What is Hyper-Raman spectroscopy?
Hyper-Raman spectroscopy enables us to obtain information on molecular structure that cannot be obtained by Infrared absorption nor Raman spectroscopy. Hyper-Raman scattering is an analogue to Raman scattering. In Raman scattering process, one incident photon dissapears and one photon is scattered. In hyper-Raman scattering process, TWO incident photons dissapears and ONE photon is scattered.
Just after the development of lasers, 1965, hyper-Raman measurements of water was conducted by Maker et al. Since then, several very interesting results has been obtained. Howevevr, because hyper-Raman scattering signals are EXTREMELY WEAK (even 10,000 ~ 100, 000 times weaker than Raman signal!), hyper-Raman measurements has been very difficult and the number of researchs using hyper-Raman spectroscopy has been limited.
Infrared, Raman, and hyper-Raman processes
In this lab...
Very recently, hyper-Raman measurements has become possible within reasonable measurement time due to the improvements of lasers and detectors. In this lab, we are developing hyper-Raman spectroscopy to shed new light on molecular science.
- fundamental research on hyper-Raman scattering
- application to hydrgen-bonding systems
- application to biologically-relevant molecules
are the topis we are tackling.
Home-made hyper-Raman spectrometer