Spelman College

Sheena T Patrick

Dean R Guyer

Candace C Joyner

Peter Chen

A multiplex coherent Raman spectrometer ( ) and spectroscopy method rapidly detects and identifies individual components of a chemical mixture separated by a separation technique, such as gas chromatography. The spectrometer ( ) and method accurately identify a variety of compounds because they produce the entire gas phase vibrational Raman spectrum of the unknown gas. This is accomplished by tilting a Raman cell ( ) to produce a high-intensity, backward-stimulated, coherent Raman beam of 683 nm, which drives a degenerate optical parametric oscillator ( ) to produce a broadband beam of 1100-1700 nm covering a range of more than 3000 wavenumber. This broadband beam is combined with a narrowband beam of 532 nm having a bandwidth of 0.003 wavenumbers and focused into a heated windowless cell ( ) that receives gases separated by a gas chromatograph ( ). The Raman radiation scattered from these gases is filtered and sent to a monochromator ( ) with multichannel detection.

Growing community of inventors

Durham, NC, United States of America

Sheena T Patrick