disclosed techniques may be used with a gas chromatography system so as to detect and identify species eluted from the column. Some of the disclosed techniques may be used in conjunction with an electrospray interface and a liquid chromatography system so as to detect and identify gas phase ions of macromolecules produced from solution. Some of the disclosed techniques may be used to characterize chemical reactions. Some of the disclosed techniques may be used in conjunction with an ultra short-path length sample cell to measure liquids.
1. A liquid chromatography analysis system, comprising:
a liquid chromatography column, the liquid chromatography column configured to provide at least one analyte to be analyzed;
a flow cell coupled to the liquid chromatography column, the flow cell configured to receive a flow of the analyte from the liquid chromatography column;
a light source configured to provide at least VUV wavelengths or less of light to the flow cell, the flow cell further configured to facilitate a partial transmission of at least VUV wavelengths or less of light through the flow of the analyte;
a detector configured to detect the at least VUV wavelengths or less of light transmitted through the flow of the analyte, the detector capable of detecting multiple wavelengths simultaneously as a function of time; and
a light path from the light source to the detector being contained within one or more controlled environments.
2. The system of claim 1 , wherein transmission of at least VUV wavelengths or less of light through the flow cell is achieved by employing an ultra-short path-length flow cell, the ultra-short path-length flow cell rendering the flow of analyte semi-transparent to the VUV light.
3. The system of claim 2 , wherein a cross-sectional area of the ultra-short path-length flow cell is maintained along a flow direction axis to promote laminar flow.
4. The system of claim 2 , wherein a collimated beam of light is transmitted through the flow cell.
5. The system of claim 2 , wherein a focused beam of light is transmitted through the flow cell.
6. The system of claim 1 , wherein transmission of at least VUV wavelengths or less of light through the flow cell is achieved by at least partially de-solvating the flow of analyte from the liquid chromatography column.
7. The system of claim 6 , wherein the at least partial de-solvation of the flow of analyte from the liquid chromatography column is accomplished at least partially using electrospray techniques.
8. The system of claim 6 , wherein the at least partial de-solvation of the flow of analyte from the liquid chromatography column is accomplished at least partially using nebulization techniques.
9. The system of claim 6 , wherein the at least partial de-solvation of the flow of analyte from the liquid chromatography column is accomplished at least partially using evaporative techniques.
10. The system of claim 1 , wherein a collimated beam of light is transmitted through the flow cell.
11. The system of claim 1 , wherein a focused beam of light is transmitted through the flow cell.